CYLINDER
BLOCK
SERVICE
Gearcase
Check the gearcase body for cracks and damage, and the oil
seal for damage. Also check the governor related parts. If the
camshaft thrust plug press-fitted in the gearcase has been
worn or damaged, install a new thrust plug.
PRESS-FIT
HEIGHT
OF
CAMSHAFT
THRUST
PLUG
22
±
0.4
Timing
Gears
and
Lube
Oil
Pump
Gear
Check each gear for poor contact, wear and damage. If there
is any, replace the gear. Also check the splined bore
of
the
lube oil pump gear for faults.
Camshaft
Measure the clearance between the center journal and the
cylinder block, and between the rear journal and the cylinder
block. If either
or
both clearances are excessive, replace the
camshaft, front bushing or cylinder block. Replace the
camshaft
if the cam surface is damaged
or
the cam lobe is
badly worn.
MEASURING
CAM
LOBE
HEIGHT'
Fuel
Injection
Pump
Camshaft
Replace the camshaft
if
the cam surface
is
excessively worn
or
damaged or if the Oldham's coupling is damaged.
MEASURING
INJECTION
PUMP
CAMSHAFT
LOBE
Ball
Bearings
Check each ball bearing for excessive wear or damage and
for irregular
or
noisy rotation. If there is any, replace the
bearing.
Tappets
1. Check the bottom
of
each tappet for cracks, flaking and
nicks. If any
of
these conditions exist, replace the tappet.
2. Check the clearance between each tappet and the cylinder
block. If any clearance exceeds the specified limit,
replace the tappet.
Push
Rods
1. Replace a push rod if both its ends are excessively worn.
2. Place each push rod on a surface plate and check for
bending at the center
of
the rod. If the bend exceeds the
specified limit, correct or replace the rod.
REASSEMBLY
A
CAUTION:
Clean
each
part
sufficiently.
Clean
oil
passages,
sliding
surfaces
and
rotating
parts
with
spe-
cial
care.
Before
assembling,
apply
engine
oil
to
all
sliding,
rotat-
ing
and
press
fit
parts
such
as
bearings
and
cylinder
inner
walls.
Replace
gaskets,
packings
and
oil
seals
with
new
ones.
Apply
sealant
to
gaskets
and
packings,
and
to
the
spec-
ified
sealing
points.
Observe
tightening
torque
and
sequence
where
speci-
fied.
For
other
parts,
tighten
to
the
torque
for
ordinary
screws
or
bolts
as
the
torque
table
specifies.
Check
clearances
and
end
plays
during
assembly
work.
Engines & Generators
26
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