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Home » Public Forums » GMCnet » [GMCnet] Reviving the Cad 500  () 1 Vote
Re: [GMCnet] Reviving the Cad 500 [message #164431 is a reply to message #164396] Wed, 28 March 2012 08:00 Go to previous messageGo to previous message
jhbridges is currently offline  jhbridges   United States
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma:
Senior Member
The intent is to ensure that the surface which bolts up to both the transmission and the engine block is flat - i.e. not warped in such a way that the two are being held at an angle.  If the trans nput shaft and the crankshaft centerline aren't precisely parallel, will not this put a bit of an end load on one or both due to a flex in the drive chain?  I expect the drive system is designed to tolerate substantial side loads on the sprockets, but there's not likely to be a lot of provision for end loading, since in normal operation there hadn't ought to be any.
It's a very unlikely scenario admittedly... but you're down to the 'unlikelies' at this point, are you not?  Easy to check at any rate.
 
--johnny
 
'76 23' transmode norris
'76 palm beach

From: Ken Henderson <hend4800@bellsouth.net>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, March 27, 2012 10:20 PM
Subject: Re: [GMCnet] Reviving the Cad 500

Johnny,

IF I bother to do anything more to the now-installed 425, I'll certainly
check everything I can learn of to ensure that it's all OK.  But I'm not
sure what surface you're proposing I check:  You say check with the chain
off, then mention removing the dowels -- which are on opposite sides of the
bell housing, and the dowels are in the block, not the transmission.

I do have access to a large granite precision surface block if needed.

Please clarify.

Ken H.



On Tue, Mar 27, 2012 at 8:34 PM, Johnny Bridges wrote:

>
>
> Ken -
>
> Just for the hell of it, when you got the chain cover off next time, take
> a straightedge to the mating face and convince yourself it's truly flat.  I
> can see where even a minor warp or twist would introduce some strange loads
> on everything it's bolted to.  Set it on a mill table if you know someone
> who has one large enough, with the dowels out.
>
>
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell
 
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