CONNECTING
ROD
BUSHINGS
BUSHING ENDS MUST
BE FLUSH WITH
SIDES
OF
ROD
TO PERMIT
I/lb”OlL
GROOVE
BETWEEN BUSHINGS
MEASURE CLEARANCE
IN
ABBl
Rev.
FIGURE
110.
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 con-
necting rod to provide for oil 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 oneanother. Nogapshould 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 and bearing
half. When installing rod cap, position
so
raised
witness mark on forging matches mark on con-
necting rod. See Figure
111.
6.
Tighten capscrews to specified 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 meansof opening and clos-
ing the valves,
the
camshaft operates the injection
pump and fuel transfer pump.
FIGURE
111.
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 using ascrewdriver 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 or scored, replace
it.
After installing a new cam-
shaft, time the injection pump to the engine. Never
install a new camshaft with old tappets.
Camshaft Gear:
This gear is a pressed fit on the cam-
shaft and drives
it
at 1/2 the crankshaft speed.
To
remove the gear, use a hollow tool or pipe that
will
fit
inside thegear boreand overthe center pin. Press the
camshaft out of the gear bore. Be careful not to dam-
age the center pin.
Camshaft Bearings:
The camshaft bearings should
be replaced if the clearance to thecamshaft 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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