Reassembly Of Oil Pump - Yanmar 3TNV82A Service Manual

Trochoid Oil Pump
Outer Rotor to Inner Rotor Tip Clearance
Determine the outer rotor to inner rotor tip
clearance. Insert a feeler gauge between the top of
an inner rotor tooth (Figure 9-18, (1)) and the top
of an outer rotor tooth (Figure 9-18, (2)) and
measure the clearance.
(2)
Figure 9-18
Record the measurement(s) and see Outer Rotor
to Inner Rotor Tip Clearance on page 9-11 for the
service limits.
Check Outer Rotor Side Clearance
Determine the side clearance of the outer rotor
across the pump cavity. Measure the depression
using a depth micrometer (Figure 9-19, (1)).
Figure 9-19
Record the measurement(s) and see Check Outer
Rotor Side Clearance on page 9-12 for the service
limits.
TNV DI Service Manual
(1)
0001153A
(1)
0001615A
LUBRICATION SYSTEM
Check Rotor Shaft Clearance
Determine the rotor shaft clearance. Measure the
outside diameter of the rotor shaft
(Figure 9-20, (1)) and the bore diameter in the gear
case housing (Figure 9-20, (2)).
Calculate the difference between the two
measurements to determine the clearance.
(1)
Figure 9-20
Record the measurement(s) and see Rotor Shaft
Clearance - 4TNV94L to 4TNV106T on page 9-7
for the service limits.

Reassembly of Oil Pump

1. Lubricate the outer rotor and pump bore in the
gear case with clean engine oil.
2. Reinstall the outer rotor in the gear case
housing. The punch mark (Figure 9-21, (1)) on
the end of the outer rotor must face away from
the gear case housing (Figure 9-21, (2)).
1
Figure 9-21
(2)
0000047A
2
0000048A
9-15