Inspection Of Oil Pump; Functional Limit - TOHATSU MFS 9.9 Owner's Manual

20) Inspection of Oil Pump

1. Use micrometer, cylinder gauge, depth gauge and thickness
gauge to measure dimensions shown below. Replace oil
pump if over specified value.

Functional Limit :

Clearance between Outer Rotor and Body a :
0.36 mm (0.0142 in)
Clearance between outer and inner rotors b :
0.16 mm (0.0063 in)
Side clearance between rotor and body c :
0.11 mm (0.0043 in) (including wear of oil pump cover)
Height of Outer Rotor d :
14.96 mm (0.5890 in)
Pump Body Inner Diameter e :
29.04 mm (1.1433in)
4st 9.9/15/20 2008
a
e
b
a
c
O-Ring
Pump Body
Outer Rotor
Inner Rotor
Shaft
Pin
Gasket
Oil Pump Cover
c
d
b
5
4st
4st OIL
M-635
5-37