CHRYSLER SERVICE MANUAL
ENGINE—27
of the undersize journal or journals will be
stamped on machined surface of Number 3
counter-weight (Fig. 47). Connecting rod jour-
nals will be identified by letter "R" and main
bearing journals by the letter "M". Thus, "M-l"
indicates that Number 1 main bearing journal
is .001 undersize. Also, a diamond-shaped mark-
ing stamped on engine numbering pad indicates
that All tappet bodies are .008 inch oversize.
(See Fig. 46).
30.
INSTALLING CONNECTING ROD BEARINGS
NOTE:
Fit all rods of one bank until completed.
Do not alternate from one bank to another, be-
cause when rods are assembled to pistons cor-
rectly, they are not interchangeable from one
bank to another.
Each bearing cap has a small "V" groove across
the parting face. When installing the lower
bearing shell, make certain that "V" groove in
shell is in line with "V" groove in cap. This al-
lows lubrication of the cylinder wall. The bear-
ing shells should always be installed so that
small formed tang fits into machined grooves
of rods. The side play should be from .006 to
.014 inch (two rods).
Limits of taper or out-of-round on any crank-
shaft journals should be held to .001 inch. Bear-
ings are available in .001, .002, .003, .010 and
.012 undersize.
NOTE:
Install bearings in pairs. Do not use a
new bearing half with an old bearing
half.
Do
not file rods or bearings caps.
55x162
Fig.
47—Internal Identification (Parts other than
standard size)
31.
CHECKING CONNECTING ROD BEARING
CLEARANCE (PLASTIGAGE METHOD)
The measurement of connecting rod bearing
clearance can be done with the use of Plastigage
with the engine in the chassis. After removing
the connecting rod cap, wipe off oil from the
journal and inserts. Place the Plastigage on
bearing, parallel with crankshaft. Reinstall cap
and tighten attaching nuts alternately to speci-
fied torque.
Remove cap and measure the width of the
compressed material with the graduated scale
to determine bearing clearance. Allowable clear-
ance is from .0005 to .0015 inches. If taper of
compressed material is evident, measure with
the graduated scale. If difference exceeds .001
inch,
journal should be checked with microm-
eters.
32.
INSTALLING PISTON AND CONNECTING
ROD ASSEMBLY IN CYLINDER BLOCK
Before installing pistons, rods, and rod as-
semblies in bore, be sure that compression ring
gaps are diametrically opposite one another and
not in line with oil ring gap. The oil ring ex-
pander gap should be toward the outside "V"
of engine. The oil ring gap should be turned
toward the inside of the "V" of engine. Im-
merse piston head and rings in clean engine
oil, slide ring compressor, Tool C-385, over
piston, and tighten with special wrench (part
of Tool C-385). Be sure position of rings does
not change during this operation. Screw con-
necting rod bolt protector (part of Tool C-
3221) on one rod bolt, and insert rod and
piston into cylinder bore. Attach puller part
of Tool C-3221 on the other bolt, and guide
the rod over crankshaft journal. Tap piston
down in cylinder bore, using handle of a ham-
mer. At the same time, guide connecting rod
into position on crankshaft journal. The notch
or groove on top of piston must be pointing
toward front of engine and the larger cham-
fer of connecting rod bore must be installed
toward crankshaft journal fillet. Install rod
caps,
tighten nuts to 45 foot-pounds torque.
33.
CRANKSHAFT
The crankshaft journals should be checked for
excessive wear, taper and scoring. Journal
grinding should not exceed .012 inch under the
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