Yamaha YFM25RSEY Automobile User Manual


 
OIL PUMP
5-40
EAS24940
REMOVING THE OIL PUMP
1. Straighten the lock washer tab.
2. Remove:
Balancer weight gear nut
Lock washer
Balancer weight gear
TIP
Place the aluminium plate “a” between bal-
ancer drive gear “1” and balancer weight gear
“2”, and then loosen the balancer weight gear
nut “3”.
3. Remove:
Oil pump assembly
EAS24960
CHECKING THE OIL PUMP
1. Check:
Oil pump driven gear
Oil pump housing
Oil pump cover
Cracks/damage/wear Replace the
defective part(s).
2. Measure:
Inner-rotor-to-outer-rotor-tip clearance “a”
Outer-rotor-to-oil-pump-housing clear-
ance “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).
EAS4D3F015
CHECKING THE BALANCER WEIGHT
GEAR
1. Check:
Balancer weight gear
Buffer boss
Inner-rotor-to-outer-rotor-tip
clearance
0.15 mm (0.0059 in)
Limit
0.23 mm (0.0091 in)
Outer-rotor-to-oil-pump-hous-
ing clearance
0.100–0.151 mm (0.0039–
0.0059 in)
Limit
0.22 mm (0.0087 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.04–0.09 mm (0.0016–0.0035
in)
Limit
0.16 mm (0.0063 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing