Method for mounting an injection pump on an internal combustion engine

A plug-in pump, which is controlled by a beveled edge, is inserted in a pump installation bore of the internal combustion engine with the aid of an adjusting arrangement and ensures a uniform feed quantity in all plug-in pumps of an engine without subsequent feed quantity adjustment. When the feed quantity adjusting element is fixed in the testing position, the plug-in pump, which is inserted in the test base, is rotated until the feed quantity corresponds to the desired feed quantity and a positioning peg of the adjusting arrangement, which is supported in the flange of the plug-in pump and received by a recess in the test base, is adjusted and fixed in this rotational position. When the control rod of the engine is blocked in the basic testing position, a positioning groove (33) of an adjusting plate (32) of the adjusting arrangement is put into a corresponding rotational position by means of a pump dummy.

BACKGROUND OF THE INVENTION 
The present invention relates to a method, for mounting an injection pump 
on an internal combustion engine and also to a multiple-cylinder and 
single cylinder internal combustion engine with plug-in pumps which are 
mounted in accordance with the method according to the invention. 
Single-cylinder plug-in fuel injection pumps, called plug-in pumps for the 
sake of brevity, are always used to advantage when the expense for a 
single row or distributor injection pump in engines with low cylinder 
output (approximately 2 to 30 KW/cyl.) is too great and when the injection 
pumps are to be mounted as close as possible to the injection nozzle of 
the respective engine cylinder because of the use of shorter compression 
lines and the improved injection conditions which can be achieved 
accordingly. Plug-in pumps do not have their own drive, but are driven by 
a camshaft belonging to the engine. The injection rate is regulated by way 
of a control rod of the engine which, like the feed quantity adjusting 
element of the plug-in pump, lies beneath the respective fastening flange 
within the pump installation bore of the internal combustion engine. 
Pumps of this constructional type are known, for example, from the firm 
Robert Bosch GmbH, Stuttgart, by the designation PF 1Q . . . and PFR 1K . 
. . (e.g., see the publication "Injection Equipment for Diesel Engines 
with PF Injection Pumps"; VDT-UBP 001/6 by Robert Bosch GmbH, Stuttgart), 
and before being mounted on the internal combustion engine each of these 
pumps is adjusted to a desired feed quantity, which is the same for all 
pumps of the same series, on a test bench accompanied by the use of a test 
base and is inserted and fastened in the respective pump installation bore 
of the internal combustion engine with the assistance of an adjusting 
arrangement. Since the adjusting arrangement,which is provided with a 
positioning peg, only fixes the aforementioned pumps in their mounting 
position at the pump installation bore, the engine must be accurately 
adjusted again on the test stand with respect to the feed quantities of 
the individual plug-in pumps in a very costly manner. In so doing, 
adjustable coupling parts of the control rod belonging to the engine must 
be coupled with and adjusted to the feed quantity adjusting elements of 
the plug-in pumps. This testing process must be performed again when 
replacing an individual pump. 
A method of the type according to the generic part of the claim is known 
from EP-ES No. 0 090 226 which avoids the disadvantages referred to and 
which guarantees a feed rate which is the same for all plug-in pumps of an 
internal combustion engine when the plug-in pumps are installed in the 
internal combustion engine. Thus, for the first time, with desired feed 
quantities guaranteed by the injection pump manufacturer, this method 
ensures a uniform feed to all plug-in pumps in multiple-cylinder internal 
combustion engines, also without subsequent adjustment of the engine. The 
control rod belonging to the engine can be constructed as a simple stamped 
sheet metal part with fixed counter-coupling parts for the coupling parts 
of the feed quantity adjusting elements of the plug-in pumps and the 
internal combustion engine also no longer needs a viewing window for 
readjusting the control rod. Also, the engine need no longer be put on the 
test stand in order to adjust the required engine output, which is 
especially advantageous in an integrated drive, since, for instance, there 
is no longer any possibility of adjusting the engine with respect to its 
output along in a unit which is mounted in a fixed manner on the engine 
crankshaft. The substantial characteristic features of this method consist 
in that a first adjusting aid of an adjusting arrangement, e.g. a 
benchmark, is arranged at the fastening flange of the plug-in pump before 
the plug-in pump is mounted by means of an apparatus located on the test 
base and a second adjusting aid, e.g. also a benchmark, of the adjusting 
arrangement at the pump installation bore of the internal combustion 
engine is arranged in each instance in a position assigned to the basic 
testing position of the feed quantity adjusting element at the internal 
combustion engine by means of a pump dummy when the control rod belonging 
to the engine is blocked in the basic testing position. When the plug-in 
pump is inserted in the pump installation bore the two adjusting means are 
then made to overlap each other. The adjusting means used and indicated in 
the known method, e.g. benchmarks or hole and pin plug-in connections, are 
immovably fixed after being attached and can no longer be corrected. In 
the event of an unintentional faulty adjustment or in case of repairs to 
some structural component part, this leads to costly subsequent work or 
the necessity of exchanging important structural component parts. 
SUMMARY OF THE INVENTION 
The invention has the object of improving the known method for mounting the 
plug-in pumps and the respective adjusting arrangement, as well as the 
internal combustion engine, in such a way that the method is completely 
independent from the ability of the skilled workman mounting the plug-in 
pump and can also be carried out in a fully automatic manner by means of 
robots when the piece numbers call for this. Moreover, in the case of 
faulty adjustments or repairs, it is possible to apply the required 
adjusting means as often as desired without costly subsequent work by 
means of simple readjustment. 
This and other objects of the invention are attained by a method of 
mounting a single-cylinder plug-in fuel injection pump on an internal 
combustion engine, wherein prior to mounting the plug-in pump, during the 
rotation of the plug-in pump which is effected for the purpose of 
adjusting the feed quantity, a positioning peg of an adjusting pin is held 
in said test base by means of a recess receiving said positioning peg, 
said adjusting pin being displaceably supported in said fastening flange, 
and said positioning peg serving as said first adjusting aid of said 
adjusting arrangement and being directed toward the flange surface 
at said pump installation bore and, after the feed quantity is adjusted, 
said adjusting pin is secured in the position then occupied by it; wherein 
a positioning groove in an adjusting plate arranged on said flange surface 
of said pump installation bore, which positioning groove serves as said 
second adjusting aid and is provided for receiving said positioning peg, 
is brought into the position assigned to the basic testing position of 
said feed quantity adjusting element by means of said pump dummy, which is 
inserted in said pump installation bore and, with a coupling part which is 
fixed in position, is introduced into a corresponding counter-coupling 
part of the control rod belonging to the engine, and is fixed in this 
position by means of fastening said adjusting plate to said flange surface 
so as to be detachable; and wherein said feed quantity adjusting element 
is coupled with said control rod belonging to the engine when said plug-in 
pump is inserted in said pump installation bore and said positioning peg 
is inserted in said positioning groove of said adjusting plate. Both the 
positioning peg of the adjusting pin, which serves as the first adjusting 
means and is supported in the fastening flange so as to be adjustable, and 
the positioning groove in the adjusting plate arranged on the flange 
surface of the pump installation bore, which positioning groove is 
provided for receiving the positioning peg and serves the second adjusting 
means, are fully adjustable and can be secured in the position occupied by 
them after adjustment. When the plug-in pump is inserted in the pump 
installation bore the feed quantity adjusting element is coupled with the 
control rod belonging to the engine and the positioning peg is only 
inserted in the positioning groove of the adjusting plate. This mounting 
process is accordingly completely independent from the ability of the 
person mounting and, in the event of faulty adjustments or repairs, the 
necessary adjusting work can be repeated as often as desirfed without 
costly subsequent work by means of simple readjustment. When the adjusting 
pin carrying the positioning peg is constructed as an overhung crank with 
an eccentrically arranged positioning peg, then the adjusting pin can be 
used in an advantageous manner as an adjusting tool for turning the 
injection pump, so that the adjustment of the feed quantity to the plug-in 
pump is substantially simplified and made cheaper. 
The adjusting plate may be inserted between the fastening flange and the 
flange surface of the pump installation bore as a support for the 
fastening flange of the plug-in pump and can accordingly serve 
simultaneously as a pre-stroke adjusting plate. 
All pumps of the same series may project forward the same distance from the 
fastening flange until the outermost limit of the plug-in pump on the 
drive side and the same extent of projection is set at the pump 
installation bore of the internal combustion engine by means of selecting 
adjusting plates which are provided with a suitable thickness 
dimensioning, so that each plug-in pump of the same series can be inserted 
in any desired pump installation bore of the internal combustion engine 
without specially adapting the dimensioning which determines the 
pre-stroke. The pre-stroke determining the beginning of the feed is then 
safely ensured without fitting and adapting work and without carrying out 
costly checking work, and the adjusting plates serve at the same time as 
pre-stroke adjusting disks. 
A respective multiple-cylinder internal combustion engine whose control 
rod, as known from the EP-PS No. 0 090 226 which was already cited, is 
constructed in one piece with the counter-coupling parts may be arranged 
in the cylinder spacing for the feed quantity adjusting elements of the 
plug-in pumps which are arranged in a row; and the adjusting arrangement 
which is formed in each instance by one of two the adjusting means, may be 
furnished for the mounting of the plug-in pumps. 
The positioning peg forming the first adjusting aid may be arranged within 
a cut out portion which is offset relative to the support surface of the 
fastening flange and opens radially outward, and the adjusting plate may 
have the approximate form of a small U-shaped plate which projects into 
the cut out portion from the outside with a positioning groove forming the 
second adjusting aid and embraces the positioning peg on two sides and is 
fastened on the flange surface of the pump installation bore by means of a 
screw. Such a small adjusting plate is inexpensive and simple to produce 
and takes on no further functions, so that there are no special 
requirements with respect to the thickness tolerance or the surface 
evenness of this plate, as would be necessary if the adjusting plate 
simultaneously served as a pre-stroke adjusting disk. 
The objects at this invention are also attainable with a single-cylinder 
internal combustion engine which is equipped with an adjusting arrangement 
formed by the two adjusting means for carrying out the method according to 
this invention. 
In order to facilitate the mounting of the adjusting plate, the adjusting 
plate, which is shaped like a U-shaped plate, may be provided, with means 
for aligning the mounting position of the adjusting plate, in addition to 
the positioning groove and at least one through-opening for the fastening 
screw; and, this means may be formed by two recesses which are preferably 
arranged so as to be symmetrical relative to the positioning groove and in 
which the position securing pins of the pump dummy can then engage.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
A single-cylinder plug-in fuel injection pump 11, henceforth called plug-in 
pump for the sake of brevity, which is controlled by a beveled edge and is 
inserted in a housing 10 of the respective internal combustion engine is 
shown in FIGS. 1 and 2 in longitudinal section and a top view. Within a 
pump housing 12, a pump cylinder 15 is fastened in a pump housing 12 in a 
known manner with the intermediary of a pressure valve 13 by means of a 
screwed pipe 14. A pump piston 16 is guided within the pump cylinder 15 so 
as to be axially and rotatably movable and carries on its outer surface 
area a beveled control edge 17 which cooperates with a control borehole 18 
in the wall of the pump cylinder 15 in order to determine the feed 
quantity. A control sleeve which forms a feed quantity adjusting element 
19 is coupled with the pump piston 16 so as to be fixed against rotation 
relative to it, but permits its stroke movement and carries a driving pin 
20 as a coupling part for actuation by means of a control rod 21 which 
belongs to the engine, the driving pin or coupling part 20 being fastened 
at a control arm and arranged parallel to the longitudinal axis of the 
pump piston. The coupling part 20 engages in a slotlike counter-coupling 
part 22 at the control rod 21 belonging to the engine. For use in a 
multiple-cylinder internal combustion engine, the control rod 21 belonging 
to the engine is constructed in one piece with the counter-coupling parts 
22, which are arranged in the cylinder spacing so as to be fixed in 
position (not shown in more detail). The respective plug-in pumps 11 are 
then inserted, also in the same cylinder spacing, in a pump installation 
bore 23 of the housing 10 of the internal combustion engine and each pump 
installation bore 23 is provided on the mounting side with a flange 
surface 23a for attaching the plug-in pump 11. 
The pump housing 12 of the plug-in pump 11 carries a radially projecting 
fastening flange 24 which contains two through boreholes 25 for fastening 
screws 26 in the embodiment shown (see FIG. 2). The through boreholes 25, 
which can also be formed as elongated holes, are large enough so that a 
partial rotation of the pump housing 12 for the basic setting of the feed 
rate is possible. 
There is an adjusting arrangement 27, which is formed by two adjusting 
means, at the point of connection between the fastening flange 24 of the 
plug-in pump 11 and the flange surface 23a at the housing 10 for an 
accurately positioned installation of the plug-in pump 11. A positioning 
peg 28 of an adjusting pin 29 serves as a first adjusting aid and is 
supported in the fastening flange 24 so as to be adjustable with respect 
to rotation and projects forward on the drive side. This adjusting pin 29 
is formed as the overhung crank with an eccentrically arranged positioning 
peg 28 and, in this construction, can be used simultaneously as an 
adjusting tool for the rotation of the plug-in pump. An adjusting pin with 
a con centrically arranged positioning peg is also conceivable which would 
then have to be fastened so as to be displaceable in the circumferential 
direction in an elongated hole of the fastening flange 24 (not shown). The 
installed position of the positioning peg 28 is secured by means of a 
fastening nut 30 and is sealed, in addition, by means of a cap 31. Of 
course, the adjusting pin 29 can also be secured against rotation by means 
of other securing means, such as calking. 
An adjusting plate 32 is inserted between the fastening flange 24 of the 
plug-in pump 11 and the flange surface 23a on the internal combustion 
engine, which adjusting plate 32 embraces the positioning peg 28 on two 
sides with a positioning groove 33 which forms the second adjusting means 
(see also FIG. 7) and, in addition to through openings 34 for the 
fastening screws 26 of the plug-in pump 11 and a central opening 35 for 
receiving the pump housing 12, also comprises through openings 36 for 
screws 37 serving to fasten the adjusting plate 32. These through openings 
34 and 36 in the adjusting plate 32 are also constructed so as to be large 
enough so that, like the through openings 25 in the fastening flange 24 of 
the plug-in pump, they permit the necessary partial rotatability of the 
adjusting plate 32 described above. Of course, these through openings 34 
and 36 can also be formed as elongated holes. 
A spring disk 38 is fastened at the base of the pump piston 16 and, in the 
embodiment according to FIG. 1, receives a pre-stroke plate 39 with the 
thickness e, the outer front face of plate 39 forms a limit 41 of the 
plug-in pump 11 on the drive side. A roller tappet 42, which is indicated 
in dash-and-dot lines, belongs to the cam drive 43 (see also FIG. 5) of 
the internal combustion engine in the described constructional type of 
plug-in pump 11, but can also be an integrated structural component part 
of the pump in another known constructional type of plug-in pump. By means 
of selecting the thickness dimensioning e of the pre-stroke plate 39 the 
extent of projection UT, which determines the pre-stroke VH of the pump 
piston and occupies the bottom dead center, is adjusting from the 
fastening flange 24 to the outermost limit 41 on the drive side. The 
pre-stroke VH is the portion of the pump piston stroke which is traveled 
from the front side of the pump piston 16 on the side of the pump working 
chamber until the closing of the control borehole 18. 
FIGS. 3 to 7 serve to explain the method, according to the invention, for 
mounting the plug-in pumps 11 on an internal combustion engine and also 
contain the necessary arrangements. 
FIG. 3 again shows the extent of projection UT extending from the fastening 
flange 24 to the limit 41 of the plug-in pump on the drive side; FIG. 3a 
shows a spring disk 38' in section, and on an enlarged scale as a 
modification of the spring disk 38, the spring disk 38' is arranged at the 
piston base of the pump piston 16, whose thickness dimensioning e likewise 
serves for the adjustment of the extent of projection UT, the limit 41 of 
the plug-in pump 11 on the drive side being formed by the front face of 
the piston base of the pump piston 16 on the drive side. 
FIG. 4 shows the plug-in pump 11 inserted in a test bse 44 for the feed 
quantity adjustment. The positioning peg 28 serving as the first adjusting 
means is received by a recess which is formed as a positioning groove and 
serves as a device for the application of the first positioning means, and 
the coupling part 20 of the feed quantity adjusting element 19 is held in 
the basic testing position (e.g. middle position), or in a testing 
position diverging from this basic testing position by a predetermined 
distance, by an adjusting rod 46 of the test base 44 corresponding to the 
control rod 21 of the engine. The angular position thus occupied between 
the coupling part 20 and the positioning peg 28 is equal to the angle 
shown in FIGS. 2 and 7 when the control rod 21 belonging to the engine is 
in the basic testing position. 
FIG. 5 shows the dimensioning at the pump installation bore 23 of the 
internal combustion engine which are required for determining the 
pre-stroke at the plug-in pump. The extent of projection UT which is set 
at the plug-in pump 11 is adjusted at the internal combustion engine as a 
degree of depth, but is designated in the same manner. It comprises a 
distance X, extending from the flange surface of the pump installation 
bore 23 to a support surface 47 at the cam drive 43, and the thickness c 
of the adjusting plate 32, which is made available in different thickness 
dimensioning. In this case, the cam drive 43 also comprises the roller 
tappet 42 so that the support surface 47 is located at the roller tappet 
42 of the cam drive 43. If a plug-in pump with integrated roller tappet 
were used the extent UT would reach the base circle of the respective 
drive cam, which would then form the support surface 47. The extent of 
projection UT is then produced at the plug-in pump by means of exchanging 
the rollers. 
FIGS. 6 and 7 show, among other things, a pump dummy 48 which is inserted 
in the pump installation bore 23 and serves for the adjustment of the 
adjusting plate 32. The pump dummy 48 comprises a dummy body 49 which 
corresponds at least to a portion of the pump housing 12 and which is 
inserted in the pump installation bore 23 and, in addition to a stationary 
coupling part 50 which corresponds to the coupling part 20 of the feed 
quantity adjusting element 19, carries a positioning peg 52 at a 
flangelike projection 51, which positioning peg 52 corresponds in position 
and dimensioning to the positioning peg 28. The stationary coupling part 
50 and the positioning peg 52 are at a fixed angular distance from one 
another, which angular distance is assigned to the basic testing position 
of the control rod 21 of the engine and is characterized by angle .alpha.. 
The method, according to the invention, for mounting the plug-in pumps 11 
on the correspondingly constructed internal combustion engine is described 
in the following particularly with the help of FIGS. 3 to 7 of the drawing 
and comprises the following method steps in accordance with the first 
embodiment: 
(a) Prior to the mounting of the plug-in pump 11 a close tolerance extent 
of projection UT (see FIGS. 1 and 3) is set from the fastening flange 24 
to the outermost limit 41 of the plug-in pump 11 on the drive side in 
order to adjust the pre-stroke VH which determines when the feed begins. 
The extent of projection UT, which is the same for all pumps of the same 
series, is adjusted by means of installing or exchaning a structural 
component part, e.g, the spring disk 38' in FIG. 3a or the pre-stroke 
plate 39 in FIG. 1, which is provided for this purpose and which is made 
available with a suitable thickness dimensioning e; 
(b) also, prior to the installation of the plug-in pump 11, the same extent 
of projection UT is set at the pump installation bore 23 of the internal 
combustion engine (see FIG. 5) as a degree of depth, including the 
adjusting plate 32 and the support surface 47 at the cam drive 43, by 
means of selecting the adjusting plate 32 which is made available with 
suitable thickness dimensioning c; 
(c) in order to adjust the feed rate and the position of the first 
adjusting means of the adjusting arrangement 27, the plug-in pump 11 is 
inserted in the test base 44 and the coupling part 20 of the feed quantity 
adjusting element 19 is held in the basic testing position, or in a 
testing position which diverges from the basic testing position by a 
predetermined amount of distance, by the adjusting rod 46 of the test base 
44 at the test bench; the positoning peg 28 serving as the first adjusting 
means is received by in the recess 45 of the test base 44; 
(d) in a test bench which is driven at a fixed rate of rotation, the feed 
rate of the plug-in pump 11 is measured and the latter is rotated until 
the feed rate corresponds to a desired feed rate, wherein the adjusting 
pin 29 provided with the eccentric positioning peg 28 is used as the 
adjusting tool; 
(e) the adjusted rotational position of the plug-in pump 11 assigned to the 
desired feed rate is fixed at the plug-in pump 11 in that the adjusting 
pin 29 is secured in the position which it occupies after the adjustment 
of the feed rate, i.e. the fastening nut 30 is tightened and the sealing 
cap 31 is pressed in; 
(f) for the purpose of the preliminary preparation for mounting the plug-in 
pump on the pump installation bore 23 of the internal combustion engine 
(see FIGS. 6 and 7), the control rod 21 of the engine is put into the 
basic testing position and is blocked in this position; a pump dummy 48 is 
then inserted through the central opening 35 of the adjusting plate 32 
into the pump installation bore 23 and introduced into the 
counter-coupling part 22 of the control rod 21 with its stationary 
coupling part 50; when the screws 37 are loosened the adjusting plate 32 
is rotated into a position such that its positioning groove 33, which 
serves as the second adjusting means, receives the positioning peg 52 of 
the pump dummy 48; the positioning peg 52 and the coupling part 50 are now 
at the fixed angular distance which is characterized by angle .alpha. and 
which is also the basis of the adjustment of the positioning peg 28 at the 
plug-in pump serving as the first adjusting means; in this position the 
adjusting plate 32 is fixed by means of tightening the screws 37 at the 
pump installation bore 23 and the pump dummy 48 is then removed again; 
(g) now the plug-in pump 11 is inserted in the pump installation bore 23 
and the feed quantity adjusting element 19 is coupled with the control rod 
21 of the engine in that the coupling part 20 is introduced into the 
counter-coupling part 22 (see FIG. 1), the positioning peg 28 is 
simultaneously made to overlap with the positioning groove 33 of the 
adjusting plate 32 and introduced into this groove; in this installation 
position the plug-in pump 11 is fastened on the internal combustion engine 
by means of the fastening screws 26; 
(h) a limiting stop for the control rod 21 is adjusted to a full load 
position corresponding or assigned to the testing position, and the 
blocking of the control rod 21 of the engine is discontinued again. 
The method described above can be automated to a great extent, and the 
mounting of the plug-in pumps can be carried out by means of robots, for 
example, since the aligning work to be carried out manually by a skilled 
worker is no longer necessary. 
The second embodiment, shown in FIGS. 8 and 9, for carrying out the method 
according to the invention, differs substantially only in that the 
adjusting arrangement 27A is constructed differently. Therefore, identical 
parts are designated by the same reference numbers, parts that are 
different have the letter A added to their reference numbers and new parts 
are provided with new reference numbers. 
The adjusting pin 29 is displaceably supported in a portion of the 
fastening flange 24A of the plug-in pump 11A which projects out laterally 
in the second embodiment shown and is provided on the front side with the 
positioning peg 28 forming the first adjusting means, as in the first 
embodiment example. Unlike the first embodiment, this positioning peg 28 
does not project out over a support surface 24a of the fastening flange 
24A on the drive side but, rather, lies within a cut out portion 55 which 
is offset parallel to the support surface 24a of the fastening flange 24a 
and opens radially outwardly. The adjusting plate 32A, which has the 
approximate form of a small U-shaped plate, projects into this cut out 
portion 55. In the shown mounting position with the positioning groove 33 
forming the second adjusting means, the adjusting plate 32A embraces the 
positioning peg 28 on two oppositely located sides and is fastened on the 
flange surface 23a of the pump installation bore 23 on the housing 10 of 
the internal combustion engine by means of a screw 37. 
In addition to the positioning groove 33, which is open toward the plug-in 
pump 11A, and a through opening 36 for the screw 37, which is used for 
fastening, the U-shaped adjusting plate 32A is also provided with means 
for aligning the mounting position of the adjusting plate 32A. This 
aligning means is formed by two recesses 56 which are arranged on the two 
sides of the positioning groove 33, as seen from the center of the pump, 
so as to be offset in an outward direction and symmetrical with respect to 
the positioning groove 33. These recesses 56 serve to receive the position 
securing pins on the pump dummy, which is not shown but is mounted in a 
manner similar to the pump dummy 48 in FIGS. 6 and 7. In addition to the 
positioning peg 52, this pump dummy also carries two position securing 
pins, which correspond in position to the recesses 56, at a radially 
outwardly lengthened portion of the projection 51 in order for the 
adjusting plate 32A to be aligned radially with respect to the 
longitudinal axis of the plug-in pump 11A in every mounting position 
determined by means of the testing position of the control rod 21 (see 
FIG. 7) or the testing position of a corresponding control element. 
A sealing disk 58 and one or more pre-stroke adjusting disks 59, whose 
total thickness was determined beforehand in correspondence with the 
dimensioning c in FIG. 5 in the corresponding aforedescribed method step 
b, are inserted between the flange surface 23A or, as is shown, between a 
spot facing 57 in the area of the flange surface 23A and the support 
surface 24a of the fastening flange 24A. The thickness of these disks 58, 
59 and the adjusting plate 32A, as well as the height of the positioning 
peg 28, are adapted to one another in such a way that there is always play 
between the adjusting plate 32A and the recess 56, as well as between the 
front face of the positioning peg 28 and the flange surface 23A, the play 
being designated by d in FIG. 8. 
The method for mounting the plug-in pump 11A on the correspondingly 
constructed internal combustion engine, which method is carried out with 
the use of the adjusting arrangement 27A described with reference to FIGS. 
8 and 9, differs only slightly in some method steps from the method 
described for the first embodiment. Thus, in the method step b, as already 
mentioned, the depth dimensioning corresponding to the extent of 
projection UT is set by means of selecting the pre-stroke adjusting disk 
59 which is made available in the required quantity or with suitable 
thickness dimensioning; method steps a, c, d and e are adopted without 
modification; instead of the adjusting plate 32, which covers the entire 
flange surface, the small U-shaped adjusting plate 32A is put into the 
corresponding position in method step f by means of the pump dummy and is 
fastened with screw 37; method steps g and h, in turn, are not different. 
The plug-in pumps 11 and 11A which are mounted according to the method 
modifications described above generally do not need to be check with 
respect to their full load position after being mounted; the output 
adjustment of the internal combustion engine and the checking of the 
output also become unnecessary when using the method according to the 
invention, or one need only briefly check the functioning. Accordingly, in 
multiple-cylinder internal combustion engines the otherwise very costly 
coordination of the individual pump elements is also dispensed with and 
the control rod of the engine can be constructed in one piece with the 
counter-coupling parts for the feed quantity adjusting elements of the 
plug-in pumps, which counter-coupling parts are arranged in the cylinder 
spacing. 
However, the advantages mentioned above are also attainable in 
single-cylinder internal combustion engines and their control rod or their 
correspondingly constructed control element (control lever) need no longer 
be adjusted or corrected with reference to the basic adjustment after the 
installation of the plug-in pump. 
The invention also extends to pump nozzles which are inserted in the 
cylinder head of an internal combustion engine and are driven by the 
camshaft belonging to the engine and controlled by means of a control rod 
which belongs to the engine and is common to all the pump nozzles, because 
the individual injection pumps which comprise the respective injection 
nozzles to form a constructional unit are also "plug-in pumps". 
It will be understood that each of the elements described above, or two or 
more together, may also find a useful application in other types of 
methods of mounting injection pumps on internal combustion engines 
differing from the types described above. 
While the invention has been illustrated and described as embodied in a 
method of mounting an injection pump on an internal cmbustion engine, it 
is not intended to be limited to the details shown, since various 
modifications and structural changes may be made without departing in any 
way from the spirit of the present invention. 
Without further analysis, the foregoing will so fully reveal the gist of 
the present invention that others can, by applying current knowledge, 
readily adapt it for various applications without omitting features that, 
from the standpoint of prior art, fairly constitute essential 
characteristics of the generic or specific aspects of this invention.