Service Manual

6-10 LUBRICATION SYSTEM
Oil Pump, Relief Valve
•
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 with new ones.
Outer Rotor Outside Diameter
Service Limit: 52.31 mm (2.059 in.)
•
Measure the thickness [B] of the outer rotor with a mi-
crometer at several points.
If the rotor thickness is less than the service limit, replace
both the inner and outer rotor with new ones.
Outer Rotor Thickness
Service Limit: 14.91 mm (0.5870 in.)
•
Measure the inside diameter [A] of the pump housing with
a inside micrometer at several points.
If th
e inside diameter is more than the service limit, re-
place the crankcase cover with a new one.
Pump Housing Inside Diameter
Service Limit: 52.721 mm (2.0756 in.)
•
Measure the depth [B] of the pump housing with a depth
micrometer at several points.
If any of measurement is more than the service limit, re-
place the crankcase cover with a new one.
Pump Housing Depth
Service Limit: 15.16 mm (0.5968 in.)
•
Visually inspect the relief valve spring, steel ball and valve
seat in the crankcase cover.
If any rough spot is found during above inspection, wash
the valve clean with a high-flash point solvent and blow
out any foreign particles on the valve with compressed
air.
WARNING
Clean the parts in a well ventilated area, and take
care that there is no spark or flame anywhere near
the working areas. Because of the danger of highly
flammable liquids, do not use gasoline or low-flash
point solvents.
If cleaning does not solve the problem, replace the relief
valve parts with new ones.
If necessary, put the ball in position and lightly tap the ball
with a suitable tool to form a perfect seat.
•
Measure the free length [A] of the spring with a vernier
caliper.
If the free length of the spring is less than the service limit,
replace the spring with a new one.
Relief Valve Spring Free Length
Service Limit: 20.4 mm (0.803 in.)