Thread: Trans. Leak

Tweet

1.(Chevy T400) Can you use teflon tape on the connections from the rad. to the trans.?

no---tape is for taper ed threads

You may be leaking from the fitting that screws into the trans. Not the tubing fitting I would take off the tubing fitting and see if the other one is loose, leaking. May be a bad flare too???? When tightening the flare use a hold back wrench on the other fitting.

Thanks guys!

I just changed dip stick tubes from a Lokar to Hughes to cure a leak I've chased all over my tranny. First, thought it was the cooler lines, then the pan, then the gasket - and finally found the culprit. This was the 'improved' Lokar but the o rings still allowed a leak. Worse, I had put larger cross section o rings on but never tried the next size - which would probably worked. Someday maybe

I have found that on the CHROME tubes if you run the tube on a wire wheel where the O ring goes it roughs it up enough that it dosen't leak.

We just installed one of those new Lokar short transmission dipsticks on Dan's rpu and while it doesn't look like it will leak, it is a real mother when you try to pull out the dipstick. The way it works is like the quick disconnects on your shop air hose, where you pull down on the collar and it releases the chuck. But this thing is impossible to pull back, especially when installed under a car. We had to use two jewelers screwdrivers in the crack to get it to move, then we were able to pull the collar down.

I called Lokar to find out why so tough and the guy said he would bring it up to the engineers. Lokar uses this same base with their extended dipsticks, so Dan ordered the rest of the parts to move the dipstick into the engine area. That way we will never have to unclick that fitting again to check fluid.

Don

Originally Posted by Itoldyouso

We just installed one of those new Lokar short transmission dipsticks on Dan's rpu and while it doesn't look like it will leak, it is a real mother when you try to pull out the dipstick. The way it works is like the quick disconnects on your shop air hose, where you pull down on the collar and it releases the chuck. But this thing is impossible to pull back, especially when installed under a car. We had to use two jewelers screwdrivers in the crack to get it to move, then we were able to pull the collar down.

I called Lokar to find out why so tough and the guy said he would bring it up to the engineers. Lokar uses this same base with their extended dipsticks, so Dan ordered the rest of the parts to move the dipstick into the engine area. That way we will never have to unclick that fitting again to check fluid.

Don

Don - when you get the new 'stick, check the fit in the tranny (assuming it's a case fill). You might want to consider different cross section o-rings if it's at all sloppy or you will be chasing another leak

This is what I wrote earlier: http://www.clubhotrod.com/forums/showthread.php?t=47879

Post 7 gives you the different o-ring sizes available

My new Hughes has a locking 'stick that I have tucked way back against the fire wall - my "special" funnel device makes sure you don't fill too quickly

Dave. This new fangled one from Lokar doesn't use orings like the old ones. You actually have to remove the pan, insert the tube into the hole, and put a big nut on the underside of the tube and tighten it down. It uses a rubber seal that goes all the way through the trans case. I don't think it has a chance of leaking, but not being able to get the dipstick released is a real problem.

Don

Originally Posted by Itoldyouso

Dave. This new fangled one from Lokar doesn't use orings like the old ones. You actually have to remove the pan, insert the tube into the hole, and put a big nut on the underside of the tube and tighten it down. It uses a rubber seal that goes all the way through the trans case. I don't think it has a chance of leaking, but not being able to get the dipstick released is a real problem.

Don

Don - all the Lokar cat shows so far for the C4 is the O-ring type That's possibly because there isn't an actual fully machined dipstick through hole(at least mine isn't). Dang!!!

That is probably true, ours is a th350 and they put an adapter in there for the PG transmission too. When we installed the Lokar trans dipstick on Don's C4 we gooped it up real good with RTV and I don't think it has leaked anything yet.

Don

Originally Posted by Itoldyouso

When we installed the Lokar trans dipstick on Don's C4 we gooped it up real good with RTV and I don't think it has leaked anything yet.

Don

I tried that too - didn't work - just made a gooey mess So far - for 3 weeks now, still dry under the car tho I did put sealing washers under the bolt heads just to be sure