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9-20
ENGlNES4-CYLINDER
(3) Install the bearings in pairs.
Do
not use a new
bearing with an old bearing. Do not file the rods or
the bearing caps.
=I,
CRANKSHAFT (CONNECTING ROD) JOURNAL
MEASURING THE CONNECTING ROD
BEAR1 NG CLEARANCE
Shim Stock Method
(1) Place an oiled .001 inch feeler stock
( Y 2
inch
wide and
3 / 4
inch long) between the bearing and the
connecting rod journal.
(2) Install the bearing cap and tighten to 45 foot-
pounds torque.
(3) Turn the connecting rod '/4 turn in each direc-
tion. A slight drag should be felt which indicates
clearance is satisfactory. The correct clearance is from
.0005 to .0015 inch.
(4)
The side play should be from
.006
to .012 inch.
Insfulling Pisfon und Connecting Rod
Assembly in Cylinder Block
(1) Compression ring gaps should be located on the
left side of the engine and staggered about 60" apart.
Neither gap should line up with the oil ring rail gaps.
(2) Rotate oil ring expander so that the ends are at
the right side of the engine. Rotate the steel rails so
that the gaps are approximately opposite and posi-
tioned above the piston pin holes.
(3) Immerse the piston head and rings in clean en-
gine oil. Slide the ring compressor, Tool C-385, over
the piston and tighten with special wrench (part of
Tool C-385).
Position of rings must not change during
this operation.
(4) The notch on the top of the piston must point
toward the front of the engine so that squirt hole in
the connecting rod is toward the right side of the en-
gine.
(5) Screw the connecting rod bolt protector (part
of Tool C-3221) on one rod bolt, and insert the rod
and piston into the cylinder bore.
Rotate the crank-
shaft so that the connecting rod journal is on the
center of the cylinder bore.
(6)
Attach the puller part of Tool C-3221 on the
other bolt, and guide the rod over the crankshaft
journal (Fig. 40). Be careful not to nick the connect-
ing rod journals.
(7) Tap the piston down in the cylinder bore, using
the handle of a hammer. At the same time, guide the
connecting rod into position on the crankshaft jour-
nal.
(8)
Install the rod caps, tighten nuts to 45 foot-
pounds torque.
CRANKSHAFT MAIN JOURNALS
The crankshaft journals should be inspected for
r
NY147
-
*
Fig. 40-Removing
and Installing Connecting
Rod
l100l C-322 11
excessive wear, taper and scoring. Journal grinding
should not exceed .012 inch under the standard jour-
nal diameter. Do not grind the thrust faces of No. 3
main bearing. Do not nick the connecting rod or main
bearing journal fillets. After regrinding, remove the
rough edges from the crankshaft oil holes and clean
out all oil passages.
CRANKSHAFT MAIN BEARINGS
The NOS. 1, 2 and 4 lower main bearings are inter-
changeable (Fig. 41). The NOS. 2 and 4 upper main
bearings are interchangeable.
The NO.
1
upper main bearing
i s not interchange-
able and is chamfered
on the tab side for timing chain
oiling and can be identified by a red marking on the
edge of the bearing. Upper main bearings are grooved
and lower main bearings are plain and are not
inter-
1
2
4
,
UPPER
LOWER
-
NY143
Fig. 41-Main
Bearing Identification
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