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Re: high oil pressure
It should be in the housing that the oil filter screws on to. it is mechanical, and kicks in when the oil filter gets blocked up. make shure you have the right oil filter. try putting on a new oil filter
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Remove the oil sender unit, fit a oil pressure gauge , start the engine and read the oil pressure at idle engine hot, must read above 10 psi and needle not flicking, must increase with engine speed , if pressure is ok replace censer, if not check oil pump screen and relief vale spring, can also be caused by crankshaft bearings clearance .
NOT LACK OF OIL AT ALL! FACTORY OIL PUMP OF AFTERMARKET HIGH VOLUME OIL PUMP? HOPEFULLY YOU INSTALLED DEFI GAUDE SENSOR IN PLACE OF OLD OIL PRESSURE SENSOR! ALSO OIL WEIGHT CAN AFFECT THIS ISSUE! AND LASTLY PRESSURE RELIEF VALVE MAY BE MALFUNCTIONING IN THE PUMP ITSELF
Hi Lee, There are two oil pressure relief valves on most vehicles. One is fitted onto the oil pump assembly and another onto the oil filter housing assembly. The oil pump pressure relief valve is located at the front of the engine and is accessed via a blind nut on the side of the unit. The bolt is in the form of a cap, which when removed can be seen to be holding down under tension a spring, which in turn presses the valve. If the pressure becomes too high the valve body is pushed upwards and releases an amount of oil, thereby maintaining the required pressure. The valve built into the oil filter housing works in much the same way, but its job is to allow oil circulation in the event of a blocked oil filter. regards John
Does it do this all the time or only when cold? (how cold is it?) If it only does this cold, it's normal as long as pressure does not go above that. If it also persists when at operating temp, change your oil filter and make sure it is the correct one. If due for an oil change, do it and add a good lubricating solvent such as Marvel oil, which will gently clean relief valve in pump and passageways. High oil pressure is actually a good thing but excessive pressure can cause the filter to explode or "blow" its seal. Then, you have more problems than anyone really needs!!! Good luck!!
There is a pressure relief valve in the oil pump, it is stuck closed, this happens now and then, seen it 2 times, since the oil pump is a positive displacement pump it can produce 100's of pounds of pressure, the reason for the noise is that u have allot OF pressure but very little volume, the bearings are being starved for lubrication, replace the oil pump, DO NOT DRIVE THE TRUCK, U WILL BURN OUT THE ROD AND CRANK BEARINGS.