Burnt Valve Gasket? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 10 (permalink) Old 05-04-2019, 03:58 PM Thread Starter
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Hey Guys

Today I went for a bike run to commemorate the 60 Years of the 59 Club in London, From the Ace Cafe to St Pauls Catedral. and as you know those rides can get kind of slow... and my bike heated like crazy. after I parked the bike for 2h It wouldn't start again...it took me 5 minutes to be able to start it (never happened before, normally starts first try even cold) I checked the bike and found this 'photo' looks like an oil mark coming from the valve gasket, did the heat burn off the gasket?

Give me your thoughts Guys
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post #2 of 10 (permalink) Old 05-04-2019, 07:55 PM
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Doubtful the gasket is ruined. The grommets/seals under the hold down nuts are known to collapse and lose their tension reducing the force holding the cam cover down. Best to replace them. They can be shimmed using thin gasket material between the nut and washer, but be careful and do not over tighten, some say they are easily buggered. How many miles on the bike?
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post #3 of 10 (permalink) Old 05-05-2019, 02:46 AM Thread Starter
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Just under 10,000.
I believe under the heat the motor was subjected to during the ride with the metals expanding and contracting, a bit of oil might have "perspired" trough the gasket.
I have to get rid of the the Freaking AI system

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post #4 of 10 (permalink) Old 05-05-2019, 10:29 AM
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My 08 T100 was leaking when I bought it at 13,000 miles. I didn't replace the gasket but did shim the grommets, now at 33,000 miles it's still leak free.
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post #5 of 10 (permalink) Old 05-05-2019, 11:34 AM
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Seepage around the cam cover gasket been a common issue for years on these bikes. Replace the four seals as mentioned and torque evenly and carefully to 10NM only. Do NOT overtighten.

It might be difficult to loosen the screws if you've never had them off. Use a quality bit and a breaker bar to crack them loose.

If replacing the seals doesn't fix it, you can try replacing the gasket, but it probably is not necessary.

Marty
2005 Bonneville Blue 790cc, AI removed, Staintunes RC, no snorkel, inlet enlarged, 118/40/NBZT needles/1 shim/3 turns, Ikon 7610s, Ricor Intiminators, Barnett green clutch springs, Michelin Pilot Activs, D9 gauge panel, tachometer.
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post #6 of 10 (permalink) Old 05-06-2019, 06:21 AM Thread Starter
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Thanks everyone, I have to get around to buying a torque wrench.

I have a full garage of tools in Portugal but it's not worth bringing them here so... I have to buy a lot of them again

since I will remove the bolts to replace the grommets don't you thing since I am removing them might as well do the seal as well?
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post #7 of 10 (permalink) Old 05-06-2019, 03:34 PM
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Quote:
Originally Posted by rweb View Post
My 08 T100 was leaking when I bought it at 13,000 miles. I didn't replace the gasket but did shim the grommets, now at 33,000 miles it's still leak free.
Same. Replaced the gasket and replaced the washer/grommets. Still holding up from last summer.
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post #8 of 10 (permalink) Old 05-07-2019, 10:40 AM Thread Starter
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Originally Posted by kunkledude View Post
Same. Replaced the gasket and replaced the washer/grommets. Still holding up from last summer.
So... not the same XD
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post #9 of 10 (permalink) Old 05-08-2019, 03:19 PM
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Dealer recommended I switch out the 4 grommets when I do the gasket change. Torqued accordingly and it was all good.
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post #10 of 10 (permalink) Old 05-13-2019, 11:19 AM Thread Starter
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Will do Will do Thanks
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