mookaloid
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| posted on 7/8/09 at 07:23 PM |
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loose prop adapter
just swapping my engine sprocket for the prop adapter, and it won't quite tighten up - i.e. the adapter is still slightly loose even though the
centre bolt is tight.
It seems that the shaft is slightly longer than the depth of the adapter.
I can either shim it, which is my preferred solution or perhaps i should just take a few thou off the end of the shaft with Mr angry grinder or should
I just fit it as it is? does it really matter - the original sprocket seemed to be not tight just the same.
What has everyone else done?
Cheers
Mark
"That thing you're thinking - it wont be that."
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blakep82
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| posted on 7/8/09 at 07:28 PM |
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i'd vote shim
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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RichardK
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| posted on 7/8/09 at 07:30 PM |
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Yep, shim, don't like things sloppy 
R
Gallery updated 11/01/2011
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mookaloid
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| posted on 7/8/09 at 07:30 PM |
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Forgot to ask - if shim is the way to go, where would I get a suitable shim?
"That thing you're thinking - it wont be that."
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mookaloid
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| posted on 7/8/09 at 07:31 PM |
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quote:
Originally posted by RichardK
Yep, shim, don't like things sloppy
R
And what's wrong with sloppy things? I have always been happy to put up with sloppy seconds......
I'll get my coat.......
"That thing you're thinking - it wont be that."
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flak monkey
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| posted on 7/8/09 at 07:41 PM |
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How thick does it need to be? And what sort of size?
David
Sera
http://www.motosera.com
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LBMEFM
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| posted on 7/8/09 at 07:49 PM |
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Mine was the same, I put a shim in and it's fine. Barry
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blakep82
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| posted on 7/8/09 at 07:53 PM |
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washers?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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mookaloid
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| posted on 7/8/09 at 07:55 PM |
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quote:
Originally posted by flak monkey
How thick does it need to be? And what sort of size?
David
I.D 31mm O.D. 38mm and about 0.5mm thick should do it - maybe 0.75mm better too thick than too thin!
beer token on offer to a good man who can make one for me
Do you know anyone David?
Cheers
Mark
"That thing you're thinking - it wont be that."
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flak monkey
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| posted on 7/8/09 at 07:58 PM |
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Hi Mark,
I'll have a look and see what materials I have in stock tomorrow. Defo have some ali, but would be better in steel.
David 
Sera
http://www.motosera.com
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mookaloid
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| posted on 7/8/09 at 08:00 PM |
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I'd be happier with steel too.
"That thing you're thinking - it wont be that."
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Andy B
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| posted on 7/8/09 at 08:12 PM |
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Just a quick point
there should be a slight end float when the bolt and washer is tight. That is to say that the bolt should tighten down onto the gearbox output shaft
and not the adaptor.
If you look at any bikes sprocket you will find this small tolerance.
The reason for this is that if the washer hits the adaptor and then the bolt continues to tighten there is a tendency for the washer to dish slightly.
The thrust and backlash in the dog box then works the washer and slowly undoes the bolt.
We found this with the rgb cars which were forever undoing the main adaptor bolt until we allowed some tolerance.
Hope that helps
regards
Andy
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mookaloid
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| posted on 7/8/09 at 08:38 PM |
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quote:
Originally posted by Andy B
Just a quick point
there should be a slight end float when the bolt and washer is tight. That is to say that the bolt should tighten down onto the gearbox output shaft
and not the adaptor.
If you look at any bikes sprocket you will find this small tolerance.
The reason for this is that if the washer hits the adaptor and then the bolt continues to tighten there is a tendency for the washer to dish slightly.
The thrust and backlash in the dog box then works the washer and slowly undoes the bolt.
We found this with the rgb cars which were forever undoing the main adaptor bolt until we allowed some tolerance.
Hope that helps
regards
Andy
Ah that makes sense thanks Andy. I'll just fit it as it is then
Cheers
Mark
"That thing you're thinking - it wont be that."
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Mark G
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| posted on 7/8/09 at 10:19 PM |
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makes me feel better about my sloppy adaptor now!
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RichardK
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| posted on 7/8/09 at 11:06 PM |
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Slight end float and sloppy are two different things aren't they? If its sloppy I would still pack out to attain slight end float.
If it doesn't seem right....
Cheers
R
Gallery updated 11/01/2011
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