C-6 leak
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Logistics Pro
Joined: May 2004
Posts: 4,998
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From: Maryville
C-6 leak
Ok, we replaced the front seal after the engine build, since it was leaking, was in terrible shape, but the truck leaks now when it's shut down. You can run it all day long, won't see a drop from it, but after setting while shut down, the drips start. Since it was rolling off the side onto the passenger header, I was thinking it was the dipstic, so the O-ring was replaced on it this weekend, but I believe it's leaking again. It was 2 1/2 qts low and had stopped when we decided to do something, fluid was below the dipstick hole. Now I don't think it's the pan gasket, but possible since there was a block and jack under the pan, holding the transmission up while the engine was out. I may need to get it degreased to locate the problem, but I rule out the dipstick and front seal, it doesn't leak a drop running, we even had it on the interstate and run it up to 75+ mph, pulled good and was dry and full of fluid.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
I am having the exact same problem, only leaks when it's sitting, not when it's warm. I just caught it yesterday, it's the pan gasket on my truck anyhow, up by the front right corner of the pan. It's a pretty steady drip too. when it is warm though, it doesn't look like it is coming from the pan, it's still pretty clean, what sucks is I just had the gasket changed about a month ago.
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Logistics Pro
Joined: May 2004
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From: Maryville
I don't feel like fooling with the pan gasket, I want to sell it, but I'm not selling junk, this is a good truck and I don't need someone trying to get the price down over it. Wife didn't notice the leak the other day, she thinks we stopped it with the o-ring, I still say pan, shame to since the fluid lost changing it.
I always silicone both sides of the gasket, gluing the pan to the tranny.
I always silicone both sides of the gasket, gluing the pan to the tranny.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Mistake #1. Silicone.
Mistake #2. Glue.
Never ever use sealant on transmission gaskets.
Quite often the pan rail has become distorted from excess tightening of the bolts.
Straighten the pan rail and use a good pan gasket. Not those elcheepo things from some off shore company.
Mistake #2. Glue.
Never ever use sealant on transmission gaskets.
Quite often the pan rail has become distorted from excess tightening of the bolts.
Straighten the pan rail and use a good pan gasket. Not those elcheepo things from some off shore company.
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Logistics Pro
Joined: May 2004
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From: Maryville
Silicone is fine, as long as it's spread thin and allowed to dry up a bit before install, you want it even so it doesn't get inside the pan. Dealerships use it, they teach you it's uses at NADC, as well as many other reputable schools.
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Logistics Pro
Joined: May 2004
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From: Maryville
I opened one up with it on it, haven't dropped it on my big van yet, but wouldn't be supprised to see it. I use it to glue the gasket on to keep it from moving.
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Posting Guru
Joined: May 2003
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Originally Posted by maples01
Silicone is fine, as long as it's spread thin and allowed to dry up a bit before install, you want it even so it doesn't get inside the pan. Dealerships use it, they teach you it's uses at NADC, as well as many other reputable schools.
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Logistics Pro
Joined: May 2004
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Likes: 131
From: Maryville
I've used it to seal up the beatup pans in my older vehicles and have never had a problem, I don't plan on messing with this one, I think it has quit leaking. If money wasn't an issue, I'd replace the pan with a nice finned aluminum one with a drain.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
Originally Posted by rclarke
The dealership I worked in for 26 years would have fired any tech immediately if they used silicone on any part of an automatic transmission and anyone who glued a gasket to any part of an automatic transmission would be reprimanded. A straight flange on a transmission pan and a little vasoline to stick the gasket on while installing the pan then using a torque wrench to tighten the bolts will stop any pan leak.
A 100 % agreement here dude.
Silicone is a poor techs answer.
New sensors really like the stuff too. Makes them go all squirley.