Author Topic: Gearbox squeal!  (Read 524 times)

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DEAN SOUTHALL

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Gearbox squeal!
« on: 07 April, 2017, 09:05:38 »
I  took the Super Rocket out yesterday for its MOT. As I pulled away there was a loud squeal from the gearbox (in gear and clutch engaged, ie driving). I recall it did similar last time I had her out in November. She tends to stand around most of the year waiting to be used. The squeal goes after a few seconds but might re-appear once or twice in the first few hundred yards and then clear

I am thinking bush spinning? Time to get the gearbox out and stripped.

Any thoughts?

(this will teach me to call her the bike that's all sorted and just for using!)

JulianS

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Re: Gearbox squeal!
« Reply #1 on: 07 April, 2017, 12:30:04 »
Could be lubrication lacking after standing.

Reminded me of this C15 service sheet and a reported squeal. Though I do not suggest adding extra oil to the SR!
« Last Edit: 07 April, 2017, 12:32:05 by JulianS »

DEAN SOUTHALL

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Re: Gearbox squeal!
« Reply #2 on: 07 April, 2017, 12:42:41 »
Julian
Lack of lubrication makes sense.
I am wondering of this could lead to the bush rotating. In which case the lubrication hole will not longer line up with the oil hole in the casing. I guess its a 'box strip down to check GRRRRRRR.

JulianS

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Re: Gearbox squeal!
« Reply #3 on: 07 April, 2017, 13:37:43 »
The sleeve gear bushes are usually tight in the gear and I have never seen one spin over the years, however who knows.

If it was mine I would drain the box and seen how much oil and what else comes out.

If the oil was low and no other bits came out I would refill and try again.

The right amount of oil or any other bits and I would strip it.

DEAN SOUTHALL

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Re: Gearbox squeal!
« Reply #4 on: 07 April, 2017, 21:42:31 »
Checked and oil level was a bit low. I forgot the layshaft sat lower in the box so its unlikely that this was dry.
Julian, I'll follow up your suggestion and drain the box and see if anything untoward emerges.
Noise has not returned so  maybe the mainshaft was just a bit dry from standing.

STAR TWIN

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Re: Gearbox squeal!
« Reply #5 on: 08 April, 2017, 22:53:42 »
Last time I came across this was in a B40 with insufficient oil in the gearbox. I would go with a drain and refill and see how it goes. It worked with the B40.

DEAN SOUTHALL

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Re: Gearbox squeal!
« Reply #6 on: 09 April, 2017, 10:35:13 »
Thanks for the advice guys.

I've drained and refilled the gearbox. Did not find anything in the old oil and no bits fell out ;) :)

I'll see how it goes but it hasn't returned since the initial few yards so probably just a dry mainshaft.
Not to self....use the bike more often!