Oil Pump Inspection; Oil Pump Reassembly - Mercury 25 EFI Service Manual

Oil Pump
4. Remove the inner and outer rotors from the oil pump body.
b
a
a - Oil pump seal (do not reuse)
b - Oil pump body
c - Outer rotor
d - Inner rotor
e - Oil pump shaft drive pin
f - Oil pump shaft
g - Oil pump cover seal (do not reuse)
h - Oil pump cover

Oil Pump Inspection

1. Inspect oil pump components for pitting and/or scratches. Replace if necessary.
2. Using a feeler gauge, measure the following oil pump clearances. Replace if worn or out of specification.
• Between the outer rotor and pump housing
• Between the inner rotor and outer rotor
• Between the outer rotor and oil pump cover
• Inside diameter of the oil pump housing
• Outer rotor height
Outer rotor and pump housing (maximum) "a"
Inner rotor and outer rotor (maximum) "b"
Outer rotor and oil pump cover (maximum) "c"
Oil pump housing inside diameter (maximum) "d"
Outer rotor height (minimum) "e"

Oil Pump Reassembly

1. Lubricate the rotor cavity of the oil pump with 2‑4‑C with PTFE.
2. Lubricate the outer rotor with 2‑4‑C with PTFE. Install the outer rotor into the oil pump body.
Page 4C-6
a
c
b
© 2016 Mercury Marine
f
e
d
c
d
Oil Pump Clearance
g
h
a - Outer rotor and pump
housing
b - Inner rotor and outer rotor
c - Outer rotor and oil pump
cover
e d - Oil pump housing inside
diameter
e - Outer rotor height
17941
0.25 mm (0.01 in.)
0.16 mm (0.006 in.)
0.11 mm (0.004 in.)
40.8 mm (1.606 in.)
14.96 mm (0.589 in.)
90-8M0105568 eng MARCH 2016
11563