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Re: [T3] Distributor Drive Question

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.

>  Since cylinder #3 had a tendency to run hotter, 
> preignite more and burn more valves the timing for that cylinder was 
> retarded. A special rocker arm stud kit was released to allow retrofit of 
> early heads to accomidate the .006" valve adjustment spec. My understanding 
> is that these changes did help make the VW engine more reliable and longer 
> lasting.
The rocker kits were never available from VW. They were to repair
another problem. The rocker studs would pull out of the head. VW said to
replace the head. Hate to say it :) but darksiders designed the repair.
(Empi). But yes, VW redesigned the head starting in '65. They also
changed the design of the rockers. I don't know if they changed the
rocker ratio or not, but the mounting changed with the head change.

Russ Wolfe
'71 FB AT
'66 FB MT
'64 T34 (not running)
'65 T1 (not running)

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