Yanmar 4TNV98, Service Manual

Page: 218 / 246

4TNV98 & 4TNE98 Diesel Engine Section 6. Lubrication System 216
Disassembly of Oil Pump
CAUTION
If the oil pump must be replaced, replace it as an
assembly only. Do not replace individual
components.
Remove the engine cooling fan guard (if equipped),
engine cooling fan
(Figure 9-15, (3)) , spacer
(Figure 9-15, (2)) , engine coolant pump V-pulley
(Figure 9-15, (1)) and V-belt.
Figure 9-15
1. Remove the crankshaft pulley and the gear case
cover. See Removal of Timing Gear Case Cover
on page 111.
2. Remove the oil pump assembly bolts. Remove
the oil pump assembly (Figure 9-16, (1)) from the
gear case housing (Figure 9-16, (2)) .
Figure 9-16
Cleaning and Inspection
Wash the oil pump, oil pressure regulator and oil
pump cavity. Inspect for wear or damage. Replace
as necessary.
CAUTION
If any oil pump component clearance exceeds its
limit, the oil pump must be replaced as an
assembly.
Check Outer Rotor Outside Clearance
Determine the outside clearance of the outer rotor.
Insert a feeler gauge between the outer rotor
(Figure 9-17, (1)) and gear case oil pump cavity
(Figure 9-17, (2)) .
Figure 9-17
Record the measurement(s) and see Check Outer
Rotor Outside Clearance on page 236 for the
service limits.