broken cam gear key; 034 turbo kit on 7-A coupe

[Mike Sylvester]

The shaft is not tapered.
You don't need a puller to remove the sprocket.
Once the bolt is loose, the sprocket slides right off.

I've never seen the cam key get sheered.
It didn't damage the key-way?
 
I have seen the key on the crank pulley crack.

Mike

www.urq20v.com

> -------- Original Message --------
> Subject: Re: broken cam gear key;  034 turbo kit on 7-A coupe
> From: Bernie Benz <b.benz at charter.net>
> Date: Wed, June 02, 2010 10:21 am
> To: Tom Egbert <tomegbert1323 at yahoo.com>
> Cc: 200q20V mailing list <200q20v at audifans.com>
> 
> 
> As I recall, correct me if wrong, the Woodruff key is on the  tapered  
> portion of the shaft that fits into the tapered bore of the cam’s TB  
> sprocket. If so, the key is for initial alignment purposes only and  
> the taper fit handles the transmitted torque, IF the taper retaining  
> fastener is sufficiently torqued.
> 
> But why would you replace the sprocket using a sheared  key? And how  
> did the key get sheared in the first place?
> 
> Bernie
> 
> 
> On Jun 2, 2010, at 2:00 AM, Tom Egbert wrote:
> 
> >  The cam pulley has a broken key, will the camshaft spin under load  
> > and mess things up?
> >
> > From: Bernie Benz <b.benz at charter.net>
> > To: Tom Egbert <tomegbert1323 at yahoo.com>
> > Cc: 200q20V mailing list <200q20v at audifans.com>
> > Sent: Tue, June 1, 2010 11:16:23 PM
> > Subject: Re: broken cam gear key; 034 turbo kit on 7-A coupe
> >
> > Please expand on the details of the problem a bit, Tom.
> >
> > Bernie
> >
> >
> > On Jun 1, 2010, at 4:46 PM, Tom Egbert wrote:
> >
> > >  Got caught in situation with son needing car to drive back to  
> > Kansas City from Indy, here is what happened.
> > >
> > >    While installing turbo kit and rebuilt head ; either key was  
> > broken prior t-belt job or it is very fragile, pulled off pulley to  
> > put on final time and key was split. It went in and stayed in place  
> > and the fit is tight and then tightened bolt to torque spec with  
> > stock thick washer in place.
> > >    Son drove to K.C. last night. Ran great,over 30 mpg. no  
> > issues. I told him no getting on it; just drive gingerly until we  
> > know the torque is transferred by the fit and clamp of the  
> > fasteners or get it replaced.
> > >    Any similar situations? Engineering analysis?
> > >                      Nervous Dad,
> > > _______________________________________________
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> > 200q20v
> >
> 
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