PRESS
BEARING
FLUSH WITH
BOTTOM
OF
RECESS
REAR
EARING
PRESS
BEARING
FLUSH WITH
FRONT CRANK-
CASE SURFACE
ALIGN
OIL
HOLES
FRONT
BEAR1 NG
BEAR
I
NG
PRESS
BEARING
FLUSH WITH
FRONT CRANK-
CASE SURFACE
BEAR
I
NG
FIGURE
58.
CAMSHAFT BEARINGS
FIGURE
59.
CAMSHAFT ENDPLAY
WHEN INSTALLING
TIMING GEARS
-v-!
.
FIGURE
60.
TIMING
MARKS
Press new bearings into place, Figure
58.
Press the
rear bearing flush with the bottom of the expansion
plug recess. Press the front bearing in flush with the
crankcase front surface
so
the oil passages are
aligned.
Do
not attempt to ream the bearings as they
are a precision type. Afterthe rear bearing is installed,
insert a new expansion plug
in
the recess, using
sealing compound, and expand
it
into place with
sharp blows at its center.
Installation, Camshaft
Assembly:
1.
Install key and press camshaft gear on camshaft
until it bottoms on flange with no clearance.
2.
Install governor components.
3.
Slide thrust washer onto shaft. Measurecamshaft
end play; it should be
0.007
inch to
0.039
inch
(0.178
to
0.991
mm). See Figure
59.
4.
Lay engine on its side or end and insert push rod
tappets.
5.
Install camshaft assembly
in
engine. Align timing
marks
on
camshaft gear and crankshaft gear. See
Figure
60.
6.
Replace push rods and fuel transfer pump.
7.
When engine is reassembled, install injection
pump following the steps for lnjecfion
Pump
installation
in the
FUEL
SYSTEM
section. This
step is critical.
CRANKSHAFT
Onan diesel engines use a counter-balanced, ductile
iron crankshaft.
To
increasetheshaftfatiguedurabili-
ty, all crankpin fillets are shot-peened during
manufacture. The four-cylinder model uses an ad-
ditional split-center main bearing.
56
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by any means, is strictly prohibited.
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