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I've got a noise in my gearbox!?
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Topic: I've got a noise in my gearbox!? (Read 2144 times)
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davidwheeler
Permanent resident
Posts: 1183
I've got a noise in my gearbox!?
«
on:
16 October, 2015, 01:48:20 PM »
or at least it sounds as if it is coming from there but back axle noises have been known to be transmitted forwards. It is on the overrun, relates to road speed, is present in gear or out of gear (but less well defined out of gear) and is not related to clutch in/out. It sounds just like the gears on an old fashioned mangle for those of us who remember such things, like the rattling of rather worn straight cut gears. Not heavy at all but quite low pitched and relatively slow. Anyone any ideas please? Gearbox otherwise works very well (apart from 1st/reverse of course) at up to high speeds with no extraneous noises under load.
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
simonandjuliet
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Posts: 2279
Re: I've got a noise in my gearbox!?
«
Reply #1 on:
16 October, 2015, 05:16:15 PM »
Does sound like output shaft or front diff bearing, wonder if you could disconnect the prop and then get the same noise just from engaging gears on the 'box ? That could remove the diff as a source of the noise - but maybe you need some resistance to get the noise
Otherwise, could it be the central prop bearing, but then you would probably get vibration as well
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S1 Aprilia Cabrio, S2 Aprilia, S2 camioncino, S2 furgoncino, , R4 Sinpar, R4 Rodeo, R60 Tractor,R60 S, Moto Guzzi Ercole, Disco 3, Mini ALL4 JCW, Moto Guzzi Cardellino 63,Fulvia Berlina GT, 2019 Royal Enfield Himalayan
davidwheeler
Permanent resident
Posts: 1183
Re: I've got a noise in my gearbox!?
«
Reply #2 on:
18 October, 2015, 03:00:23 PM »
It could be output shaft but I rebuilt the gearbox recently with all new bearings so that is unlikely. I also fitted Ben type prop shaft couplings and the central prop shaft bearing seemed OK then and I would expect that to be noisy on the drive not just the overrun. Could indeed be somewhere in the final drive but I've got a Lambda over the pit for the time being so cannot check that out at the moment. I was just wondering if anyone else had such a noise (like Lambdas have rattling vertical shaft gears)- I only have one Aprilia so nothing to compare it with!
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
simonandjuliet
Permanent resident
Posts: 2279
Re: I've got a noise in my gearbox!?
«
Reply #3 on:
18 October, 2015, 04:13:13 PM »
How long since you fitted the new couplings ? Did the noise start soon after ?
I found that I had to re-adjust the spacing on the propshaft length because although all seemed perfect as soon as I set it up, after a 1000 miles it seemed to "shorten" and then it pulled on the output shaft. A couple of washers and been perfect since
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S1 Aprilia Cabrio, S2 Aprilia, S2 camioncino, S2 furgoncino, , R4 Sinpar, R4 Rodeo, R60 Tractor,R60 S, Moto Guzzi Ercole, Disco 3, Mini ALL4 JCW, Moto Guzzi Cardellino 63,Fulvia Berlina GT, 2019 Royal Enfield Himalayan
davidwheeler
Permanent resident
Posts: 1183
Re: I've got a noise in my gearbox!?
«
Reply #4 on:
24 October, 2015, 08:57:45 AM »
Interesting - as son as I get the Lambda off the pit I'll have a look at that one.
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David Wheeler. Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
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