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What's the best way to prevent leaking gaskets?

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D.Z.

08-24-2003 20:08:05




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Last year I rebuilt my engine on my MM with a engine gasket kit. I used permatex on the gaskets, cleaned the gasket surfaces thoroughly, wiped the surface clean with paint thinner, and now almost all are seeping oil. I also have used rubber silicone gasket material, and half the time I am pleased with that, but not all.

What are the best methods you all have for a gasket that will never leak??? Thanks for your help.

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TimV

08-28-2003 20:00:32




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
DZ: The first question to ask is where are your gaskets leaking? Specifically, many lower-grade gasket materials (such as you'll find in a typical make-your-own gasket set, or a cheap gasket kit) will leak through weepage. In other words, oil will seep through the gasket material itself, and you will see it on the outside of the gasket. In these cases, no amount of surface prep or care in installation will help. However, if you are using decent material, careful surface prep (cleaning and drying the surface to be sealed) followed by correct installation (not over-torquing and following the correct tightening sequence, plus retorquing if necessary after 24 hours) will go a long way toward ensuring a leak-free seal. One other note--use sealer SPARINGLY and evenly (if at all). Excessive use of sealer can interfere with the correct bolt load distribution to the sealing flanges, which will cause leaks.

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JOHN

08-28-2003 02:10:58




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
on sheet metal parts you should allways take a small hammer and lightly tap at each bolt hole. this bends the metal back into shape from the previous over tighting or re torqueing. how are you cleaning the surface. try not to scare with a putty knife and scare. if with a wire wheel are you sure you got all of the old gasket off. when useing a wire wheel it will polish and i have seen people leave gasket material on since it looks like bare metal. now apply silicone and let skim over before installing.and most of all do not--DO NOT over tighten sheet metal parts.

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David Bacon

08-27-2003 20:40:45




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
I best not brag, but so far I have had very good luck with silicone----- ----- -BUT If I expect to have troubles I shim the part 1/4 inch or more.( a nail just a little under all 4 corners) Then let it get totaly dry before I remove the shims and torque it down, thus you are actualy compressing a home made gasket. Dave NE Iowa



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TO-35Man

08-27-2003 17:51:11




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
Most leaky gaskets are due to over tightening and or distorted surfaces.... composite gaskets if properly installed on a clean, dry, straight surface should never leak if proper torque is used, cork gaskets on the other hand will spread and distort with or with out sealer the trick here again is clean dry, and straight surfaces and do not over tighten...it does not hurt to use a product like copper coat or high tac to hold the gasket in place . Rubber gaskets have built in compression qualities to help seal when slightly compressed..
RTV silcone(rubber) sealant should be allowed to skin over before tightening and the best RTV to use is high temp silcone sealant. permatex is another good sealant. Some hard to stop leaks are just plain poor quality gaskets and sealer is a must...one last consideration is how you clean the surface if you sand,grind etc. you stand to scratch or create a low spot that can cause a leak....
hope this helps
regards...

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Sean W

08-27-2003 15:43:58




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
Did you tighten the bolts too tight? I think thats what my problem was on my Farmall H. Plus I put them on dry, and didn't retorque. But whats wierd is that some gaskets I put on dry and it was fine, but most are leaking. Its a winter job I have to do, if I can afford to redo the gaskets. Doesn't leak alot of oil, just makes it look bad, but its a work tractor too.



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George

08-25-2003 14:14:41




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
Have you tried re-torqueing the bolts? Also if you over torque sheet metal covers and pans you can distort the mating surfaces causing leaks.

Are your surfaces flat? I had a cast flange that I could not get to seal properly to a cast housing. Finally I found out that the flange was warped such that there was a 0.030 gap on the surface between the two mounting bolts. Milled it flat and now have no problem.

Like Jailkeeper, I do not use silicone products. New gaskets with Permatex 1, 2 or 3 seems to work best.

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Jailkeeper

08-24-2003 20:18:36




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 Re: What's the best way to prevent leaking gaskets in reply to D.Z., 08-24-2003 20:08:05  
I use permatex high tack sealer on my gaskets. It's more of a liquid sealer that sets up tacky and hardens after a few hours.

I gave up on RTV type sealants years ago.



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Jerry

09-08-2003 15:50:32




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 Re: Re: What's the best way to prevent leaking gas in reply to Jailkeeper, 08-24-2003 20:18:36  
The oil is probably coming up the outside of the bolts. I always add cement to the threads where they go into the block. Molines have bolts that go thru the jugs and heads into a block that have threaded holes into the crankcase.



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