Question about 1993 Jeep Grand Cherokee

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I want to remove the oil pan without pulling the engine. Main and Rod bearing replacement.

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NOT ON A 4X4 YOU WILL HAVE TO TAKE OFF MOTOR MOUNTS AND LIFT ENGINE 5 OR 6 INCHES AND YOU;LL NEVER GET THE CLAERANCE CORRECT ON CAPS FROM UNDER NEITH ITS A WASTE OF TIME DROP NEW ENGINE IN

Posted on Oct 15, 2010

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Can you replace main bearings without removing engine citroen c4 grand picasso 1.6 diesel 2007


You cannot replace the main bearings without removing the engine. only the rod bearings are replaceable if the oil pan will clear chassis for access to crank shaft. Why do you need main bearings on a 2007, these bearings should be good for 500,000 miles. what happened? (run without oil?)

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What are the steps in replacing the rear seal in a 1966 ford f-100 with a 352 engine?


I wouldn't be surprised if you didn't have to remove the engine/transmission, split the trans from the engine, remove the TC or clutch/pressure plate, (you should have drained engine oil and auto trans oil before doing this), remove the oil pan, remove the rear most main bearing cap, rotate a new seal into place, replace rear main bearing cap, torque, etc. and reassemble.

Worst case you may have to remove harmonic balancer and front timing chain cover, front seal, release all the connecting rod caps and main bearing caps, remove the crankshaft, replace the rear main seal and reassemble. It's a 1966 engine...you should consider replacing the front timing chain with a roller chain as well as rod and main bearing inserts if you have to do all this.

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1999 ford 5.4 triton motor,can you repair a rod knocking without pulling engine


drop the oil pan & replace all the ( connecting rod bearings ) which wear out way more than main bearings. also replace the main bearings if bad. if the bearings are still good use them because of the timming chain is heck to get back to top dead center. hope this helps you out

Jun 22, 2016 | Ford Cars & Trucks

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2002 Wrangler Sport. 4.0 My oil pressure gauge hit rock bottom, the engine made soon clanking sounds and died. I pulled the valve cover but dont see any bent rods. What else should I be looking for...


The main bearings and connecting rod bearings. The cam bearings. The wrist pins. These are the first bearings that get oil from the oil pump. When you take the oil pan off to replace the pump pull one of the rod caps and check for scaring and color change.

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I have a 2002 ram 1500 with 4.7 magnum truck


There are several reasons why you would hear a loud knock from the engine, and the knock will usually be either in the top end or in the lower or bottom end of the engine.

The first thing that should be done is to drain the engine oil, and then pour the oil filter into a pan where you can see it, and if there is a lot of metal flakes, or a fine cloud of brass floating in the engine oil, you will not want to waste the time or the money trying to repair that engine by dropping the oil pan and replacing the piston rod bearings, it will only be a very temporary patch at best, that is if the patch even lasts for a day.

If you do find metal flakes in the engine oil and oil filter, the piston rod bearings will not be the only bearings in the engine that will need to be replaced, and the crankshaft main bearings can only be replaced by removing the engine and placing it upside-down on a good engine stand. The biggest problem would be that even if you did successfully replace the piston rod and crankshaft main bearings, it would only take one piece of metal flake that was left over in the engine block to find its way to one of your new bearings and then it will take no time at all before that engine will be right back where you started, and that is how important just the cleaning process is in repairing or replacing internal engine components.

If you do not find any metal in the engine oil or oil filter, then you should attempt to find the actual cause of the knock before you decide how to repair the engine, and you will have to remove the engine oil pan to inspect the rod bearings, and if you do remove the engine oil pan make sure that when you inspect the rod bearings that you only do so one at a time because you can not mix up the rod caps, and be very sure that when you remove a rod cap that you do replace it the same way that it came off, and if you turn around the rod cap and install it the wrong way or scratch the crankshaft bearing surface the rod bearing will fail.

If you can hear the knocking louder from under the vehicle then the most likely causes for a lower end engine knock are a damaged piston, worn out piston rod bearings, a broken piston rod, a broken flex-plate, and sometimes loose torque converter to flex-plate bolts, and the only parts that you can really check out without opening up the engine would be a broken flex-plate, or for any loose torque converter to flex-plate bolts.

If you can hear the knocking more from the top of the engine, then the most likely causes for an upper engine knock would be a faulty lifter, or broken rocker arm, or a broken valve spring allowing the valve to contact the piston, and it will require the removal of the valve covers and possibly the intake manifold to inspect for the problem.

If you have any doubts then it would be a good idea to consider a good used engine that you can hear run before you buy it, or a rebuilt engine for that vehicle.

I hope that this information will help you out and save you some time and a lot of money.

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1989 jeep cherokee makes loud knocking noise in straight line six 4.0 engine. Engine does not smoke and does not appear to have a miss.


Four things can give you a knocking noise. 1. failed rod bearing 2.failed main bearing 3. Bad piston wristpin 4. broken flex plate (auto trans)
If It's a bearing, likely you are seeing lower than normal oil pressure. Any bearing repair requires the pan to be dropped but to do the job correctly requires engine removal, crank re-grinding or replacement and oiling system cleanout (expensive). Wristpin (piston/rod assembly) can be serviced without engine removal but pan and cylinder head need to be removed. Flex plate is pretty much a trans remove and replace, with new wheel.
Only a good experienced tech can differentiate between the noises so I suggest you seek aid in your diagnosis, though, if either bearing or piston is the problem I'd likely find another engine before considering the repair.

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1 Answer

How can i replace the mian bearings and rod bearings without taking out the whole engin?


if you pull the oil pan off and take the crankshaft off you will have access to both the rod bearings and main bearings. get yourself some plasta gauge for reassembly to make sure your clearances are correct. if you need any other help shoot me a message or email and ill be glad to help

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Low oil pressure on 96 toyota 2200cc engine


The oil pump can be changed without pulling the engine.

The impressive looking thing is the balance shaft assembly. These counter-rotating shafts balance out the inherent vibration of the engine. You can remove it, as long as you do not disrupt the gear placements relationship to each other. The balance assembly is set to a specific point.

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You will have to have the crankshaft machined if the rod bearing is the cause of the noise, so you will have to pull the engine, if u don't do the crank the bearing will fail in a few miles.

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