Section 03
ENGINE
Subsection 08
(LUBRICATION SYSTEM)
VMR2004_131_03_08A.FM
03-08-9
1. Outer rotor
2. Inner rotor
If clearance between inner and outer rotor ex-
ceeds the tolerance, replace oil pump shaft as-
sembly. Ensure to also check oil pump housing
and cover. If damaged, replace the complete oil
pump assembly.
If clearance between outer rotor and its bore in oil
pump exceeds the tolerance, replace the complete
oil pump assembly.
Using a dial indicator, measure side wear as shown.
1. Oil pump housing surface
2. Dial indicator
1. Oil pump outer rotor surface
2. Dial indicator
Difference between pump housing and outer rotor
should not exceed 0.1 mm (.004 in). If so, replace
replace the complete oil pump assembly.
NOTE:
When the axial clearance of the oil pump
shaft assembly increases, the oil pressure de-
creases.
Check the inside of oil pump housing and its cover
for scoring or other damages. If so, change the
complete oil pump assembly.
Installation
For installation, reverse the removal procedure.
Tightening oil pump housing screws as per follow-
ing sequence.
Install the O-ring
no. 27
on oil pump cover.
CAUTION:
Never apply any sealing compound
on split surfaces of oil pump.
Final Test
After engine is completely reassembled, start en-
gine and make sure oil pressure is within specifi-
cations.
OUTER AND INNER ROTOR CLEARANCE
mm (in)
SERVICE LIMIT
A
0.25 mm (.009 in)
B
C
B
R400motr127A
A
C
1
2
1
2
R400motr128B
1
2
R400motr128B
1
R400motr119B
3
2
4
