Yanmar 3TNV82A-B, Service Manual

Page: 310 / 394

LUBRICATION SYSTEM
9-12
TNV DI Service Manual
Trochoid Oil Pump
Check Outer Rotor Side Clearance
Determine the side clearance of the outer rotor
across the pump cavity. While pressing down on
the outer rotor, measure the depression using a
depth micrometer (Figure 9-10).
Figure 9-10
Record the measurement(s) and see Outer Rotor
Outside Clearance on page 9-6 for the service
limits.
Check Inner Rotor and Gear Boss
Clearance
Using appropriate measuring instruments, measure
the outside dimensions of the crankshaft gear boss
and the inside dimensions of the inner rotor
(Figure 9-11).
1 – Crank Gear
2 – Inner Rotor
3 – Inside Width Across Flats of Inner Rotor
4 – Overall Inside Diameter of Inner Rotor
5 – Outside Width Across Flats of Gear Boss
6 – Overall Outside Diameter of Gear Boss
Figure 9-11
Record the measurement(s) and see Inner Rotor
and Gear Boss Clearance <Multiple tooth trochoid
type 3TNV82A - 4TNV88> on page 9-7 for the
service limits.
Reassembly of Oil Pump
1. Lubricate the outer rotor (Figure 9-12, (1)),
inner rotor (Figure 9-12, (2)) and pump bore in
the gear case cover with clean engine oil.
Figure 9-12
2. Reinstall the outer rotor in the gear case. The
dot mark on the face of the outer rotor must
face up toward the oil pump cover.
3. Reinstall the inner rotor into the gear case cover
with the dot mark also facing up. Make sure that
the pilot on the back side of the inner rotor fits
into the bore in the gear case cover and the top
surface of the inner rotor is flush with the top
surface of the outer rotor.
4. Reinstall the oil pressure regulator valve into
the oil pump cover. Apply LOCTITE® 242 (red)
to the valve plug. (Follow LOCTITE package
instructions.)
5. Reinstall the oil pump cover (Figure 9-12, (3)).
Apply LOCTITE 290 (green) or LOCTITE 262
(red) to the oil pump cover screws. (Follow
LOCTITE package instructions.) Tighten the
pump cover screws to 61 ± 13 in·lb
(6.9 ± 1.5 N·m, 0.7 ± 0.15 kgf·m).
10
15
20
25
0001152
0000076A
(1)
(3)
(4)
(2)
(6)
(5)
0000044A
(3)
(1)
(2)
(4)
(5)
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