The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1916-08-10

oUodT0o IS koyI
If the driving pinion has sheared its
key this can be readily determined by
the fact that with the gears in neutral
the propeller shaft can be rotated by
means OF a pipe wrench without NOV
ing the rear wheels.
Why do they make eight cylinder en-.
sines Of the v type ninety degrees
apart and twelve cylinders sixty de.
srees?
In the eight cylinder motor there are
four explosions to each revolution. Di-
viding 800 degrees, or a complete revo-
luton, by four gives ninety degrees,
the necessary angle between the cylin-
der blocks. With the twelve cylinder
revolution, and dividing 800 by six
gives sixty degrees as the necessary
angle.
Would it be an advantage to have
some hand control device attached to
the intake manifold above the car
buretor to make it possible to add an
extra supply of air to the mixture when
operating an automobile?
Many drivers are using such an at
tachment to great advantage. These
extra air devices are open when run
ming at fairly high rates Of speed and
cut down the fuel consumption.
Will you kindly describe the best way
to set up connecting rod and main
bearings for casting? refer mainly
to bearings that overlap the sides of
the bearing cap as is common in die
cast bearings.
The common method of procedure is
to set up the connecting rods in a fix.
ture, which Is fitted with a mandrel a
little smaller than the inside of the fin
ished bearing. This fixture has a re-
cess at the top and bottom, which al
lows the metal to partially flow over
the sides of the connecting rod. form
ing the fanges on the finished bearing.
The babbitt is poured through a hole in
the top plate. Upon removing the CON
Meeting rod from the fixture the babbitt
lining is found cast in place. A swedge
Is then forced through the bearing in
order to make sure that the lining is in
perfect contact with the connecting
rod at the back. The bearings are then
ner for fitting bearings.
Suggestions regarding the manner Of
carrying out this work have been given
by one Of the large manufacturers of
babbitt as follows.
First.-Use an absolutely clean ladle
and pot. When the metal is hot enough
to brown a piece of paper or white pine
stick, stir thoroughly and remove any
skimmings caused by oxidation.
Second.-Be sure the faces Of boxes
and mandrels are clean and free from
grease or dampness.
Third.-Pour rapidly into the box.
holding the ladle as closely to the work
as possible to avoid air bubbles until it
is half full. then pour gradually until
filed. allowing large enough gate to
take up shrinkage. When pouring
castings with wide surface use ladle
with wide lip.
Fourth.-To insure perfect boxes in
pouring large bearings it is advisable
to run chalk on mandrel or shaft and
to have the mandrel hot. Mandrel and
box should be about same temperature.
Ffth.-Do not keep babbitt metal at
the melting point longer than absolute
ly necessary. as the chemical action Of
extreme heat tends to oXidiZe a COM
posite alloy. causing deterioration, dis
Indignation. addition to its brittleness
and materially affecting its anti-fric-
ton qualities.
Sixth.-When necessary to peen it is
best to commence up and down a GEN.
ter line, extending blows right and left
of this line until frightened in place.
Seventh.-Finally when you have a
good metal treat it as such, and you
will have n occasion to complain Of
the results obtained.
My motor runs we'll until I strike a
steep hill and have to open the throttle
wide, when the engine seems to choke,
and skipping follows. The throttle is
situated SO that the engine idles
smoothly when the throttle 10 closed. It
10 not a question of mixture, at least
"'Su tV0 GVottiC 70 not OpcUeO WuCn,
for have tried different adjustments
OF the mixture needed. What 10 the
matter7
You are not getting enough air at
full throttle opening, and you should
change the carburetor adjustment to
correct this fault.
In grinding valves some say to turn
them all h way around and keep on
that way, occasionally putting on more
grinding compound, and others state
that the valves should not be turned
over ons-quartsr way around, thus 70.
tatins back and forth. Others claim
about halfway around and thus rotate
them backward and forward. Which
10 the correct way?
When grinding valves the valve
should not be turned to a complete ro-
tation at any time. but should ha
worked backward and forward to one
quarter the circumference. After this
has been done several times the valves
should be lifted free OF the seat and
nj