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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 12-07-2012, 08:34 PM   #1 (permalink)
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primary gasket help??

over the last year, i have put two different primary gaskets on my 66' TR6.....both have leaked fluid (bottom side where cover meets engine, after a ride i used mirror on floor to see where it comes from) so my gasket is not sealing properly.

both times i have used brand new gasket, no gasket sealer, and tightened bolts slowly as i went around the cover to get even torque on each one.

is there some kind of trick to get it to seal, should i try two gaskets to help fill possible un-even surface, should i use some kind of RTV? anyone else have this problem? it's the only leak on my bike and it drives me crazy, plus makes a nice mess each time i park the bike.....thanks,, Rick
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Old 12-07-2012, 09:34 PM   #2 (permalink)
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Last edited by DaveDone; 12-07-2012 at 09:38 PM. Reason: double post
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Old 12-07-2012, 09:37 PM   #3 (permalink)
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Have you looked to see that there are no scratches or gouges on the mating surfaces?
if you are careful you can use a long flat board with abrasive paper on each end to insure you're not rounding the edges. worked for me as I needed to dress up my cover but did not want to pull the guide pin and I have no glass that large !
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Old 12-07-2012, 09:37 PM   #4 (permalink)
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razman

First off- make sure it's primary and not gearbox oil.

G/B oil has a pungent odor and will leak down behind the primary cover.

Try and find a surface plate or piece of glass to check for flatness of the cover and file out the high spots.

Just had the same problem with mine and am using 1207b Suzuki form in place gasket sealer.

Had to remove the alignment dowells in 2 places to help it break the case free in the future (hopefully).

Even made my own gasket last time but they never seem to survive being removed without damage so am trying what I had in lieu of.

My neighbor has a cast iron surface plate so we used that to find two major high spots due to over-torqueing.



Mine is still a problem with the chain adjuster access screw and o-ring, but this is behind the cover itself.

As yours is a bit older, not sure how the drain plug would affect leaks.

Someone on another forum found a piece of polished granite scrap big enough to use as a surface plate- broken scrap from a stone shop or big-box home center.
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Last edited by Morris the Cat; 12-07-2012 at 09:56 PM. Reason: add info & hope to help
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Old 12-08-2012, 12:58 AM   #5 (permalink)
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yes, it is primary fluid, as i use ATF type F in the primary, and it is dark red in color and is easy to spot......should i try a thin layer of "form-a-gasket" on both sides of gasket (or RTV)??? i know that i will destroy the gasket if/when i remove primary cover again, but hopefully that will be way down the road. btw, i took this primary cover to engine rebuilder and he put it on his big belt machine that he uses to deck heads for cars.....he gently ran it on there and it is flat, no issues, although engine mating surface could be the prob, so i will take a look at that when i pull the cover this time.....what about using the gasket sealer? thanks, Rick
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Old 12-08-2012, 05:44 AM   #6 (permalink)
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Try a smear of grease on both sides of the gasket.
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