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Applying silicone gasket maker

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Don - IL

07-12-2003 05:45:36




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Replacing the timing chain cover gasket on an ’89 Taurus. The front part of the rubber oil pan gasket is torn and I will remove this and make a new section. Was told that ‘the Right Stuff’ silicone gasket maker by Permatex is the best product around and this product will join to and adhere to the good section of the existing gasket.

When making the new section of gasket, does anyone know the best way to apply the silicone to make sure none seeps inside and drops into the oil pan?

I was told if this happens it could get into the bearings and destroy the engine.

Also, using Permatex ‘High Tack’ gasket sealant to seal the timing cover and water pump gaskets. Do you have the same possible problem here? They only say to ‘apply a thin even coat’ with no additional info.

Thanks, Don

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Bill C.

07-15-2003 19:02:22




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 Re: Applying silicone gasket maker in reply to Don - IL, 07-12-2003 05:45:36  
Good info in these replys. One thing left out: Don't use your finger to spread it out! The oils in your skin will collect on the surface of the silicone and prevent adhesion to the parts. Save those Popsicle sticks!



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Gene Davis

07-12-2003 19:37:56




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 Re: Applying silicone gasket maker in reply to Don - IL, 07-12-2003 05:45:36  
Many people do not realize that a large dose of silicone is not always a good thing, too many times they really slather it on. All the sealing is done by a minute thin film that is retained in between the part halves when tightened up. An excess of uncured silicone can sometimes make a gasket squirt out of place. Have seen some problems in hydrualic systems caused by silicone chunks in the control valve, also some cases where teflon thread sealing tape pieces were in the control valves causing sticking and erratic operation, plus leakdown of cylinders. Moral of this story is; it can be a friend if used correctly and an enemy if misused!

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George

07-12-2003 16:31:40




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 Re: Applying silicone gasket maker in reply to Don - IL, 07-12-2003 05:45:36  
I am not a fan of silicone gaskets. I have reworked several old tractors and cars where people had tried this shortcut only to have a leaking mess. Even the crudest handcut gaskets works better than silicone.

One thing I do know is that you have to have faying surfaces which are totally free of oil. This is very hard to do with a partially assembled unit. (Manufacturers like silicone gaskets because their piece parts are easily degreased.)

As for gasket cements, use either Permatex #2 (toothpaste consistency) or Permatex #3 (brushable).

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Bob

07-12-2003 07:37:47




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 Re: Applying silicone gasket maker in reply to Don - IL, 07-12-2003 05:45:36  
As the booze ads say "USE IN MODERATION". A SMALL amount of silicone on the inside of the gasket area won't hurt your bearings. It is not a chemical thing. What causes the damage is a LARGE amount that will plug an internal oil passage, or the oil pump screen, and starve the bearing(s) for oil.

We had a SBC in the shop that the owner had worked on that had so much silcone under the valve covers, and he must have started it right up, that it had "collars" of silicone wrapped around most of the pushrods.

Another example was a manual FWD transaxle from a small car that had a ball bearing fail.
This tranny's bearings were lubed by the oil that was flung up by the gears landing in a trough. The oil was then channeled to one end of the shafts. The shafts were hollow, and for the bearings at the other end to get oil, oil had to flow through the hollow shafts. The hollow shafts were PLUGGED with a large amount of red silcone gasket maker, and the top, far-end bearing ran dry. The source of the silcone was the tranny was worked over when almost new, under warrantee, by the dealer. They used way too much silicone, and as chunks broke off over time, they were chewed up by the gears, and gradually deposited in the oil passages.

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