Main
Bearings: Replace main bearings if
clearances
are
greater than
limits,
or the bearings are
worn,
grooved or
broken.
Precision
replacement bearing inserts and thrust
washers
are available
for
all main bearings.
Do
not ream the bearings.
Align
the oil holes and
press
the new bearings
into
the
front
and rear housings.
Rear Oil
SeahThe
rear
oil
seal is in the.rear bearing plate.
If
damaged, drive it out
from
the inside of the plate. Using
the oil seal
installing
tool,
install
a new seal
with
the
rubber lip facing outward (open side of seal inward) Fig.
13-4.
Drive
the new seal
flush
with
the rear surface of the
bearing plate. Leave the seal installer on during bearing
plate
installation
to protect the
oil
seal.
Installation:
After
each installation step, check the crank-
shaft to be
sure
it is not
frozen
into
place.
1.
Press
the
front
and rear main bearings
into
place,
aligning
the bearing and bearing housing
oil
holes. Do
not
attempt to drive a bearing
into
a
cold
block or rear
bearing plate.
2.
Install
the thrust
washers
and
locking
pins.
3. Oil the bearing surfaces and
install
the crankshaft
from
the rear of the crankcase, through the rear bearing plate
hole.
4.
Mount
and
secure
the rear bearing plate.
5. Heat the
timing
gear
on an electric burner or oven to
about 350
o
F.
Install
the key on the crankshaft, then
drive
the
gear
into
place.
Install
the retaining washei
and
lock
ring.
6. Check the. crankshaft end play. Use enough rear
bearing plate
gaskets
or shim and
gaskets
to provide
.010"
to .015" end play. If
gaskets
of more than
.015"
total
thickness are required, then use a steel
shim
of proper thickness and a
thin
gasket on each side
of
shim. This avoids excessive gasket compression
and maintains
bolt
torque.
7.
Install
the piston assembly.
CRANKCASE
If
the crankcase requires replacement, a new set of injec-
tion-
pump
shims
will
be furnished
with
the new crankcase.
These
must be used, and in addition, the
injection
pump
must be retimed to the ehgine.
39
To Next Page
Loading...
Need help?
General
