Trying to fix a few stripped tranny pan bolt holes...help!

[d0n_3d]

Does anyone happen to know what heli coil size I need to get for about 3 tranny bolt holes? 3 of the holes are stripped out and I had them tapped for a bigger thread and it still doesn't work. Pan still leaks. Unless someone else has a better idea? I just don't want this pan leaking anymore. I have always let it go because it would only drip a couple drops or so but I want it leak free. And don't ask how I stripped the holes. It happened 5 years ago!

 

[MeanBuicks]

Those threads are M8 x 1.25.

 

[d0n_3d]

awesome thanks for the quick response!

 

[INEEDAGN]

If it's still a stock or even an aftermarket sheet metal pan, hold it eye level looking down the pan rail and make sure it isn't dimpled upward at the bolt holes (from overtorqueing). This is a very common cause of pan gasket leaks, and it's the reason everyone goobers them up with liquid snot (silicone). If it is dimpled, stick a small ball peen hammer on the hole(s) with the pan rail on the edge of a bench, and smack the ball peen hammer SMARTLY with a soft face hammer. It's ok if it dimples downward, as the bolt will stretch it back up level when torqued. Use a cork/neoprene gasket and torque to 8 ft. lbs. after you fix the stripped holes. You should be done messing with it at that point in time.

Hope this helps.

bob

 

[d0n_3d]

Yeah I didn't think about that. Not to mention over the years I have never had a drain plug in my pan and I've always had to drain the fluid by taking the pan off all the time. I'm sure letting that thing hang by one or two bolts trying to drain the fluid doesn't help the straightness of the pan either. Where can I get a stock pan with a drain plug at??? I checked the auto parts stores and they don't have them. How much am I looking at?

 

[Firechicken]

For my pan, I went to the auto parts store and got a volkswagen drainplug. I then found a nut it would screw into. I drilled a hole in my pan and welded the nut to the outside. If I put it on the inside the nut would block about a 1/2" of fluid from draining.

 

[INEEDAGN]

Or, you could go down to the hardware store and get a 1/4" NPT coupler and 1/4 NPT plug to go in it. Weld the coupler in the pan and screw the plug in to seal it. You would probably want to cut the coupler shorter, and install it facing rearward so it won't catch anything on the road.

 

[cutlasskid]

not sure what gasket your using but get the better one not the cork after the fixing of bolt holes and pan strighting.