Re: 1940 110 Touring Sedan Irregular Oil Pressure

Posted by TxGoat On 2023/5/8 22:52:00

You may have a problem with the oil pressure limiter, which I think is built into the oil pump body. That's the first thing I'd check.

The fit of oil pump parts is critical, and gaskets of the wrong thickness might cause excess clearance and low oil pressure.

A problem with the oil pump suction screen assembly, such as a leak in the pickup tube, could cause low or erratic oil pressure.

A badly worn engine will have low oil pressure. Such engines usually exhibit excess mechanical noises and excess crankcase blowby, especially when warmed up.

Oil burning that is limited to one cylinder may be a broken ring, but it could also be stuck rings or a clogged oil ring. An ignition problem affecting one cylinder can mimic an oil control problem.

Any condition that allows excess oil to accumulate in the valve guide area may cause oil burning. That problem is more common in overhead valve engines, but it can affect any engine.

Another thing to check is the fuel pump. If it is the type that has a vacuum booster built into it to assist the windshield wipers, a bad vacuum diaphragfm can allow crankcase oil to be sucked into the intake manifold. This could cause cause fouling of one or more spark plugs. It would not affect oil pressure. Also, be sure the fuel pump is not leaking gasoline into the crankcase. That could cause low oil pressure. Your crankcasae oil should not smell like gasoline.