C4 Issues

[67coupe351w]

Hey guys, I rebuilt my C4 a few months back and am finally getting around to being able to test it out. The instructons that I followed said to put the paper gaskets in dry. I did this but I've got a problem.

The pan, the tailhousing, and front servo gaskets all have slow seepage through their gaskets. I tried tightening the bolts down a little more to a point I thought was safe but they all still seep.

Is there something that is safe to use that I could put on these gaskets?

Thanks

 

[GaPonyFarm]

I hate pan gaskets and always use Black RTV to seal them... You can probably get a new seal kit that would include the rear extension and servo gaskets, for only a few bucks or the needed gaskets individually from a transmission parts store.

You were told the correct thing about installing dry. Sounds like you torqued them down too much. Next time, don't install those gaskets until you're ready to put the tranny to use, they need to heat up and have tranny fluid seal up the internal edges.

 

[67coupe351w]

I might add they leaked really bad before I tightened them further.

Is it possible to change the intermediate servo gasket without droping the whole valvebody? I would assume that when you pull out the server there isnt a very good way to tell if you got it put back onto the band correctly.

Would it be a bad thing to put a little black rtv on the other gaskets or would I have some serious problems?

Also, the tranny never has fully heated up, is there a possibility that the leaking servo and tailshaft would seal up after it heated up?

thanks.

 

[67coupe351w]

echo?

 

[GaPonyFarm]

You want to try VERY hard to hold the servo piston in place while you get the new gasket in place... if you here a clunk, you'll have to pull the valvebody out to replace the end of the band adjuster. But the valvebody R&R is pretty simple, as you know. Just be sure to replace the pan last..just in case.

I wouldn't use anything on the paper gaskets, but you could use some aviation grade gasket sealer, if you wanted.

I doubt that getting the tranny hot at this point would help seal up the leaks, since you've torqued them down twice... its good that the gasket kits are cheap.

Good luck with the leaks...C4s love to leave a bit of their "blood" everywhere they go.