my jeep grand cherokee will startoff with good oil pressure but then when i start driving the oil pressure drops to zero. i just had my oil changed twice and the oil comes out black . and i had both oil changes done in the same week. a 5 day span between. the first time i had it changed the place that changed it did a sludge removal. what i think is happening is some sludge was forced down to the oil pan and its clogging the oil pump. i was also wondering the difficulty of droping the oil pan and changing the oil pump
2006-10-20 06:00:08 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Sounds possible but also those sludge additives can severely damage an engine if used incorrectly. They are designed to remove sludge so it has to be some kind of treatment that dissolves oil. Now, you also have to run the engine while doing so and that's where the problem comes in. It is also dissolving the oil and its lubricating characteristics while you have a running engine. Now it scores the bearings and that is where oil pressure basically comes from. All the pump does is circulate the oil. I would definitely drop the pan and see what the oil pump screen looks like but while you're in there I would also check a few main and a few connecting rod bearings to see what the treatment did to them. You can get platigauge at most auto parts store. Put a piece in the bearing and re torque to specifications and then remove. Check the plastigauge against the chart to see if you are within specs or not. Also, check the bearings for scoring too!
2006-10-20 06:12:12 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Have the oil pressure tested with a gauge other than the one on your dash. Could just be a bad sender. As for the sludge in the pan that is possible if they didn't run some extra oil through with the drain plug out to rinse the pan out. Depending on what engine you have and if it's 4wd it is not hard to change the oil pump but it is a dirty job and takes awhile.
2006-10-20 06:13:58 · answer #2 · answered by iwingameover 5 · 0⤊ 0⤋
There's prob. nothing wrong with the pump---YET.Your screen is likely plugged up with sludge from the sludge job you had done.Here is the shadetree fix(not recomended) .Pull the filter off.Drain the oil.Blow compressed air into the threaded nipple that the filter screws onto,that will force air thru the oil pump and out thru the pickup screen.NOW you have another problem-the sludge is now in the oil pan.Pour a qt. of oil down the engine and hope the clump of crap comes out the drain hole.------OR -YOU CAN FIX IT RIGHT.DROP THE PAN & CLEAN IT OUT.
2006-10-20 07:30:37 · answer #3 · answered by dutch 2 · 0⤊ 0⤋
Sludge removal is not something any good shop would do. It almost invariably trashes the engine by killing seals and forcing sludge into hundreds of places it shouldn't be.. There's not too much you can do when you go 20,000 miles between oil changes too often.
2006-10-20 12:30:14 · answer #4 · answered by Nomadd 7 · 0⤊ 0⤋
It is probally that the clearence between the piston and the engine block sleeve has increased and also the bearings must be worn out. Try a high viscous oil however this will be temperoray. Basically what has happened is that rubbing parts have developed hihger clearens and the oil leaks from these points
2006-10-20 06:06:25 · answer #5 · answered by Lalindra K 1 · 0⤊ 1⤋
Did u make sure that the filter was changed as well. If u don't change you're filter when you change your oil it will be dirty. One thing that i do with my car is put in a 5w30 oil and it cleans all the junk out of my car and I run that oil for about a month then put back in a 10w30 it seems to keep my oil cleaner longer.
2006-10-20 06:07:15 · answer #6 · answered by Anonymous · 0⤊ 1⤋