[Fot] early TR3 input shaft question

[Bob Kramer]

I had a little time this weekend to work on the early TR3 tranny again and I test fitted the gears on the mainshaft. This early box has the funky three eared thrust washer, with holes.

I have two questions I hope can be answered. The three eared washer locks onto the splines on the mainshaft but there is a significant gap for the hub to slide on the mainshaft. Is that hub supposed to slide or does another washer go in front ? And, why the holes? 

I don't see the extra washer in parts books.

I'm getting a custom bushing made to use a TR4 input shaft on the early mainshaft.

Thanks in advance.

Sent from my iPhone

> On Aug 19, 2015, at 7:35 PM, malaboge at aol.com wrote:
> 
> I agree, loose is the way to go with that bushing. The original style also had a chamfered edge on the rear of the inside diameter, probably to help the insertion of the third motion shaft into that bushing. The nose of the original third motion shaft (rear mainshaft) had a scroll cut into it to help lubrication, but the original bushings were smooth on both inside and out.
> 
> I think the factory went to the larger needle style bearing to alleviate the wear issue in the bushing as it allowed the trans to pop out of third gear on decel when that bushing got worn enough to allow movement at that interface.
> 
> Good luck and check the triangular thrust spacer at the back of the box for cracks emanating from the corners of the teeth cut into it.
> 
> my bushings are a bit worn as well...
> Nick in Nor Cal
> 
> 
> 
> -----Original Message-----
> From: rkramer3 <rkramer3 at austin.rr.com>
> To: Enquiries Road & Track <enquiries at roadandtrack.net.au>; fot <fot at autox.team.net>
> Sent: Wed, Aug 19, 2015 3:01 pm
> Subject: Re: [Fot] early TR3 input shaft question
> 
> 
> 
> 
> That's the type of info I was looking for. Thanks Terry 
> 
>  Bob Kramer 
> 
>  rkramer3 at austin.rr.com 
> 
>   
> 
>  ---- Enquiries Road & Track <enquiries at roadandtrack.net.au> wrote:  
> 
>  > the hard bronze bush system was used on all vanguards and non syncro TR;s. 
> 
>  > The bush needs to float between main-shaft spigot and input shaft inner, so 
> 
>  > about 0.003" clearance both inside and outside. we always made them with a 
> 
>  > deep cut spiral in them to transfer oil. they will feel sloppy and the 
> 
>  > input shaft will move around, but its no hassle in a race car box that 
> 
>  > comes apart regularly and is not expected to last 100,000 miles. Use LG3 
> 
>  > spec bronze material to make them 
> 
>  >  
> 
>  > Terry 
> 
>   
> 
> 
> 
>  
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20150823/d6f89701/attachment-0001.htm>