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Use a putty knife to scrape old gasket from the engine block and the pan. Put a punch that is larger in diameter that the bolt holes of the pan in a vise and use a hammer to flatten the pan around the bolt holes before installing the new gasket so it won't squeeze the new gasket when you tighten the pan bolts.
Remove all bolts in the pan assembly. You may need to remove other objects that may obstruct the removal of the oil pan bolts. It would be a good idea to have the oil drained prior to pan removal. The oil pan uses a special RTV sealant instead of a gasket and can be a pain to seperate from the engine block. Use a soft faced hammer and strike the sides of the oil pan until it begins to loosen from the block. You can then use a screwdriver/prybar to seperate the seal and have the pan come off
07-06-01-016B This bulletin cover the use of wrong oil filters on the engine. The use of GM oil filters is recommended on your truck.
What happens is the oil will go into the oil pan over night causing the engine knock in the morning. The GM oil filter has a check valve in it to hold the oil in the upper half of the engine.
If you can see and get to all of the bolts which hold the oil pan to the bottom of the engine and if it appears obvious that the oil pan can be removed without being blocked by anything else, then you don't have to remove the engine. Come to think of it, I don't think that I have ever seen a car where you had to remove the engine in order to remove the oil pan.
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