I think the oil pump may have went out! if it was driven from work about 5 miles could it cause futher damage? how can I check this out? should I just put a new oil pump on and then seee if the knocking goes away or can it be checked for futher damage before putting oil pump on?
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Re: knocking sound from the motor 1995 300 se lexus
If you had 0 oil pressure driving that 5 miles, and it was nocking, chances are it is not going to go away, the damage has already been done. the only recourse here is total rebuild or replacement of engine or the very least rods and main bearings if it did not scar the crank, you might get away with new bearings. only way to know for sure is to drop pan, and wiggle rod cap and see how bad it is. , you will know when you find the bad one it will be looser than the rest. as far as the mains are concerned you have to take each one off to see if there scared. i guess the bottom line here is what do you want to spend, either way it not cheap.
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Knock for 40K Miles?
Suggest its time to replace the motor.
I would not have flushed the oil with that many miles; but you might have them change the oil and filter with a heavy weight oil if you had 5-30 try 20-30, if you had 10-30 try 20-50.
Stall after the oil change can be a co-incidence but check something was not knocked loose.
make sure your plastic coolant container mounted on inside right fender is at least half full. Keep your eye on the temp gauge and make sure the car doesn't overheat. These sensors are very touchy and sometimes cause a fault when actually there is no real problem. Also make sure you didn't knock loose the oil pressure sending unit connector, located near the oil filter. Happy Motoring!
should have done an engine flush before the oil change .as can be dirty filter at the oil pump. do it again ,but engine flush first. run the engine on tick over.but it sounds like the damage has been done .failed main bearings.
Lets review. Replacing the head at 250k was probably not a good investment. My advice has always been, if you need engine work at 200k or more, its
time for another vehicle because the rest of the parts are still worn
out. The normal life of a car or truck in the USA is 200k.
Usually a knocking sound means a rod or main bearing has failed. Which would require an engine overhaul to fix. Black oil has nothing to do with the pump. The oil should be changed at 500 miles to remove any debris caused by replacing the head. That may fix the problem if there is junk floating around in the oil pan. If the oil pump has failed, you would have very low oil pressure which would show up on a gauge. It could cost you more to fix the knock that it did to replace the head.
I had a chevy 2002 avalanche,2004 chevy tahoe both after 20,000 miles developed a mild lifter or slight bearing knock.When I confronted chevy with this problem they stated this was normal for the 5.3 liter v8.Being a mechanic myself didnt think this sounded right.My friend has a 2003 gmc yukon and motor sounded same way.I no longer own my chevy,But my friend still has yukon with 150,000 plus miles and yet it still knocks when you start it.this is just a problem with chevys and other gm products.
Could be the oil pump but it could be the crank bearings are so worn that you have no oil resistance causing intermittent low oil pressure.
The pan on the bottom of the engine needs to be removed to access the oil pump and that could be a job but it sound like you might have some serious engine damage. This vehicle needs to be diagnosed by a qualified technician to ascertain the viability of the engine.