CHRYSLER SERVICE MANUAL
ENGINE—171
nals finished, .001 inch under
size.
The position
of undersize journal or journals will be stamped
on machined surface of Number 3 counter-
weight (Fig. 49). Connecting rod journals will
be identified by letter "R" and main bearing
journals by letter "M". Thus, "M-l" indicates
that Number 1 main bearing journal is .001
inch undersize.
Bearing shells are available in standard and
the following undersizes. .001, .002, .003, .010
and .012 inch. Never install an undersize bear-
ing shell that will reduce the clearance below
specifications.
36.
REMOVAL AND INSTALLATION OF
MAIN BEARINGS (CRANKSHAFT
IN ENGINE)
a. Removal
Remove oil pan and mark bearing caps before
removal. Remove bearing caps one at a time.
Remove upper half of bearing by inserting
Tool C-3059 (Fig. 53) in oil hole of crankshaft.
Slowly rotate crankshaft clockwise, forcing
out upper half of bearing shell.
b.
Checking Bearing Clearance
Remove spark plugs to relieve compression.
Check each bearing separately, do not loosen
the other bearing caps.
Install bearing shell in cap and place a piece
of oiled, .001 inch feeler stock (ifa inch wide
and 1 inch long) between bearing and crank-
shaft journal (Fig. 54). Install and tighten
bearing cap bolts to 85 foot-pounds torque.
BEARING CAP—*H
SHIM STOCK
51x54
Fig.
54—Checking Main Bearing Clearance with
Shim Stock
If a slight drag is felt as crankshaft is ro-
tated, the clearance is .001 inch or less, and is
considered satisfactory. If crankshaft cannot
be rotated, the bearing is too small and should
be replaced with the correct size.
If no drag is evident reduce clearance with
undersize bearing inserts until a slight drag
is felt with a .001 inch shim in place between
bearing shell and crankshaft journal. It is per-
missible to use a .001 inch undersize bearing
with a standard bearing or a .002 inch bearing.
Always use the smaller diameter bearing half as
the upper housing
half.
Never use a new bear-
ing with used bearing and never use an upper
bearing half more than .001 inch smaller than
the lower bearing
half.
c. Installation
NOTE
Fig.
53—Removing and Installing Main Bearing
Upper Shell
When installing a new upper bearing shell,
slightly chamfer the sharp edge from plain side.
Start bearing in place, and insert Tool C-3059
in oil hole of crankshaft (Fig. 53.) Slowly ro-
tate the crankshaft counter-clockwise, sliding
bearing into position.
After all bearings have been fitted, tighten
Number 3 (center) main bearing first, and
work alternately to both ends. Tighten all caps
to 85 foot-pounds torque.
Crankshaft end play should be .002 to .007
inch.
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