Changing rear diff in ford truck. Bought a gasket from advance and guy at counter says to use silicone with gasket on both sides of gasket. Is this really necessary. Why even buy a gasket if you gotta use gasket maker. Guy seems really knowledgeable but idk. What you guys think? Use both, just gasket,or just silicone?
Gasket maker
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I think its just there to help you hold it in place lining the bolts up. Thats all i use it for.
I've used just the gasket maker (RTV) for differential cover; 2 vehicles, 5-6 years ago, no leaks. I've also used just the gasket by itself a year ago for one vehicle, no leaks.
I've also used a gasket with a super thin layer of RTV on both sides when I replaced a water pump, no leaks.
So... meh. I don't think it matters much as long as you install it correctly and torque it evenly.
I've also used a gasket with a super thin layer of RTV on both sides when I replaced a water pump, no leaks.
So... meh. I don't think it matters much as long as you install it correctly and torque it evenly.
My Ford doesn't use gaskets on the diff covers. I just used The Right Stuff on them. 
A gasket is superior to silicone, clean both surfaces well and put a thin coat of Permatex High Tack on both surfaces, it will never leak and be easy to remove next time.
http://shop.advanceautoparts.com/p/permatex-high-tack-gasket-sealant-4-oz-80062/89016795-P
http://shop.advanceautoparts.com/p/permatex-high-tack-gasket-sealant-4-oz-80062/89016795-P
Originally Posted By: Trav
A gasket is superior to silicone, clean both surfaces well and put a thin coat of Permatex High Tack on both surfaces, it will never leak and be easy to remove next time.
http://shop.advanceautoparts.com/p/permatex-high-tack-gasket-sealant-4-oz-80062/89016795-P
There's one made of copper or something for headgasket( I think), can that be used? What about grease? Since I always have grease laying around.
A gasket is superior to silicone, clean both surfaces well and put a thin coat of Permatex High Tack on both surfaces, it will never leak and be easy to remove next time.
http://shop.advanceautoparts.com/p/permatex-high-tack-gasket-sealant-4-oz-80062/89016795-P
There's one made of copper or something for headgasket( I think), can that be used? What about grease? Since I always have grease laying around.
Believe it or not, I have the same High tack, that's what I used when we did the HG on the Civic. Thanks for the info
Never use silicone RTV with a gasket. Use a gasket dressing with the gasket if need be.
Originally Posted By: Merkava_4
Never use silicone RTV with a gasket. Use a gasket dressing with the gasket if need be.
Even when the factory procedure calls for RTV?
Never use silicone RTV with a gasket. Use a gasket dressing with the gasket if need be.
Even when the factory procedure calls for RTV?
I've used a gasket. I've used silicone products like gasket maker.I never use both together. I use one or the other.
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Thanks for quick responses Im just gonna use the gasket.
I agree, silicone on both sides of the gasket. Not a lot, just enough to cover the gasket and make it stick to the cover. A gasket by itself is much more likely to leak if the bolts are over tightened or the gasket shrinks over time.
Originally Posted By: heynow
Why? I've used silicone RTV on a gasket at least a couple hundred times with zero issues.
I'll tell you why ... because the silicone RTV will not bond to the gasket. You'll have a leak at the partition between the silicone and the gasket. RTV bonds to metal only.
Why? I've used silicone RTV on a gasket at least a couple hundred times with zero issues.
I'll tell you why ... because the silicone RTV will not bond to the gasket. You'll have a leak at the partition between the silicone and the gasket. RTV bonds to metal only.
Permatex Aviation Form a Gasket.
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