[T3] Push-rod length...

[Jim Adney]

On 30 Dec 2010 at 17:56, Bobsnotch at aol.com wrote:

> In a message dated 12/29/2010 9:21:23 P.M. Eastern Standard Time,  
> jadney at vwtype3.org writes:

> >  According to the Blue Bentley (61 to 67), there are 2 basic (starting  
> > point) measurements. The first is for single circuit  master  cylinders,
> > it's 143.5+ - 5mm. The second basic measurement  is 149.5mm + - .5mm.

> I think we've been down this road before. It  appears that someone 
> made a mistake in the dimension, at least for the  tandem MCs. I've 
> never seen a published number that agreed with the  untampered late 
> pushrods that I've measured.  
> 
> The number I've  recorded for my own use is 152-153 mm.

> I just pulled those numbers out of the blue Bentley. It's actually the  
> starting point for adjustments that the factory made to each car to allow for  
> manufacturing tolerances. It's measurement is from the tip to the center of 
> the  hole (to attach the brake pedal). You still have to keep the 1mm 
> clearance of  the rod to cylinder.  

It sounds like the blue Bentley has just repeated the mistakes of the 
past manuals. Unless your second number was meant to be +- 5 mm 
(rather than .5 mm) I've never seen one within that range.

If it's +- 5 mm, then it seems odd that the ones I've measured all 
fall within a small space at the upper end of that range.

I think we're all in agreement about this being a starting point for 
a factory adjustment, plus the 1 mm of free play.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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