Need Help With A Leaking Trans Pan
Thread Starter
Burning Brakes
Joined: Feb 2002
Posts: 804
Likes: 5
From: Fresno CA
Need Help With A Leaking Trans Pan
I recently installed a Moroso aluminum transmission pan on my 700R4 and I used a Neoprene gasket and filter from Napa, I installed the gasket dry like I've done on other transmissions in the past and torqued the bolts to the spec in my FSM. After I broke my new engine in and while the car was up in the air I noticed some seepage from the front of the pan between the gasket and the pan and the gasket and the case, so I cleaned it up with brake cleaner and went back and snugged the bolts all up again but a little more snug than the first time and let the car just sit and the next day...still leaking...anyway, I took the pan off and checked it on a machinists surface plate and there was a very slight rock to it from side to side (only about .025) but I took it to a machine shop and had it surfaced just to be sure, got it back, checked it again and this time it was perfectly flat, I even compared it to my OE pan and it is straighter than that one. So I reinstalled it again, also with the gasket dry and looked at it tonight and it is still seeping...
So now what? I thought the Neoprene gaskets were better than the cork so that's what I used and I have always installed the gaskets dry but now I'm wondering I should use sealer but I don't want to smoke the transmission by using it....any ideas?
So now what? I thought the Neoprene gaskets were better than the cork so that's what I used and I have always installed the gaskets dry but now I'm wondering I should use sealer but I don't want to smoke the transmission by using it....any ideas?
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Tough luck there, eguy...
I got a few pics in this thread; don't know if it will help tho', except for the grease (not sealer)...
http://forums.corvetteforum.com/show...ny+filter+swap
I got a few pics in this thread; don't know if it will help tho', except for the grease (not sealer)...
http://forums.corvetteforum.com/show...ny+filter+swap
Intermediate
Joined: Jan 2008
Posts: 28
Likes: 0
From: Akron Ohio
If it looks wet at the front of the pan then take off yor flywheel dust cover and check the front seal and or front pump gasket & o-ring for leaks. A small leak from there will run down to the pan and fool you.
Always look at a higher point where you think it might be leaking.
cooler line fittings, down shift cable, shift linkage. ETC
Always look at a higher point where you think it might be leaking.
cooler line fittings, down shift cable, shift linkage. ETC
Thread Starter
Burning Brakes
Joined: Feb 2002
Posts: 804
Likes: 5
From: Fresno CA
If it looks wet at the front of the pan then take off yor flywheel dust cover and check the front seal and or front pump gasket & o-ring for leaks. A small leak from there will run down to the pan and fool you.
Always look at a higher point where you think it might be leaking.
cooler line fittings, down shift cable, shift linkage. ETC
Always look at a higher point where you think it might be leaking.
cooler line fittings, down shift cable, shift linkage. ETC
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Hellava lot of difference between oil and tranny fluid, you know the difference. I'll tell ya, I hate Neoprene gaskets, my problem is they always seem to move, if you insist on using them put a little sealer on the corners and around the bolt holes. Give me the old cork gaskets any day, I always did what I suggested above, especially on pan and
valve covers, I simply put enough gasket cement on to hold them in place on the pan or cover, I usually installed the bolts in the pan or valve cover for alignment purposes..let it sit for awhile and then bolted it up, can't tell ya how many times I was able to re-use the same gaskets.....learned this when I ran solid lifters. And on the damn intake, thoughs Neoprene gaskets always moved....now the guys use The Right Stuff cement, which I haven't had to try yet.
valve covers, I simply put enough gasket cement on to hold them in place on the pan or cover, I usually installed the bolts in the pan or valve cover for alignment purposes..let it sit for awhile and then bolted it up, can't tell ya how many times I was able to re-use the same gaskets.....learned this when I ran solid lifters. And on the damn intake, thoughs Neoprene gaskets always moved....now the guys use The Right Stuff cement, which I haven't had to try yet.
