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Restoration & Repair Tips Board

Gookumpucky (gasket cement)

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Greasy John

03-18-2004 19:59:27




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Hi everybody, well looks like spring has come to the Blue Mts of oregon. I finally got warm enough to run the 350 outside and break it into .Thought I had made a mistake when I rebuilt the engine in Nov. Turned out the leaking was not the crank seal but the gasket that runs vertical between the seal cage and the block. Now--- I used that spray copper gasket cement and it failed to hold on the aluminum side even tho I washed it with acetone-then let it dry. This time I used Napa Ultra black Silicon and to me its much superior. Absolutly no leaks. I am sold !!!!! FWIW John

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mj

04-07-2004 09:19:50




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 Re: Gookumpucky (gasket cement) in reply to Greasy John, 03-18-2004 19:59:27  
The Japanese motorcycle brands use a no-gasket metal-to-metal sealer (Yama-bond is Yamahas' name for it) on cam covers, etc. Works great! As far as silicone goes, I gave up on it after numerous failures and went back to #2 Permatex for gasket sealing.



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CNKS

03-19-2004 12:53:26




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 Re: Gookumpucky (gasket cement) in reply to Greasy John, 03-18-2004 19:59:27  
I too, thought I messed up when I installed the rear seal -- turns out I didn't replace the two plugs at each corner of the block that the horizontal retainer plate fits into. I replced the retainer plate seal and plugs and stopped 90% of the leak. Although I also used copper spray on the vertical gasket, I don't think it or the rear seal leaks because I can't feel any oil at the bottom of the crankshaft seal retainer (can't actually see up in there). My oil pan was almost impossible to seal. Ended up using no gasket and some of NAPA's high dollar ($15) Permatex sealer. Still leaks a little -- what did you use to seal the oil pan? I believe mine leaks mostly at the places on the ends where the castings meet. All sorts of opinions which sealer to use for what, I still don't know.

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Bob

03-19-2004 09:51:59




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 Re: Gookumpucky (gasket cement) in reply to Greasy John, 03-18-2004 19:59:27  
The surface of the seal holder is probably not completely flat, and there was a gap that the copper spray could not bridge. The silicon filled the void an stopped the leak.



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greasy John

03-19-2004 12:41:54




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 Re: Re: Gookumpucky (gasket cement) in reply to Bob, 03-19-2004 09:51:59  
George--I did use permatexcopper.--I did coat both sides and surfaces. I did let it dry before putting them together. IT still failed .You may be right about KW ,Iknow they make good products but so does Permatex. See Bob's remarks ?? I noticed some slight distortion around the bolt holes in the aluminum so I ran it across some 400 paper . But like Bob says there is the likely
chance it still was flat. Any way I note that Chrysler and GMC use the plumbers stuff on tranny's and differentials without gaskets so it must keep the stuff?? in Tnx guys for the space.

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george md

03-18-2004 23:55:32




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 Re: Gookumpucky (gasket cement) in reply to Greasy John, 03-18-2004 19:59:27  
John, 10 to 1 you used permatex copper and did not let it dry before putting gasket on. K&W copper is many times better than permatex brand. Apply copper to both the gasket and the mating surface LET DRY for several minutes , when it is very tacky put gasket in place , do other side of gasket if so inclined . K & W is a great product. Silicon belongs in a plumbers tool box , it is tub and tile sealer .

george

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