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8-34
firmly with the thumb at the center
of the seal, then press both ends of
the seal into the groove working
from the ends to the center.
Position the seal forming tool as
shown in Fig. 32 and complete the
seal installation. After installation,
cut the ends of the seal flush.
Apply a thin coating of oil resist-
ant sealer to the rear main bearing
cap at the rear of the top mating
surface (Fig. 32 ). Do not
apply
sealer to the area forward of the
oil slinger groove.
The upper oil seal in the block
cannot be replaced with the crank-
shaft
installed.
15. After the bearing has been
fitted, apply a light coat of engine
oil to the journal and bearings, then
install the bearing
cap.
Torque the
cap bolts to specifications.
16. Repeat the procedure for the
remaining bearings that require re-
placement.
17. If the thrust bearing cap
(No. 5 main beating) has been re-
moved, install it as follows:
Install the thrust bea,ring cap with
the bolts finger-tight. Pry the crank-
shaft forward against the thrust sur-
face of the upper half of the bearing
FIG. 32
-Seal to Rear
Bearing Cap Installation
(Fig. 47). Hold the crankshaft for-
ward and pry the thrust bearing cap
to the rear (Fig. 47). This will align
the thrust surfaces of both halves of
the bearing. Retain the forward pres-
sure on the
crankshaft.
Torque the
cap bolts to specification.
18. Clean the oil pump inlet tube
screen.
Prime the oil pump; then
install the oil pump and the inlet
tube
assembly.
GROUP 8-
ENGINE
19. 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.
20. Fill the
crankcase.
Start the
engine and check for oil pressure.
Operate the engine at fast idle and
check for oil
leak~.
CONNECTING ROD BEARING
1. Follow steps 1 and 2 under
Main Bearing Replacement.
2. Turn the crankshaft until the
connecting rod to which new bear-
ings are to be fitted is down. Remove
the connecting rod cap. Remove the
bearing inserts from the rod and
cap.
3. Be sure the bearing inserts and
the bearing bore in the connecting
rod and cap are clean. Foreign mate-
rial under the inserts will distort the
bearing and cause a failure.
4. Clean the crankshaft journal.
5. Install the bearing inserts in
the connecting rod and cap with the
tangs fitting in the slot provided.
6. Pull the connecting rod assem-
bly down firmly on the crankshaft
journal.
7. Place a
.
piece of Plastigage on
the lower bearing surface, the full
width of the cap and about
1
-4 inch
off center.
8. Install the cap and torque the
connecting rod nuts to specification.
Do
not tum the crankshaft while
the Plastigage Is
in
place.
9. Remove the cap; then, using
the
Plastigage
scale,
check
the
width
of
the
Plastigage.
When
checking the width of the Plastigage,
check at the widest point in order
to
get
the
minimum
clearance.
Check at the narrowest point in
order to get the maximum clearance.
The difference between the two
readings is the taper.
10. If the clearance is less than
the specified limits, try two red bear-
ing halves or a combination of red
and blue depending upon the con-
dition.
If the clearance exceeds the spe-
cified limits, try 0.002 inch under-
size bearings in combination with
blue "or red bearings. The bearing
clearance must be within specified
Umits
•.
If
proper clearance cannot · be
achieved with standard or 0.002
undersize bearings, the crankshaft
will have to be ground undersize and
fitted with undersize bearings.
After the bearing has been fit-
ted, clean and apply a light coat of
engine oil to the journal and bear-
ings. Install the connecting rod cap.
Torque the nuts to specifications.
11. Repeat the procedure for the
remaining connecting rods that re-
quire new bearings.
12. Follow steps 18 through 20
under Main Bearing Replacement.
NOTCH TO FRONT OF ENGINE
FIG. 33
.-Piston
Installation
CLEANING AND INSPECDON
Refer to page 8 -18 for the cleaning
and inspection procedures.
PISTONS AND
CONNECTING RODS
REMOVAL
1. Drain the cooling system and
the
crankcase.
2. Refer to Cylinder Head Re-
moval and remove the cylinder
head and related parts.
3. Remove the oil pan and related
parts. Remove the oil pump inlet
tube and the oil
pump.
4. Turn the crankshaft until the
piston to be removed is at the bot-
tom of its travel and place a cloth
on the piston head to collect the cut-
tings. Remove any ridge and/ or de-
posits from the upper end of the
cylinder bores. Remove the cylinder
ridge with a ridge cutter. Follow the
instructions furnished by the tool
manufacturer.
Never cut into the
ring travel area in excess of 1/32
inch when removing ridges.
5. Make sure all the connecting
rod caps are marked so that they
can be installed in their original po-
sitions. Remove the connecting rod
cap.
6. Push the connecting rod and
piston assembly out the top of the
cylinder with the handle end of a
hammer. Avoid damage to the crank-
pin or the cylinder wall when re-
moving the piston and rod.
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