7-16 ENGINE LUBRICATION SYSTEM
Relief Valve Inspection
Split the crankcase (see Crankshaft/Transmission chap-
Remove the relief valve [A] from the oil pump [B].
Check to see if 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 spring pressure.
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
compressed air in a well-ventilated area.
Take care that there is no spark or flame anywhere near
the working area.
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.