What Causes High Engine Oil Pressure?
2 Answers
High engine oil pressure can be caused by the following reasons: Clogged oil fine filter: When the filter element of the oil fine filter becomes excessively dirty, it can block the oil circuit, leading to excessive pressure in the main oil passage. Therefore, the oil fine filter should be cleaned regularly. Pressure relief valve clogged or improperly adjusted: If the pressure relief valve gets stuck due to sludge buildup, the oil pressure in the oil passage increases. Additionally, if the spring tension of the pressure relief valve is adjusted too high, the oil pressure may exceed the specified value without releasing, resulting in excessively high oil pressure in the system. Hence, it is necessary to adjust the pressure relief valve according to specifications and clean it periodically. Excessive oil viscosity: The viscosity of engine oil is related to the engine temperature. When the temperature is too high, the viscosity decreases; conversely, when the temperature is low, the viscosity increases.
Let me tell you about high oil pressure issues. The most common cause is using oil that's too thick, especially during cold winter starts when the oil can't flow properly and the pressure spikes. Another often overlooked problem is a clogged oil filter – I've seen many cars with pressure gauges hitting red due to poor oil return caused by cheap filters. Then there's the oil pump's pressure relief valve getting stuck – I've fixed several vehicles where the valve spring rusted shut, causing the pump to force excessive oil into the engine. Also, pay special attention to recently overhauled engines – bearing clearances set too tight can restrict oil flow. Finally, here's something easily missed – a high pressure reading doesn't always mean actual high pressure; a faulty sensor can give false readings. If you notice abnormal oil pressure, shut down immediately and investigate, or you might be looking at an engine rebuild from cylinder scoring!
