Bearings Crankpin; Main; Bushings, Piston Pin; Crankpin Bearings - Champion A Series Operating And Service Manual

PISTON PIN BUSHINGS -- The bronze piston pin
bushings are a press fit in the piston and bored for prop-
er running clearance with the pin. The suggested meth-
od for installing new bushings is to "freeze" the bushing
in dry ice or cold storage box until it shrinks enough to
slip in the bore. Using a press may damage the bush-
ing.
After the bushings are installed, they must be bored for
proper running clearance. The bushing bore must be
square with piston so piston will run true in the cylinder.
It is not recommended that the bushing be honed as grit
will embed in the bushing, causing rapid wear of the
parts.
PISTON PINS -- Piston pins are clamped by the con-
necting rod for proper positioning. Make sure the clamp
screw is torqued properly.
CRANKPIN BEARINGS -- Crankpin bearings are of
the renewable insert type. When installing new inserts
the bore of the rod and the back of the insert must be
absolutely free of dirt and burrs. Dirt or burrs under the
insert will cause early insert failure. Where there is a
possibility of bearing metal or dirt entering the oil pas-
sages of the conn--rod, the passages must be thor-
oughly cleaned before installing new inserts. Coat the
crankpin with oil to prevent a dry start. The small pro-
jection on the insert must fit in the corresponding re-
cess in the rod and cap. Do not file ends of inserts or
rod caps. Assemble the rod and cap with cast timing
marks on the same side. Tighten bolts evenly until
proper torque is attained.
Do not torque each bolt to rating sep-
arately as this will cause the rod bore
to deform to an out- - of- -round condi-
tion.
CRANKSHAFT OIL SEAL -- The crankshaft oil seal
must be installed with the lips of the seal facing in to-
ward the oil side to retain oil in the crankcase. Double
lip seals should be packed with grease between the
lips.
"O"- -RINGS AND GASKETS - - All assembled joints
are sealed with properly selected heat resistant
"O"--rings except for the crankcase inspection plate
and intercooler manifold joints which are sealed with
gaskets. If it is necessary to break any of these joints,
be sure that both metal surfaces are clean and smooth
and use new "O"--rings or gaskets before reassem-
bling. See the parts list for proper "O"--ring and gasket
part numbers. "O"--rings must be lubricated with a suit-
able "O"--ring grease to ensure proper performance.
MAIN BEARINGS -- Main bearings are Timken tapered
roller type. They are correctly adjusted at the factory by
means of shims between the bearing housing and the
crankcase. Correct crankshaft end play is 0 to .001".
VACUUM PUMPS -- The instructions covering single--
stage compressors may be applied to vacuum pumps
as the construction of the compressors and vacuum
pumps is identical.
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