Service Manual

6-8 LUBRICATION SYSTEM
Oil Pump, Relief Valve
•
Measure the inside diameter [A] of the pump housing with an inside
micrometer at several points.
If the inside diameter is more than the service limit, replace the
crankcase cover.
Pump Housing Inside Diameter
Service Limit: 40.801 mm (1.6063 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, replace the
crankcase cover.
Pump Housing Depth
Service Limit: 10.230 mm (0.4028 in.)
•
Measure the outside [A] diameter of the pump shaft with a micrometer
at several points.
If the diameter is less than the service limit, replace the pump shaft.
Pump Shaft Outside Diameter
Service Limit: 10.923 mm (0.4300 in.)
•
Measurer the inside diameter [A] of the pump shaft bearing in the
crankcase cover with a inside micrometer at several points.
If the inside diameter is more than the service limit replace the
crankcase cover.
Pump Shaft Bearing Inside Diameter
Service Limit: 11.072 mm (0.4359 in.)
•
Visually inspect the relief valve spring, steel ball and valve seat in the
crankcase cover.
If any rough spots are found during above inspection, wash the valve
clean with a high flash-point solvent and blow out any foreign particles
that may be in the valve with compressed air.
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.
If necessary, put the ball in position and lightly tap the ball with a
suitable tools to form a perfect seat.
•
Measure 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.
Relief Valve Spring Free Length
Service Limit: 19.50 mm (0.77 in.)