They tell me that oil pumps don't really go bad that I should not spend time or money on it that is the Bering on crank shaft that go bad that's what make the pressure is this true . My truck runs and sounds good
No, You oil pump gives your oil pressure to flow through your engine to lubricate. This also lubricates your journal bearings for the crank and push rods, and if the pressure is low, can destroy these, as in also, worn bearings can affect oil flow. Once worn, these bearings will usually have a hollow knock. Get an oil pressure gauge hooked up to see what pressure you have.
No that is not exactly true, worn main engine crank bearings will drop the oil pressure as it leaks out the gap, but worn oil pumps will also cause the bearings to wear and then that makes the oil press drop problem worse. The bottom line here is that if you have an engine knock it is to late, the engine must be rebuilt and the oil pump is always replaced at that time.
SOURCE: My check oil pressure gauge came on. It was time
The 'check oil pressure' gauge indicates less than 5psi of oil pressure. This usually indicates either a oil pump pick-up screen is plugged up or the crank bearings are worn to the point that oil flow is not being restricted. Both require the removal of the oil pan to check for the problem.
SOURCE: 1987 chevy s10 2.5l tbi will not start. changed
That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.
SOURCE: aggrivating cranking demon,
I'm not sure if your engine has hydraulic lifters or not. sorry, but if it does, then pumping them up might take a few cranks to build up oil pressure. I would check compression, cylinder leakage, to start. The more information you can get on the engine, the better. If the mixture is too rich BEFORE start up, it might take a few cranks to get fresh air charge into the intake header before right mixture is present for fireup.
Testimonial: "I believe it does have hydraulic lifters, never thought to check compression being it started giving me hell overnight. But ill give it a try. Thanks!"
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