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Re: A65 Tiiming Side Main Bearing - No Lip [Re: Andy Lorenz] #721147
01/05/18 12:54 pm
01/05/18 12:54 pm
Joined: May 2013
Posts: 4,678
Rotherham - S. Yorkshire
Allan Gill Online happy
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Allan Gill  Online Happy
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Didn't think you were wittering on Nick, Always interested to hear from experienced people (regardless of the subject) and often my questions are oppositions are that until I find out why... (like needing the end float limited to reduce/stop bearing movement).

I was thinking of screwing it down the case also as you did. From memory the bearing is 27mm, i had a 4mm spacer made up. On hind sight it could have been a couple of mm thicker, more so even, then made with a wider surface area for thurst control.

Do you have any drawings/photos of the work you did, would be interesting to compare ideas (and possibly pinch ideas too wink )


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Re: A65 Tiiming Side Main Bearing - No Lip [Re: Andy Lorenz] #721168
01/05/18 4:35 pm
01/05/18 4:35 pm
Joined: Jan 2004
Posts: 3,574
ca, us
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DMadigan Online content
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DMadigan  Online Content
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Nick, Charlie Barnes made a steel insert for the drive side bearing on triples that wore out the bore. Possibly that could be done for your blown out case. An inside lip (DS) for the bearing and an outside lip (TS) for the case.

Re: A65 Tiiming Side Main Bearing - No Lip [Re: Andy Lorenz] #721170
01/05/18 4:57 pm
01/05/18 4:57 pm
Joined: Feb 2008
Posts: 4,142
New Jersey USA
Tridentman Online content

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Implying presumably that when hot the bearing outer moves and even rotates in the crankcase bearing bore?

Re: A65 Tiiming Side Main Bearing - No Lip [Re: Andy Lorenz] #721213
01/05/18 10:35 pm
01/05/18 10:35 pm
Joined: Jan 2014
Posts: 3,425
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NickL Offline
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NickL  Offline
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I see what you mean Dave, thanks for the heads up, I did think about sleeves/inserts of various types but
really the route i'm taking is the easiest way. I didn't even need to 'glue' the broken piece back on as it's
not doing anything anyway. The primary side will be open to crankcase so no need for a seal, like triumph.
I know it doesn't sound (or look) very elegant but it also means that i don't have to farm out more machining
to people i am uncertain about. It took me long enough to get someone who would do the line boring and
counter boring of the timing side, i don't want to push my luck trying to get stepped sleeves made and fitted too.
I've assembled the crank with dummy spacers etc and the old TS bush and all seems OK, so as the new bush
is on it's way i'll carry on with it.

Allan, that engine is long gone and i never had any photo's of the setup. It was straightforward enough though.
If the OD of your needle race is 47mm (normal one to use) the thrust can be made to just slip over it and run
on the machined flat on the crank web. As the race projects into the case the thrust can have a step allowing
the fixings with no interference.



Re: A65 Tiiming Side Main Bearing - No Lip [Re: Tridentman] #721220
01/05/18 11:18 pm
01/05/18 11:18 pm
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NickL Offline
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NickL  Offline
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Originally Posted by Tridentman
Implying presumably that when hot the bearing outer moves and even rotates in the crankcase bearing bore?


My own paranoia i suppose, but i always shimmed up Triumph mains as well for the same reason.
Plus with the beezer the oil pump is 'tugging' at that bearing.



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