I am not sure whats going on, but my oil pressure was always sitting about 1/3 of the way up, then, just recently it would drop all the way down and the light will come on when I brake, reverse, or idle while the trans is in drive. Put it in park and it was fine. Then for a few days, anytime I made a right hand turn, or even went around a right curve, the oil pressure would bottom out, and the light would come on. Going left or straight made it rise. Today, it is just bottomed out, and the light is on. If I go left it may rise a little, but not even to the L mark. Someone mentioned something about a screen. I am not sure what they were talking about, but I was just going to replace the oil pump, and check the sensor. But it is a pretty strange problem. Thanks.
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Well theres no easy way but the tick marks HAVE to be set to top dead center with cylinder 1. Guess wondering since the oil pump sits in the oil pan why you tore the timing chain off? Assume you were over hauling the chain since it had high miles. All I can say if it was at top dead b4 you started cant think anything you could done for it not to go back to top center. Just keep trying walk away from it when you get really ticked off. Had a GM done that on me took 3 days going at it back and forth but i finally got it to line up to #1
Does it run? Oil will drain back out of many filters when they sit three months, unless the filter is located such that the open end sit upward to the sky. Do you have a oil pressure gauge? Does it show normal pressure when running?
gear box / transfer case filler plugs are about 1/2 way up the side of the unit. The lower plug (probably 1" lower is the oil level hole.. So remove the upper plug and fill till the oil runs out of the lower hole. Replace both plugs. The oil used should be a 80-90 oep oil
I assume there are no oil leaks on the motor that could be contributing to loss of oil pressure.
I would have the engine oil pressure checked by a mechanic with an independent oil pressure gauge to see what might be going on. I would want to do this on a cold engine and also after the motor has been operating for a while and the oil is quite hot. ( I would also immediately be replacing the oil filter in case there is some blockage problem there. I very much doubt it but I would be doing that anyway just to be sure as it is simple and cheap to do. You say the oil level in the motor is correct and that it has been recently changed).
If there was a problem with the oil pressure sender unit I suspect you would have more frequent symptoms than you have indicated.
If the oil pump was faulty I believe you should also be getting more frequent symptoms.
It could be that the oil pressure relief valve is intermittently temporarily sticking in the open position and the pressure then being generated by the oil pump is insufficient to reach the minimum level. The warning light then illuminates.
maybe the gauge iznt workin rite-hope so youd have to bring it for a pressure test on the block-pumps last because theyre always lubricated but not forever if u take of a valve cover and itz spitten oil that mite make u feel better