Service Manual

LUBRICATION SYSTEM 6-7
Oil Pump, Relief Valve
Oil Pump, Relief Valve Removal
•
Remove the crankcase cover (see Camshaft/Crankshaft chapter).
•
Unscrew the mounting bolts and remove the oil pump parts assembly
(pump gear, pump cover plate, pump shaft, pins and rotors).
•
Take off the relief valve spring and ball.
•
Disassemble the pump parts assembly.
[A] Pins
[B] Pump Gear
[C] Mounting Bolts
[D] Outer Rotor
[E] Inner Rotor
[F] Pump Shaft
[G] Relief Valve Ball
[H] Spring
[I] Pump Cover Plate
[J] 6 mm dia Hole
Oil Pump, Relief Valve Installation
•
Fill the rotor housing with engine oil for initial lubrication.
•
Install the relief valve ball and spring in position, then install the pump
parts assembly in the crankcase cover.
NOTE

When Installing the pump parts assembly, align the 6 mm dia hole
[A] on the cover plate with center of the relief valve.
•
Install the mounting bolts and tighten them.
Torque - Oil Pump Cover Plate Mounting Bolts : 5.9 N 1 m (0.60 kgf
1 m,
52 in
1 lb)
Oil Pump, Relief Valve Inspection
•
Remove the oil pump (see Oil Pump, Relief Valve Removal).
•
Visually inspect the pump gear, outer and inner rotor, and cover plate.
If there is any damage or uneven wear, replace them.

Check the clearance [A] between the inner and outer rotor with a
feeler gauge. Measure the clearance between the high point of the
inner rotor and the high point of the outer rotor.
If the measurement exceed the service limit, replace the rotors as a
set.
Inner and Outer Rotor Clearance
Service Limit: 0.2 mm(0.008 in.)
•
Measure the outside diameter [A] of the outer rotor with a micrometer
at several points.
If the rotor diameter is less than the service limit, replace both the
inner and outer rotor.
Outer Rotor Outside Diameter
Service Limit: 40.470 mm(1.5933 in.)
•
Measure the thickness [B] of the outer rotor with a micrometer at
several points
If the rotor thickness is less than the service limit, replace both the
inner and outer rotor.
Outer Rotor Thickness
Service Limit: 9.830 mm (0.3870 in.)