Re: Oil Pump Rebuilding Options?

Posted by TxGoat On 2024/6/25 8:52:33

I doubt if the lockwashers under the spring are stock. It is likely that flat washers were originally used to set the pressure at which the relief valve would open. I'd replace the lockwashers with flat washers of the same thickness or just a little thicker. The washers should not affect idle oil pressure, unless the piston/valve is not seating fully. 10W40 conventional oil is a good choice. 20/50 might give better results in an engine with some wear. For summer driving, I'd add a pint of STP and see if that boosts the oil pressure at hot idle a little. 2 pints will do no harm in warm weather in 10/40 oil. Don't overfill the crank case. The oil pump cover does not look excessively worn to me. The oil pressure relief is primarily intended to prevent excessive oil pressure on a cold start. It will not affect oil pressure at hot idle unless is is sticking or leaking. On the other hand, limiting flow to the bypass oil filter as discussed above could raise oil pressure at hot idle. Also, be sure your idle speed is at or slightly above spec.