Mercury 15 EFI FourStroke, Service Manual

Page: 212 / 406

2. Push the oil pump shaft out of the oil pump housing.
3. Remove the inner rotor and outer rotor from the oil pump housing.
4. Remove the pressure relief valve from its bore.
NOTE: Do not reuse the cover seal.
a - Oil pump housing
b - Cover seal
c - Outer rotor
d - Shaft
e - Drive pin
f - Inner rotor
g - Pressure relief spring
h - Pressure relief valve
Oil Pump Inspection
1. Inspect oil pump components for pitting or scratches. Replace if necessary.
2. Using a feeler gauge, measure the following oil pump clearances. Replace if worn or out of specification.
a
b
c
d
e
17941
Ref Measurement Location Specification
a. Outer rotor to pump housing (maximum) 0.18 mm (0.007 in.)
b. Inner rotor to outer rotor (maximum) 0.13 mm (0.005 in.)
c. Outer rotor to oil pump cover (maximum) 0.11 mm (0.004 in.)
d. Oil pump housing inside diameter (maximum) 29.15 mm (1.148 in.)
e. Outer rotor height (minimum) 14.96 mm (0.589 in.)
Oil Pump Assembly
1. Lubricate the oil pump components with clean engine oil.
2. Install the cover seal into the groove on the oil pump housing.
3. Install the outer rotor into the oil pump housing.
4. Install the inner rotor into the oil pump housing with the keyway facing towards the cover.
5. Install the drive pin into the shaft.
6. Install the shaft with the drive pin into the inner rotor. Ensure the drive pin engages with the inner rotor keyway.
a
b
c
d
e
64057
g
f
h
Oil Pump
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 4C-3