Yamaha XV19SX(C), Service Manual

Page: 352 / 494

OIL PUMP
5-103
EAS24960
CHECKING THE OIL PUMP
1. Check:
• Oil pump housing
• Oil pump housing cover
Cracks/damage/wear
→
Replace the defec-
tive part(s).
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance “a”
• Outer-rotor-to-oil-pump-housing clearance
“b”
• Oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance “c”
Out of specification
→
Replace the oil pump.
3. Check:
• Oil pump operation
Rough movement
→
Repeat steps (1) and
(2) or replace the defective part(s).
EAS24970
CHECKING THE RELIEF VALVE
1. Check:
• Relief valve body
• Relief valve
• Relief valve spring
Damage/wear
→
Replace the defective
part(s).
ET1D71035
CHECKING THE BALL SPRING AND RELIEF
VALVE SPRING
1. Measure:
• Ball spring free length
• Relief valve spring free length
Out of specification
→
Replace the defective
part(s).
Inner-rotor-to-outer-rotor-tip
clearance
Less than 0.12 mm (0.0047 in)
Limit
0.20 mm (0.0079 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.06–0.13 mm (0.0024–0.0051 in)
Limit
0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing
clearance
0.09–0.19 mm (0.0035–0.0075 in)
Limit
0.26 mm (0.0102 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing
Ball spring
Free length
34.70 mm (1.37 in)
Limit
32.97 mm (1.30 in)
Relief valve spring
Free length
28.95 mm (1.14 in)
Limit
27.50 mm (1.08 in)
a. Free length