The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1915-07-22

times have frightened the connecting
rod bearings so tightly that il is easily
felt while crankine the machine. When
nave run 400 or 500 miles the knock
reappears. The machine has run $500
miles in all. Can you tell the trouble2
The most probable cause If the
knock you mention is a loose bearing.
This may be a main, connecting rod,
wristpln or camshaft bearing. 1t
might also be caused by a broken PTS
ton ring, the camshaft being out of
alignment, or If the knock is not very
severe It may be the result Of carbon
on a valve seat. AS 1t is most probable
that Is It In the crankshaft bearings,
these should be inspected and If nee
essary carefully taken up, or If they
are badly scored they may need to be
scraped, or in an extreme case they
will require replacing. In taking up
the bearings great care should be ex-
ercised not to get them too tight, and
It should be noted that 1t Is quite pos
sible that the reason yorT machine be-
gins TO knock again after going 400 or
500 miles after the bearings have been
adjusted too tightly. When a bearing
is too tight excessive friction is the re-
suit, and overheating occurs. This
wears the bearing away in q very short
time and in some cases may even melt
the metal. The bearing should be only
taken up enough to remove all play.
1t would hardly seem possible that
the bearings should need scraping
after the car has gone such a short dis
lance, but II they have been adjusted
too tightly 1t may be that they are bad
" scored, and II this is the case scrap
Ing will be necessary. This operation
should be left to the are Of an ex-
perienced and skillful mechanic and is
a Job for the novice.
Kindly tell mo the best way to true
up tho wheels on a car. feel that my
wheels are not running true.
Before anything Is done be certain
that the wheels need truing UP. Some
times all that is necessary Is to re-
adjust the tie rod, which connects
both wheel knuckles. Wabbling front
wheels may be caused by a bent axle,
bent spindle, partially broken bearing.
interior Of hub worn, etc. The COM
repair man can benz these back IN
shape.
Why 10 II hard for me to start my car
%vhen run out Of gasoline n refill
the tank asain2
Possibly the carburetor float sticks
against the side Of the chamber, so
that it Is difficult for the gasoline to
flow In. Another explanation is that
there Is dirt In the fuel pipe and that
therefore the passage Of fuel Is very
slow, with the result that 1t takes
some time for the chamber to become
filled, and II an attempt Is made to
start before this time difficulty may
be experienced.
Can you toll mo how to mend a crack
in the crank case2 Il 10 so bad that
the oil leaks out in a short time.
You cannot mend this yourself un-
less 1t is very small, in which case
you might be able to patch it with a
piece Of sheet steel metal and some
rivets. II the crack Is of any size 1t
is best to have it welded, although If
the place Is so situated that it Is not
strained by the operation Of the motor
1t may be sufficient to solder 1t.
What effect does tho practice Of US
ing the motor as a brake coming down
a hill have on the mechanism of an au-
tomobile?
The use of a motor as a brake Is
generally conceded to have a more or
less d~eleterious effect on the gears.
The power through the gears Is re-
versed, since the car Is now tending
to drive the motor. Thus instead OF
having the stepdown reduction we
have a step-up with consequently
more surface pressure on the teeth
and hence more abrasion.
Where 10 the best place to look for 9
knock?
All moving joints are susceptible tC
knocks. Tracing through the trans
mission Of power from the cylinder t.
the rear axle, we find that at eacl
point Of engagement Of M or mOr'
moving parts with other parts there Il
a chance for a knock. Starting will
the piston, II this Is too loose, Their
will be a distinct slapping sound. l
can only be cured by the use Of al
diversified piston. The next point Is a
the wrist pin. which might have
knock due to looseness In the uppe
connecting rod. The fourth point Is II
the main bearings In the ~crankshafi
nth at the connection between tn
crankshaft and clutch. then In the un'
versal joints and the gear box beal
ings and between the teeth of the dii
ferent gears. Loose valve tappetl
timing gears, ETC., r also fruitfs
sources Of knocks.
Will Il shertsn the life Of . piston b
drilling to Tighten IL er 10 there an
disadvantage In % doInof
!, You can drfl the pistons and q
lgood RESULTS. Many racing cars ~
such pistons. It win b better an
II ~h>~~>- - 49, 3nnA ~ USf uintnna 1