CLUTCH SQUARE 4

Singles, twins and fours.
william shortall
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CLUTCH SQUARE 4

Postby william shortall » Sun Jan 05, 2020 3:31 pm

the clutch has been taken off the bike and the inner chain case has been welded and dressed up but it looks like the clutch basket has been rubbing against this as there are marks on the back of the basket and inner chain case .
Has anybody seen this before and what could be the cause

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Paul_Linden
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Re: CLUTCH SQUARE 4

Postby Paul_Linden » Sun Jan 05, 2020 9:58 pm

I would guess that nearly every square four that is still in use shows some historic “wear and tear” similar to what you describe.
After 60 years many have had at some point a loose clutch basket or misaligned primary cover.......
Pictures would help here, but until sight of the damage I suggest you check the bolt at the bottom of the primary case, as this can pull the case in away from the clutch basket.
Ariel Square 4 mk2, Ariel Square 4 mk3 (yes, really), Ariel Colt, Matchless G12, BSA C12. Room for one more......

william shortall
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Re: CLUTCH SQUARE 4

Postby william shortall » Mon Jan 06, 2020 2:29 pm

many thanks im just feeling my way round at the moment and any advice is welcome

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simon.holyfield
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Re: CLUTCH SQUARE 4

Postby simon.holyfield » Mon Jan 06, 2020 5:23 pm

Paul_Linden wrote:Pictures would help here, but until sight of the damage I suggest you check the bolt at the bottom of the primary case, as this can pull the case in away from the clutch basket.


On my Mk1, there is a 1/2" long spacer between the frame lug and the back of the primary case which locates the case in relation to the mainshaft. If that is wrong or absent, the case will be stressed and the basket/sprocket/case clearance will be wrong.
cheers

Simes

'51 Square Four,
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http://ariel-square-four.blogspot.com

william shortall
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Re: CLUTCH SQUARE 4

Postby william shortall » Fri Jan 24, 2020 2:51 pm

Brilliant thank form your answer it gives me something to look at

JohnnyBeckett
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Re: CLUTCH SQUARE 4

Postby JohnnyBeckett » Fri Jan 24, 2020 6:07 pm

HI have you look at the mineshaft bushes and bearing i had a basket rubbing and it was the gearbox mainshaft bushes or( 4 gear bushes) that was letting the basket move and rubbing the case i change the bushes and bearing and it is now ok :?:

keith wainwright
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Re: CLUTCH SQUARE 4

Postby keith wainwright » Sat Jan 25, 2020 11:33 am

I have had the same problem the mainshaft bushes worn allowing movent on the clutch basket. Also check the mainshaft roller bearing for wear also.

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Re: CLUTCH SQUARE 4

Postby camstevens » Sun Jan 26, 2020 10:01 am

Hi
Regarding the tie bolt (primary case to frame), to avoid spacer issues I used a fully threaded bolt (technically a screw?) and used a lock nut behind the case to position and lock. Seems to have worked.

Cam


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