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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 11-02-2012, 02:14 PM   #11 (permalink)
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I fitted crankcase no return valve ..works like champ
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Old 11-02-2012, 11:37 PM   #12 (permalink)
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Quote:
Originally Posted by PieMan View Post
If the seal is at the end of it's life, it doesn't matter where you put the hose, oil will spew out at higher revs and higher throttle opening. Changing the seal is the only option.
Also, replace the rotary breather disc (plastic disc with the metal tubing that the seal rides on) at the same time... I would bet dollars to donuts that there is a slight groove worn on the tubing where the seal contacts it...

There is a specific procedure for pre-stretching/sizing the seal using a factory plastic piece. After the clutch cover installation, you should wait 30 min to an hour before firing up the engine to let the seal seat on the tubing.

And yes, I've done the replacement... cured the problem...
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Old 11-03-2012, 03:14 AM   #13 (permalink)
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This one had passed me by but now I've checked my engine number and its in the 180000's. How prevalent is this problem among affected engine numbers, and what's the reason some play up and some don't...the way it was built, a bad batch of o rings, long lay offs drying the seals?
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Old 11-03-2012, 05:20 AM   #14 (permalink)
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what's the reason some play up and some don't...the way it was built, a bad batch of o rings, long lay offs drying the seals?
Mileage I suppose. The seal has to stand up to a rotating action and it wears out with use.
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Old 11-03-2012, 05:39 AM   #15 (permalink)
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yeah, mileage and heat build up. My personal 04 Bonnie has got through one every 5,000 miles for the last 15,000 miles, but it does go on the dyno quite often, which can build up heat in the engine.
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Old 11-03-2012, 09:38 AM   #16 (permalink)
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yeah, mileage and heat build up. My personal 04 Bonnie has got through one every 5,000 miles for the last 15,000 miles, but it does go on the dyno quite often, which can build up heat in the engine.
I'm guessing that there are plenty that don't have the problem at all, even after considerable miles...
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Old 11-03-2012, 05:39 PM   #17 (permalink)
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Some last along time some dont its like any other seal or gasket it bites you when it wants to lol.SC is right any time you replace a seal insect where the seal rides if its worn replace it.If you dont the seal wont last as long.
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