Service Manual

Oil Pump Inspection
1. Fit oil pump gear into cylinder block, then use a feeler
gauge to check clearance with body at points shown.
Driven gear A 0.410 – 0.675 mm (.0161 – .0266 in.)
B 0.130 – 0.175 mm (.0051 – .0069 in.)
Drive gear C 0.440 – 0.175 mm (.0173 – .0276 in.)
D 0.150 – 0.195 mm (.0059 – .0077 in.)
A
B
C
D
Figure 218
2. Use a straight edge and feeler gauge to check side
clearance at points shown.
Side clearance
Side clearance
Driven gear
Drive gear
Driven gear 0.06 – 0.12 mm (.0024 – .0047 in.)
Drive gear 0.07 – 0.14 mm (.0027 – .0055 in.)
3. There should be no uneven wear on contact surfaces
of cylinder block or pump gear side of oil pump cover.
Figure 219
Oil Pump Installation
1. Apply engine oil to oil pump driven gear and install it
on counterbalance shaft so timing mark is in
position
shown.
Timing mark
Figure 220
2. Remove plug on left side of cylinder block and insert
a
8 mm (.31 in.) diameter rod into hole to act as a stopper
for counterbalance shaft. Tighten flange bolt to specified
torque.
Figure 221
Liquid Cooled Gas Engine
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Workman 3000/4000 Series