Chapter 2 Basic Engine
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3,4]H3(B)(C)E
7.
Timing Gear
The timing gear is helical type for minimum noise and spe-
cially treated for high durability.
Fuel
injection
pump
gear
Lubricating
oil
pump
gear
No.
of
teeth
Face
width
Spiral
angle
Sea waler pump gear
31
12.0 right
Camshaft gear
56 18.0 left
Idle gear
43 18.0
right
Crankshaft gear
28
40.0
left
Lubricating oil pump gear
29
8.0
right
Idle gear
43 18.0
right
Fuel inJection pump gear
56 10.0 left
7-1 Inspecting the gears
(1) Inspect the gears and replace if the teeth are damaged
or worn.
(2}
Measure
the backlash
of
all
gears
that
mesh, and
replace the meshing gears as a set if wear exceeds
the limit.
NOTE: If backlash
is
excessive, it will not only result
in
excessive noise and gear damage, but also lead
to
bad
valve
and
fuel
injection timing
and
a
decrease
in
engine performance.
Camshaft gear
Crankshaft gear
mm
Center distance
Back
lash
Back
lash
Wear
limit
92.544~92.592
0.07~0.15
0.2
105.318~105.380
0.07~0.15
0.2
75.525~
75.573
0.07~0.15
0.2
60.629~60.677
0.11
~0.19
0.22
105.254~105.316
0.04~0.12
0.2
2-24
(3)
Idling gear
The bushing is pressure fitted into the idling gear.
Measure the bushing inner diameter and the outer diam-
eter of the shaft, and replace the bushing or idling gear
shaft if the oil clearance exceeds the wear limit.
A,
Band
Care
inscribed on the end of the idling gear.
When assembling, these marks should align with those
on the cylinder block.
Printed
in Japan
HINSHI-II8009
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