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ENG
OIL PUMP
INSPECTION
Oil pump
1. Inspect:
• Oil pump drive gear 1
• Oil pump drive shaft 2
• Rotor housing 3
• Oil pump cover 4
Cracks/wear/damage → Replace.
1
3
2
4
2. Measure:
• Tip clearance a
(between the inner rotor 1 and outer
rotor 2)
• Side clearance b
(between the outer rotor 2 and rotor
housing 3)
• Housing and rotor clearance c
(between the rotor housing 3 and rotors
1 2)
Out of specification → Replace the oil
pump assembly.
Tip clearance a:
0.12 mm or less
(0.0047 in or less)
<Limit>: 0.20 mm (0.008 in)
Side clearance b:
0.09 ~ 0.17 mm
(0.0035 ~ 0.0067 in)
<Limit>: 0.24 mm (0.009 in)
Housing and rotor clearance c:
0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)
<Limit>: 0.17 mm (0.0067 in)
3. Check:
• Unsmooth → Repeat steps #1 and #2 or
replace the defective parts.