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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 05-06-2011, 03:07 PM   #1 (permalink)
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New Spec Triumph Bonneville Cam Cover Gasket

So I had my 2010 Bonnie go through a warranty fix for a weeping cam cover gasket. The new gasket the dealer installed looked slightly different than the original one that was on my bike. The new gasket (#T1260904) has a lip that cups around the outside of the cylinder head and appears to be made of a softer material than the previous gasket. Since I didn't do the install, I couldn't see if there is any difference on the inside of the gasket. Hope this new gasket would improve the oil sealing properties of the Bonnie cam cover.
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Old 05-06-2011, 03:15 PM   #2 (permalink)
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Thanks for that. It now looks as if both components responsible for the tiresome leaks reported from the cam cover have been updated and presumably improved.

These are the items to look out for if you are plagued by leaks:

The Sealing washer T1260337 rather than the old T1260309.

The Cam cover gasket T1260904 rather than the old T1260900
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Old 05-06-2011, 03:39 PM   #3 (permalink)
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Originally Posted by Forchetto View Post
Thanks for that. It now looks as if both components responsible for the tiresome leaks reported from the cam cover have been updated and presumably improved.

These are the items to look out for if you are plagued by leaks:

The Sealing washer T1260337 rather than the old T1260309.

The Cam cover gasket T1260904 rather than the old T1260900
Thanks for the follow-up Forchetto! Guess Triumph finally figured out that it's more economical to redesign the gasket than to keep reimbursing dealers for warranty fixes. Probably didn't do well for their company image either
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Old 05-06-2011, 05:23 PM   #4 (permalink)
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am i to take it that the new washers and gasket will work with older bonnies? specifically, am 08 t100?
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Old 05-06-2011, 06:09 PM   #5 (permalink)
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Yes. It doesn't look as if any of the relevant castings have been changed.
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Old 05-07-2011, 04:08 PM   #6 (permalink)
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cool. that is good news. i have ignored my pesky cam cover leak for quite awhile, but was recently thinking about biting the bullet and getting it fixed. nice to know that triumph has finally got off their butt and fixed the cam cover gasket problem. -keith
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Old 05-08-2011, 04:18 AM   #7 (permalink)
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Have to give it to triumph fix a problem? without ever admitting liability fo a problem. To be fair i suppose they are no different from any other producer of goods. It wasnt going to kill anyone except a dealer maybe
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Old 05-08-2011, 10:03 PM   #8 (permalink)
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I wonder how long that has been. I changed mine 2 years ago and it has an outside lip.....
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Old 05-09-2011, 01:24 PM   #9 (permalink)
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Does anyone know if there is a service bulletin on this, or is it just a warranty fix -- if your bike is still under warranty?
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Old 05-09-2011, 01:42 PM   #10 (permalink)
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Does anyone know if there is a service bulletin on this, or is it just a warranty fix -- if your bike is still under warranty?
All this is just conjecture at the moment. Data gathered as we go along.

I would imagine the dealers will get a Service bulletin or at least a web address where they can check to see if the bike they're about to service is subject to any changes.

Wouldn't it be nice if someone in the know from the factory was seconded here for a few hours each month to answer all sorts of questions, eh?.

Forums such as this do a lot for them, sales, loyalty, etc and we can't even share an out of date electronic file of a service manual that has been superceded by a new edition... Pathetic.

And yet you can go to project www.gutenberg.org and download War and Peace for free for your Kindle electronic book.

Last edited by Forchetto; 05-09-2011 at 01:45 PM.
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