4. Mount and secure rear bearing plate.
Crankcase
5.
Heat timing gear
on an
electric burner or oven to
about
35OOF
(175°C).
Install
key on crankshaft,
then drivegear into place. Install retaining washer
and lock ring.
6.
Set upper half of center main housing on crank-
shaft and rotate it into place. See Figure 118. Be
sure it is installed with the side marked
front
toward crankshaft gear. Set the two positioning
dowels on the upper bearing mount. Install center
main bearing capand torque bolts to97-102ft.-lb.
(131-138 Nm).
7.
Check crankshaft end play. Use enough rear
bearing plate shims and gaskets to provide
0.010
inch (0.254 mm) to
0.015
inch (0.381 mm) end
play. If gaskets of more than 0.015 inch (0.381)
total thickness are required, 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.
If
the
crankcase requires replacement, a new set of
injection pump shims
will
be furnished with the new
crankcase. These must be used and, in addition,
the
injection pump must be re-timed to the engine. If, on
the four cylinder models, the center main bearing
support requires replacement, the whole crankcase
must be replaced or returned to the factory to have a
new housing fitted.
Break-In Period
Whenever new rings or pistons are installed or the
cylinder refinished, the engine must be run-in before
regular operation can be resumed. Run
the
engine for
15 to
20
minutes at no load, about
30
minutes at 1/3
load, and
2
to 3 hours at 2/3 load. Regular operation
can then be resumed. Avoid light load operation dur-
ing the following several hours for best ring seating
and to prevent oil consumption.
8. Install
.
*-
piston assemblies.
BEARING HALF
PLACE UPPER BEARING
HOUSl
HALF IN POSITION INDICATED
CRANKSHAFT BROKEN LINE. ROTATE INTO
BEARING HALF CENTER
MAIN
BEARING
HOUSING (UPPER HALR
BE
SURE
TO
ALIGN
OIL
HOLES
IN
BEARING AND
HOUSING
ING
BY
FIGURE
118.
CENTER MAIN
BEARING
HOUSING
87
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