Yamaha VK540EF, Service Manual, Page: 272 / 439

5-16
OIL PUMP, CRANKCASE AND CRANKSHAFT
ENG
4. Inspect:
Lower crankcase 1
Upper crankcase 2
Front left brackets 3
Front right brackets 4
Rear bracket 5
Dampers 6
Cracks / damage Replace.
5. Inspect:
Oil pump
Cracks / damage
Replace.
Oil hoses
Clogs / damage
Replace.
OIL PUMP STROKE ADJUSTMENT
1. Remove:
Oil pump cover 1
2. Wipe off the grease from the plunger top.
3. Measure:
Minimum pump stroke
a
Out of specification Adjust.
Minimum pump stroke
a
:
0.20 0.25 mm
(0.008 0.010 in)
Minimum pump stroke measurement steps:
Turn the pump worm gear 1 with your fin-
gers, until the plunger top 2 is at its maxi-
mum distance from the pump body mating
surface
3 of the pump cover.
Using a feeler gauge, measure the minimum
pump stroke
a
between the adjusting plate
4 and the raised boss 5 on the adjusting
pulley.
If minimum pump stroke is not with in the
specified limits, perform the adjustment
steps.