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Transmission oil pan gasket

Ref: 2000 Pontiac Gran Prix with 3.8 L normally-aprirated engine and 4T65E transmission

I have twice installed new oil pan gaskets on this transmission in an unsuccessful attempt to stop minor leaking of transmission fluid around the pan-transmission interface. The second gasket was an OEM gasket purchased from Pontiac. After installing the new gasket the retaining bolts were torqued to 10 ft-lb. In neither case did I use any type of silicon/grease/sealer on either side of the gasket. Placing a straight-edge on the pan and on the transmission did not reveal any deformities or scoring.

Question: Should a bead of silicon or other sealer be spread on the gasket of this transmission when installing a new gasket? If so, what type sealer should be used?

Ray

Reply to
Ray Hardy
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The gasket should be installed clean and dry. The surface of the pan and transmission should be clean and dry as well as the bolts. When you torque the pan down the same principles apply to it as if torquing the heads or wheels. "As in" you should stagger your torquing. Afterwards you should go back to your first bolt and begin torquing again. (use smooth motion with your torque stick, dont jerk on it)

Something to consider, Bolts 1-2-3

If bolt 2 was torqued to 10 pounds, then 3 and 1 were torqued to 10 pounds, bolt 2 would then have less pressure being applied as bolts 3 and 1 have lessened the pressure of 2.

Does that make since? It will once you go back over it and find out how much play there was until it reaches the correct torque again.

I usually hit the straight sides of the pan first while working towards the corners.

Reply to
Bon·ne·vil

dang it must have been too long of a day, of course the OP was talking about the tranny gasket, I tried to cancel my message, oh well, maybe the oil pan tsb will help somebody else

Reply to
Markeau

I don't use the gaskets anymore. I think the goop by itself is much better. Let it sit and dry 30 minutes before you put the pan on. Then wait as long as you can stand it before you put the oil in. (like overnight, or 24 hours, or even more). Overnight is the minimum.

Reply to
Joe

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