Oil Pressure Relief Valve
Oil Pressure Relief Valve Removal/Installation
Split the crankcase (see Crankcase Splitting in the Crank-
Remove the relief valve [A] from the right crankcase.
Apply a non-permanent locking agent to the threads of
the relief valve, and tighten it.
Torque - Oil Pressure Relief Valve: 15 N·m (1.5 kgf·m, 11
Oil Pressure Relief Valve Inspection
Check to see if the steel ball [A] inside the valve slides
smoothly when pushing it in with a wooden or other soft
rod, and see if it comes back to its seat by valve spring
Inspect the valve in its assembled state. Disassembly
and assembly may change the valve performance.
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
Clean the parts in a well-ventilated area, and take
care that there are no sparks or flame anywhere
near the working area. 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 as an assembly. The relief valve is precision made
with no allowance for replacement of individual parts.
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ENGINE LUBRICATION SYSTEM 7-9