Checking The Oil Pump - Yamaha YBR250 2007 Service Manual

OIL PUMP AND BALANCER GEAR
1
2
3
c

CHECKING THE OIL PUMP

1. Check:
2. Measure:
b
a
1 Inner rotor
2 Outer rotor
3 Oil pump housing
3. Check:
5-51
• oil pump gear
Cracks/Damage/Wear --> Replace the
damaged part(s).
• clearance a between the outer rotor and the
inner rotor
• clearance b between the outer rotor and the
oil pump crankcase
• clearance c between the oil pump
crankcase and the inner and outer rotors
Out of specification --> Replace the oil
pump.
Clearance between the outer rotor
and inner rotor
0.15 mm (0.006 in)
<Limit.>: 0.2 mm (0.008 in)
Clearance between the outer rotor
and the oil pump crankcase
0.10 ~ 0.15 mm (0.004 ~0.006 in)
<Limit>: 0.20 mm (0.008 in)
Clearance between the oil pump
housing and the inner and outer
rotors
0.04 ~ 0.09 mm
(0.0016 ~ 0.0035 in)
<Limit>: 0.15 mm ( 0.006 in)
• oil pump operation
Improper movement --> Repeat steps 1 and
2 or replace the damaged part(s).
ENG