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8-56
GROUP
8-
ENGINE
INSTALL SEAL WITH LIP
TOWARDS FRONT OF ENGINE
FRONT OF ENGINE
SEAL
HALVES
TO PROTRUDE BEYOND PARTING FACES
THIS
DI STANCE TO ALLOW FOR CAP TO BLOCK ALIGNMENT
REAR FACE
OF
REAR MAIN
BEARING CAP AND CY
LI
NDER BLOCK
FIG. 29- Installing Crankshaft Rear Oil
Seal
SEALER
FIG.
30- Seeler Application to Rear Main
Bearing Cap
INSTALLATION
1. If the rear main bearing is being
replaced, clean the rear oil seal groove in
the block with a brush and solvent.
Carefully install the upper seal (split
lip type) into its groove with the undercut
side of the seal toward the FRONT of the
engine (Fig. 29) by rotating it on the seal
journal
of
the
crankshaft
until
approximately 3/8 inch protrudes below
the parting
surface.
Be sure no rubber has been shaved
from the outside diameter of the seal by
the bottom edge of the groove.
Tighten the bolts on main bearings
1,
2,
3,
and 4, thereby raising the crankshaft
to its original position. Torque the bolts to
specifications.
2. Clean the crankshaft
journals.
Inspect the journals and thrust faces
(thrust bearing) for nicks, burrs or bearing
pick-up that would cause premature
bearing
wear.
3. To install the upper main bearing,
place the plain end of the bearing over the
t
3/
8"
VIEW LOOKING AT PARTING FACE
OF SPLIT, LIP· TYPE CRANKSHAFT SEAL
A 2639-B
shaft on the locking tang side of the block
and partially install the bearing so that
tool 6331 can be inserted in the oil hole in
the crankshaft. With tool 6331 positioned
in the oil hole in the crankshaft, rotate the
crankshaft in the opposite direction of
engine rotation until the bearing seats
itself. Remove the tool.
4.
Replace the cap bearing.
5.
Select fit the bearing for proper
clearance
following
procedures under
Fitting Main and Connecting Rod Bearings
in Part 8-1.
6.
If the bearing is being replaced on
journal number 1, 2 or 4, apply a light
coat of engine oil to the journal and
bearings and install the bearing
cap.
Tighten the cap bolts to
specifications.
7. If the rear main bearing is being
replaced, clean the oil seal groove with a
brush and solvent.
8. Install the lower seal in the rear
main bearing cap with undercut side of
seal toward the FRONT of the engine
(Fig. 29) allow the seal to protrude
approximately 3/8 inch above the parting
surface to mate with the upper seal when
the cap is installed.
9.
Apply
a
thin
coating
of
oil-resistant sealer to the rear main bearing
cap at the rear of the top mating surface
(Fig. 30).
Do not apply sealer to the area
forward
of
the
oil
slinger
groove.
Lubricate the journal with engine oil and
install the rear main bearing cap with the
rear surface flush or slightly forward of
the rear of the cylinder block. Tighten the
cap bolts to specifications.
10.
If
the thrust bearing cap (No. 3
main bearing) has been removed, install it
as
follows:
Lubricate the journal with engine oil
and install the thrust bearing cap with the
bolts fmger-tight.
Pry
the crankshaft
forward against the thrust surface of the
upper half of the bearing (Fig. 44). Hold
the crankshaft cap to the rear. This
will
align the thrust surfaces
of.
both halves of
the bearing. Retain the forward pressure
on the crankshaft. Torque the cap bolts to
specifications.
11. Clean the oil pump inlet tube
screen. Prime by filling the inlet opening
with oil and rotate the pump shaft until
oil emerges from the outlet
opening.
Install the oil pump and the inlet tube
assembly.
12.
Position the oil pan gaskets on the
oil pan. Position the oil pan front seal on
the cylinder front cover. Position the oil
pan rear seal on the rear main bearing cap.
Install the oil pan and related parts. Install
the oil level dipstick.
13. Fill the crankcase.
Start the
engine and check for oil pressure. Operate
the engine at fast idle and check for oil
leaks.
CONNECTING ROD BEARINGS
The connecting rod bearings are
selective fit. Refer to procedures under
Fitting Main and Connecting Rod Bearings
on page
8.
· 33
.
REMOVAL
1. Drain the crankcase. Remove the
oil level dipstick. Remove the oil pan and
related parts.
2.
Remove the oil pump and inlet
tube assembly.
3. Tum the crankshaft until the
connecting rod to which new bearings are
to be fitted is
down.
Remove the
connecting rod
cap.
Remove the bearing
inserts from the rod and cap.
INSTALLATION
1. Be sure the bearing inserts and the
bearing bore in the connecting rod and cap
are clean. Foreign material under the
inserts will distort the bearing and cause a
failure.
2.
Clean the crankshaft journal.
3.
Install the bearing inserts in the
connecting rod and cap with the tangs
fitting in the slots
provided.
4.
Pull the connecting rod assembly
down frrmly on the crankshaft journal.
5. Select fit the bearing following
procedures
under
Fitting Main
and
Connecting Rod Bearings on page
8-33..
6.
After the bearing has been fitted,
clean and apply a light coat of engine oil
to the journal and
bearings.
Install the
connecting rod cap. Torque the nuts to
specifications.
7. Clean the oil pump inlet tube
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