Oil leak under sprocket cover?? - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #11 of 18 (permalink) Old 06-21-2017, 04:01 PM
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Quick update: It was in fact a small leak from the gear position sensor gasket. They didnt have a gasket in stock so they sealed it somehow. If it happens again they will order and replace the gasket.
It's an "O" ring measuring 26.65mmID X 2.62mm cross section diameter, listed as part number T3600267 costing 1.56 although you can buy them anywhere, Google those dimensions 26.65x2.62 for sources.

I'm amazed a fully-grown shop can't produce one of them, I probably have some kicking around in my shed...or I can walk to one of the local engineering and seal/bearing suppliers and get one.
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post #12 of 18 (permalink) Old 06-26-2017, 02:30 PM Thread Starter
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Update to "oil leak under sprocket cover";
With a little over 100 miles since cleaning off the accumulated chain lube, there appears to be no oil leak from either the gear position sensor or the other electrical unit near it. So, lesson learned here is that, depending how fastidious you like to be with your machine, it might be a good idea to periodically remove the sprocket cover and degrease that area to ensure that the chain lube is not covering a leak from the output shaft or something else.
Thanks to all that furnished some input here.
Watch out for those left turning vehicles (LTV's)!
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post #13 of 18 (permalink) Old 02-01-2019, 10:28 AM
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Having the same problem on my '16 TTR - took the sensor out last weekend and found 2 O'rings, both pretty hard already. The Triumph parts diagram however only shows 1 O-ring - anybody else found 2?
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post #14 of 18 (permalink) Old 02-02-2019, 04:44 AM
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Having the same problem on my '16 TTR - took the sensor out last weekend and found 2 O'rings, both pretty hard already. The Triumph parts diagram however only shows 1 O-ring - anybody else found 2?

In this listing for a Thruxton it does show two "O" rings, see part 20:


https://www.worldoftriumph.com/parts...100075762-1-2/
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post #15 of 18 (permalink) Old 02-02-2019, 10:05 AM Thread Starter
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In order to remove the sensor you will have to loosen and push aside the hose that runs tightly to it on the left. Its clamp is held on by a very short bolt, and will easily strip the threads in the aluminum case bore if it is not gently tightened. The good news is that the threaded bore is quite deep and a longer bolt can easily be fitted. Always a good idea to clean steel bolt threads, and apply a little light grease before carefully tightening into an aluminum alloy. Particularly, like the four that hold the sprocket cover on.
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post #16 of 18 (permalink) Old 02-04-2019, 12:05 AM
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Had same issue on my TTR. Shop replaced both O rings, and so far, no leak.
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post #17 of 18 (permalink) Old 02-04-2019, 10:03 AM
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Got in there yesterday and added the 2nd O-ring back in - thanks for the info.
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post #18 of 18 (permalink) Old 02-24-2019, 05:30 PM
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My 2018 T120 leaked there from around 8,000kms. Dealer took 3 goes to get it right - 1st time, just removed, cleaned & re-fitted. 2nd time, removed & siliconed. 3rd time, replaced O rings & re-sealed. No problem since. A lot of them do leak there........
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