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Re: T140 Left Hand side engine (?) noise [Re: DaveG] #786473 10/07/19 3:54 pm
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DMadigan Offline
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Why not run the engine without the chain to see if the noise is still there?

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Re: T140 Left Hand side engine (?) noise [Re: DaveG] #786503 10/07/19 9:15 pm
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Tigernuts Offline
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Hmmm, I'm scraping the barrel for ideas now, but I have got one. Your use of the word 'whirring' is interesting. I;d been thinking it was more of a clacking sound, which is what mine was making. But whirring is a bit different.

A friend has a 3TA. He had hassles with oil spewing out everywhere, including the gearbox. He fitted a gasket behind the inner cover, which helped reduce the leakage, but since then, it has made whirring noise. He demonstrated it when he rode it over to mine the other day. My thought was that by fitting the gasket, the mainshaft has been moved several thou to the right, making the primary chain sufficiently mis-aligned to cause the whirring sound. The only problem with applying this theory to your bike is that his whirring occurs with the gearbox in neural whereas yours only occurs when in gear and the clutch engaged (therefore, when underway).

I suppose there's more tension on the upper run of the primary chain when in gear and pulling, which might make the noise a little bit louder, ie: enough to be heard? Could it be something like this, do you think?


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Re: T140 Left Hand side engine (?) noise [Re: DaveG] #786632 10/09/19 10:56 am
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DaveG Offline OP
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Ok I am moving forward, I can't get the whirring back on jack with the bike running in gear - nothing AND I identified the clacking noise as the secondary drive chain hitting the engine mounting bolt that I had installed with the head of the bolt out instead of inside! All is back together awaiting next dry spell for another road test. BTW I also loosened the clutch spring nuts a little as they were farther in than just level with the plate as the manual suggested. Will update tomorrow.

Thanks all for comments

Re: T140 Left Hand side engine (?) noise [Re: DaveG] #786723 10/10/19 7:03 pm
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DaveG Offline OP
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Ok today's update, after having reversed the bolt and readjusted the pressure plate, and both banging and whirring noises have gone! There is still something banging around but I am really happy to get to the bottom of all this! I now have a nearly new primary chain case (innards) and gearbox!

Thanks to all for your help and if anyone is looking for a bike oriented vote near Grenoble don't hesitate to look up Gite entre 2 temps on the web or airbnb

Re: T140 Left Hand side engine (?) noise [Re: DaveG] #786732 10/10/19 9:49 pm
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Tigernuts Offline
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Really glad you got it sorted Dave - these things can drive a man mad! Like the website & F'book page by the way. I may ride over there next year some time.


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