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Depends. On some cars you can remove the pan with engine in the car. Drain it, remove all bolts and remove pan. If stuck, use putty knife to help free it up. Some cars and trucks , especially 4wd may require removing motor mounts and jacking engine up some. Some require pulling the engine.
Jack up truck for safety sake put jack stands under frame . remove all engine oil remove all bolts holding oil pan on if their is not enough room to drop pan you may have to remove bolts holding motor mounts and jack up engine. if front end linkage is still in the way remove linkage. pull oil pan out. check gasket that was between block and oil pan if any stuck to block of engine remove with gasket scraper or wire brush or wire wheel on drill.make sure mating surface is clean put new gasket on new oil pan I like to use a high temp sealer on gasket both sides. Put pan with gasket back in place of old oil pan and tighten all bolts. jack engine down ,replace moter mount bolts replace any linkage you took apart. and dont forget to replace engine oil. make sure oil plug is in pan before pouring oil in . before starting engine check that no oil is leaking than start engine and check for any leaks again if all is good your done. if this was helpful please leave good feed back. A good temp fix on a rusted oil pan is JB weld make sure no oil is on pan clean with towel and rubbing alchol .you may have to drain oil first. if it is rusted badly you may have to use a wire brush on a drill to clean the area to patch. if patched properly it may last for years.
goto YouTube and paste the following into the YouTube search window and look at various videos covering your issue ( 1994 cadillac eldorado with a 4.6 northstar oil pan gasket change )
YOU DON'T HAVE TO PULL THE WHOLE MOTOR! ALL YOU NEED TO DO IS REMOVE THE MOTOR MOUNT BOLTS, AND JACK THE MOTOR UP JUST HIGH ENOUGH TO CLEAR THE CROSSMEMBER, AND OIL PUMP!
jack up the van place jack under oil pan with wood block between oil pan and jack pull the 2 nuts and 3 bolts, jack up motor pull out mount and reverse steps to install
YOU MAY HAVE TO PULL THE MOTOR MOUNT BOLTS, AND RAISE THE ENGINE HIGH ENOUGH TO GET THE OIL PAN TO CLEAR THE CROSSMEMBER, BUT YOU SHOULDN'T HAVE TO PULL IT OUT! JUST HIGH ENOUGH TO CLEAR THE OIL PUMP INSIDE THE PAN!
Before you do, why do you want to change the pan? OK then, consider the sump, is it front or rear? Do you have room to drop the pan 6 inches and get it out? The oil sump is at the bottom of the pan. If not, you have to pull the motor mount bolts out and jack up the engine. Then pull it out. When you put in the new pan, use no adhesive on the gasket, none. Bolt that baby up, drop the engine, tighten everything up, fill her up with oil, you should be all set.
Remove motor mount bolts and rear transmission crossmember bolts or nuts,suppport engine/trans. see if u have enough clearance between pan and axle remove pan. if not, split the exh away from the manifolds. worth a try
You can pull the motor mounts bolts and jack the motor up alittle, that will give you enough clearance to drop your oil pan. If you try and replace the timing chain cover without dropping the oil pan, you will more than likely wind up with an oil leak.
You should be able to replace the timing cover without removing the oil pan. The gasket set should contain gaskets allowing you to cut the oil pan gasket and put in a new partial gasket in this area. In the corners make sure you use some RTV sealant. If you are careful, it can be done. Like Bob A says you can end up with a oil leak without dropping the pan (unless you clean up the area and properly apply the RTV and gasket). If you have time to drop the oil pan, then I would do that.
take loose the motor mount bolt and jack the front of the engine up to clear the oil pump and remove the pan,.the bolt the runs thru the center of the mounts ,the easiest way ,hope this helps you, thanks robert b.
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