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If you are going to change the gasket, you should also change the filter at the same time, especially if it hasn't been done recently. You will need a large drain pan to catch oil in because there is no drain plug. Remove the bolts down both sides of the trans pan, 1/2" I believe, and loosen the back ones 3 or 4 turns. Loosen and slowly remove the bolts on the front of the pan because oil will start to drain from there. Once the oil has drained remove the back bolts and drop the pan. clean it out good and check for "stuff". It's normal to see silver filings in the oil but an excessive amount or actual pieces indicate a problem. Two screws should remove the filter. Replace it and put the new gasket on and set the pan in place. Bolt it on. Torque specs for these bolts are 12-13 ft.-lbs for the Turbo 350 and 400. The 700R4 is torqued to 18 ft.-lbs.
If you have trouble getting at the rear bolts on the trans pan, you may need to unbolt the trans mount and lift the tailshaft a little with a jack to get enough room to get it there. Be gentle doing it.Hope this helps.
Remove exhaust crossover pipe at manifold and converter.
Remove flywheel cover.
Disconnect transmission oil cooler lines at oil pan.
Remove engine mount 'through' bolts on V8. Loosen right bolt and remove left on V6.
Remove oil pan bolts and lower oil pan. Check that forward crankshaft
throw and/or counter balance weight are not extending downward so to
block oil pan removal. Turn crankshaft, necessary, to put throw on
No it not at that housing, Its under the car kinda. If you remove the heat sheild for the exhaust manifold you will be able to see the top of the housing. It connects to the bottom of the water pump housing then to a metal pipe that goes under the oil pan to the lower radiator hose. You will be able to remove the two 8mm headed bolts from the top, then unbolt the stud that holding the metal pipe under the oil pan and then you can get to the t-stat. Lots of work in tight spaces but it is possible to do with out pulling the exhaust manifold or the water pump housing!
Changing the oil pan gasket on a GMC Yukon XL is realtively simple, but does require removal of the exhaust pipe. You will need a new oil pan gasket and a new exhaust pipe flange gasket. Put the car on ramps or jacks to access the undercarriage. Remove the exhaust pipe by removing the 3 nuts holding the exhaust pipe flange to the exhaust manifold. These nuts often rust and prior application of penetrating oil may be required to remove them without damage. Once the pipe is unbolted, work the exhaust system loose from the hanging brackets. In most cases the entire system does not have to be removed since there is enough room to remove the pan with only the front hangers removed. Drain the oil from the engine Remove the 10 mm bolts holding the pan to the block. Remove the old gasket material and scrape any remaining gasket from the block and pan. Install the new gasket. Forma-Gasket or a similar product may be used in small quantities to "glue" the new gasket in place and prevent shifting while the pan is reattached to the block. Reinsall the 10 mm bolts in a cross pattern to ensure the gasket is compressed evenly. Do not overtighten the bolts. Replace the pipe to flange gasket between the exhaust pipe and the exhaust manifold with a new part. Reattach the exhuast pipe to the hangers. Install the 3 bolts connecting the pipe flange to the exhaust manifold. Fill the engine with oil.
You need to drop the exhaust then the pan comes down. BUT if you are doing this because the exhaust shield has rubed through the paint making the pan rot out in that one spot. then once you remove the exhaust grind the pan where the hole is and wire brush an old copper penny and use ( J B weld ) epoxy http://www.jbweld.net/index.php
to stick the penny over the hole, then with a hammer tap the exhaust shield back so it doesnt touch the pan and bolt it back up.
dropping the exhaust is tricky, once you have the 4 oxyigen sensors unpluged remove the 4 exhaust manifold nuts off the studs (you might need to use a torch to heat them up) then unbolt the flex pipe and you will have 1 more bolt in the middle of the system that as you crank it out the exhaust will come down
The car has three mounts in a triangle configuration. The front trans mount, the passenger side motor mount and the rear motor mount. I do not know if anyone has ever successfully raised the engine to slide the pan out, but remember, if you do this, the pan goes back on with anaerobic gasket maker on it, so make sure you can slide it out with grating on the underside of the block. If you can't, then it will likely be impossible to get back in place without smearing the gasket maker all over and making a heck of a mess. The commonly accepted way to remove the pan is to remove the two front subframe bolts and allow the subframe to drop enough to get the clearance you require. The bolts are 18 mm heads and are really torqued on there so you will need a serious breaker bar and cheater bar to go with it. USE SOLID JACKSTANDS or BETTER YET, RAMPS to do this. The force you will need to apply can take the car right off a single jack.
1. Disconnect the negative battery cable.
2. Drain the engine oil from the engine crankcase.
3. Remove the exhaust flex pipe retaining nuts from
the exhaust manifold.
4. Remove the exhaust flex pipe retaining nuts from
the catalytic converter or the connecting pipe.
5. Remove the exhaust flex pipe.
6. Remove the oil pan flange–to–transaxle retaining
7. Remove the oil pan retaining bolts.
8. Remove the oil pan from the engine block.
1. Clean the oil pan sealing surface.
2. Clean the engine block sealing surface.
3. Clean the oil pan retaining bolts.
4. Clean the oil pan attaching bolt holes in the engine
5. Clean the oil pan scraper.
1. Coat the new oil pan gasket with sealant.
Important : Install the oil pan within 5 minutes after applying
the liquid gasket to the oil pan.
2. Install the oil pan to the engine block.
3. Install the oil pan retaining bolts.
Tighten the oil pan retaining bolts to 10 NSm (89 lb–in).
4. Install the oil pan flange–to–transaxle retaining
Tighten the oil pan flange–to–transaxle bolts to 40
NSm (30 lb–ft).
5. Install the exhaust flex pipe.
6. Install the exhaust flex pipe retaining nuts to the
Tighten the exhaust flex pipe–to–exhaust manifold
retaining nuts to 35 NSm (26 lb–ft).
7. Install the exhaust flex pipe retaining nuts to the
catalytic converter or the connecting pipe.
Tighten the exhaust flex pipe–to–catalytic converter
or connecting pipe retaining nuts to 35 NSm (26 lb–ft).
8. Connect the negative battery cable.
9. Install the oil pan drain plug.
Tighten the oil pan drain plug to 35 NSm (26 lb–ft).
10. Refill the engine crankcase with engine oil.