28—ENGINE
CHRYSLER SERVICE MANUAL
standard journal diameter. DO NOT grind
thrust faces of No. 3 main bearing. DO NOT
nick crankpin or main bearing fillets. After
regrinding remove rough edges from crank-
shaft oil holes and clean out all oil passages.
34.
CRANKSHAFT BEARINGS
The halves of Number 1, 2 and 4 bearings are
interchangeable (the bearing caps are not in-
terchangeable) and should be marked at re-
moval to insure correct reassembly. Number 3
bearing, which controls the crankshaft end
thrust, is not interchangeable with the others.
The upper and lower halves, however, of Num-
ber 3 bearing are interchangeable. Number 5
bearing halves are not interchangeable. Bear-
ing shells are available in standard and the fol-
lowing undersizes: .001, .002, ,003, .010 and
.012 inch. Never install an undersize bearing
shell that will reduce the clearance below
specifications.
35.
REMOVAL AND INSTALLATION OF MAIN
BEARINGS
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. 48) in oil hole of crankshaft.
Slowly rotate crankshaft clockwise, forcing out
upper half of bearing shell.
b.
Checking Main Bearing Clearance
PLASTIGAGE METHOD. Use same technique
as described in Paragraph 31.
CAUTION
If bearings are measured with the engine in
the chassis, the crankshaft must be supported
in order to take up clearance between the upper
bearing insert and crankshaft journal. This can
be done by snugging bearing caps of adjacent
bearings with .005 to .015 inch cardboard be-
tween lower bearing shell and journal. Be sure
to remove cardboard. Use extreme caution when
this is done to avoid unnecessary strain on the
crankshaft or bearings or false reading may be
obtained. Do not rotate crankshaft while plasti-
gage is installed.
It is permissible to use a .001 inch unfdersize
bearing with a standard bearing or a .002 inch
REMOVING!
Fig.
48—Removing and Installing Main Bearing
Upper Shell
bearing. Always use the smaller diameter bear-
ing half as the upper housing
half.
Never use
a new bearing with used bearing and never use
an upper bearing half more than .001 inch
smaller than the lower bearing
half.
c. Installation
NOTE:
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. 48). Slowly ro-
tate the crankshaft counter-clockwise, sliding
bearing into position.
FULL FLOW
OIL FILTER
FILTER BY-PASS
VALVE ASSEMBLY
ANTI DRAIN-BACK
VALVE BODY
REAR MAIN
BEARING CAP
OIL PUMP ASSEMBLY
57x228
Fig.
49—Installing By-Pass Valve — Rear Main
Bearing Cap
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