OF
ROD
TO PERMIT
)I
1;
\\
1/16"OIL
GROOVE
CONNECTING
ROD
BUSHINGS
BE FLUSH WITH
SIDES
BEARING
A881
Rev.
CROSS-S
ECTl ON
MEASURE CLEARANCE IN
DIRECTION INDICATED BY
ARROW
FIGURE
56.
CONNECTING
ROD
BUSHINGS
ASSEMBLY AND INSTALLATION
1. Install connecting rods on each piston with pins
and retaining rings. If new bushings were in-
stalled, check to see that ends are flush with
connecting rod to provide foroil recess in center.
2. Install all rings on each piston. All compression
rings will be marked
top
or identified in some
other manner. Place this mark toward closed end
of piston. Space ring gaps 1/4 of way around
piston from one another. No gap should be in line
with the piston pin.
3.
Position a bearing half in each connecting rod. Be
sure there is no dirt under bearing. This could
cause high spots and early bearing failure.
4. Oil cylinder walls. Install each piston in proper
,cylinder using a suitable installer. Each assembly
should be installed with stamp on piston facing
same direction as when removed.
5.
Position each connecting rod on crankshaft, oil
the journal, and install its rod cap with bearing
half. When installing rod cap, position
so
raised
witness mark on forging matches mark on con-
necting rod. See Figure 57.
i
'
6.
Tighten cap screws to specjfied torque.
7.
Crank engine over by hand to see that all bearings
8.
Install oil base with a new gasket.
9.
Install cylinder heads using proper bolt tighten-
are free.
ing sequence.
10.
Replace
oil.
CAMSHAFT
The camshaft is a one-piece machine casting, driven
through gears by the crankshaft. It rides on sleeve
bearings pressed into the crankcase.
In addition to providing a means of opening and
closing the valves, the camshaft operates the injec-
tion pump and fuel transfer pump.
?i5
FIGURE
57.
CONNECTING ROD CAP
Removal:
1.
Remove rocker arms and push rods from valve
chambers.
2. Remove injection pump and fuel transfer pump
from engine.
3.
Remove crankshaft gear retaining washer by
removing lock ring on crankshaft.
4. Lay engine on its side to avoid dropping tappets
and remove camshaft assembly as a group.
If
necessary, pry
it
out with a screwdriver between
camshaft gear and crankcase.
5.
Remove valve tappets. These can be removed
only from the camshaft end of the push rod holes.
Repair:
If
a lobe has become slightly scored, dress it
smooth with
a
fine stone. If the camshaft is badly
worn orscored, replace it. After installing a new cam-
shaft, retime the injection pump to the engine. Never
install a new camshaft with old tappets.
Camshaft Gear.
This gear is a pressed fit on the
camshaft and drives it at 1/2 the crankshaft speed. To
remove the gear, use a hollow tool or pipe that will
fit
inside the gear bore and overthe center pin. Press the
camshaft out of the gear bore. Be careful not to
damage the center pin.
Camshaft Bearings:
The camshaft bearings should
be replaced if the clearance to the camshaft is greater'
.
than specified, the bearings show cracks, breaks,
burrs, excessive wear, or other defects.
To
check the
rear bearing, remove the expansion plug at the rear of
the crankcase.
Redistribution or publication of this document,
by any means, is strictly prohibited.
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