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Question 911 valve adjusters on early rockers

I am rebuilding the heads on a 73 2.0. Heads have been fly cut, new valves, guides and seats installed. Switching to 911 type adjusters. How much material has to be removed from the rocker to adequately compensate for this type of adjuster?? What is the most reasonable way to machine the rocker??
Suggestions would be appreciated.
Thanks, Mike

Old 07-23-2002, 06:39 PM
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DDS DDS is offline
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Hi Mike:

You have to remove about .060", maybe up to .090" according to some. I just used a bench grinder, being careful not to get the arm too hot.

Who did your machining and where is St. David's?
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Old 07-23-2002, 08:15 PM
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I took my freindly machinist a 6-pack and he milled .080" off in nothing flat!

Just make sure your rockers are the right thread size first. Some of the later rockers used a larger adjusting screw....
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Old 07-26-2002, 04:47 PM
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Thanks DDS and Mr914 for the info. Will take off about 0.080". The rockers I'm using are the original 73 2.0, which take the 8 mm adjusters. DDS will email you the info on the machine shops. St. Davids is part of Niagara on the Lake.
Thanks again
Old 07-26-2002, 05:24 PM
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Make sure you use the 911 adjusters.

The aftermarket ones for VW are junk.
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Old 07-27-2002, 06:25 AM
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I second the recommend of using only the Porsche made adjusters! The Bugpack or other brands wear out in less than 1000 miles! They are just too soft and pound out the inner part of the foot. (ask me how I know!)
Geoff
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Old 07-27-2002, 11:23 AM
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Three places for adjustment--the face of the rocker, the rocker stand/head interface, and the pushrod length.

I have heard 0.060 inches off the rocker face, plus a small bit of shim between the rocker stand and the head, plus changing the length of the pushrod. If you want to do the job right, you will wind up checking the valve geometry so that the adjuster is parallel to the valve when the valve is at half lift. (This helps minimize the wear on the valve tip and the valve guide.) Its not easy work, and from the sound of it takes quite a while. Raby has commented on the procedure a number of times over on the Shoptalk Forums Type IV BBS.

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Old 07-29-2002, 07:05 AM
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Just finishing that and was helped by a recent thread on the shoptalk forums. Its a fiddly job, and as I went along I kept figuring out simpler ways to do it. - oops, twins howling gotta go.

You can get the shims from home depot 'spacer washers' about .030 each and make an adjustable pushrod ..... Ah, damn, more later.
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Old 07-29-2002, 05:49 PM
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Bleyseng,

Are these the aftermarket adjusters that you have had fail?
http://images.prosperpoint.com/1070/54506-82.jpg

I installed a set of these allen head adjusters in my 71, 1.7L car and had no problem for two years of daily use, including autocrosses. (Sold the car).
There is another type of aftermarket swivel adjuster which has a much smaller face called a "ball foot" adjuster. Are both of these type adjusters considered unacceptable?
BTW, both types are sold by EMPI.
Phil

Old 07-30-2002, 05:49 AM
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