Please keep us informed on what you find out about this. I plan to go to
.006 soon.

Thanks,
Mark Ingalls
85 GL

>From: Tim Marciniak <tmarciniak@WI.RR.COM>
>Reply-To: tmarciniak@WI.RR.COM
>To: vanagon@GERRY.VANAGON.COM
>Subject: Losing valve lash just after adjustment-why?
>Date: Thu, 29 Aug 2002 20:38:37 -0500
>
>Just did a compression test and two cylinders were low @ 100 and 106.
>Heads done about 20,000 miles ago by a VW mechanic (not dealer).  Van
>has ran pretty well since them but lately I have developed a lumpy
>idle and low manifold vacuum (10-12).  I researched everything I
>could find on the age old valve lifter issue including a call to Bob
>at Boston Engine were I purchased my heads from.  Followed his
>instructions and adjusted the valves to .006 inch valve lash.  I
>adjusted both intake and exhaust when engine cold.  Just to be really
>thorough I rechecked them almost immediately after I adjusted them
>(did not rotate the crank yet) and I swear I was back to zero
>clearance so I readjusted again but did not recheck again cause i
>wanted to finish and the mosquitos were really bad last nite.  I also
>checked all the valves for clearance before I adjusted and I could
>not get a .006 inch feeler gauge in on any of them--I am suspected my
>mechanic may of installed these heads the old way (preloading) and I
>am starting to see problems  now.  My question is why did I lose this
>.006 inch clearance just moments after I made the adjustment?
>
>I did start the engine up after adjusting all the valves and it ran
>pretty much the same, initially the manifold vacuum was about 14 but
>then dropped to 11-12 after the engine warmed up and idle was lumpy.
>
>Could it be the lifters are doing something strange?  I am running
>20W-50 for the summer.
>
>Tim
>--

Mark Ingalls
Nebraska City
85 GL w/ dash mounted digi-tool, H4s with relays, Agilis tires, needs a
stereo.....

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