Re: [T3] Distributor Drive Question

[Jens Vagelpohl <jens@type4.org>]

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On Feb 11, 2005, at 19:02, Russ Wolfe wrote:
> On Fri, 2005-02-11 at 11:20, joshua brooks wrote:
> > The story I heard regarding this issue is that overheating and burning
> > valves had always been the biggest reliability problems in early
> > volkswagens. In the 60's VW decided to try and resolve these 
> > problems. The
> > first solution was .006" valve clearance spec for all 
> > engines.(previosly
> > 004" in many models)
>
> The .004 valve adjustment ended with the 36hp and started again in '65
> on the 40hp. They didn't change the adjustment to .006 until I think it
> was '68.

That change of valve adjustment had a slightly different reason.

On heads that have the .004" adjustment the valve clearance grows 
slightly as the engine warms up. On those with the .006" adjustment it 
was the other way around, it actually shrank. That scheme must have 
caused more problems than before, so the old configuration was 
reintroduced after a very short time.

jens

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