Section 05 ENGINE (4-TEC)
Subsection 07 (LUBRICATION SYSTEM)
SMR2003-019_05_07A.FM 05-07-11
1. Pittings on the teeth
Using a feeler gauge, measure the clearance be-
tween inner and outer rotors.
1. Outer rotor
2. Inner rotor
If clearance between inner and outer rotors ex-
ceeds the tolerance, replace coolant/oil pump shaft
assembly. Ensure to also check oil pump housing
and cover and replace if damaged.
If clearance between outer rotor and its bore in oil
pump exceeds the tolerance, replace the complete
oil pump and the PTO housing.
Using a vernier depth gauge, measure side wear as
shown.
1. PTO housing surface
2. Vernier depth gauge
1. Oil pump outer rotor surface
2. Vernier depth gage
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 and replace if dam-
aged.
OUTER AND INNER ROTOR CLEARANCE
mm (in)
SERVICE LIMIT
A
0.25 mm (.009 in)B
C
1
R1503motr129A
2
R1503motr130A
1
C
A
B
1
R1503motr131A
2
R1503motr132A
12
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