Re: [T2] hyd. valve adjst.

[Volks-Web Support <support@xxxxxxxxxxxxx>]

Wasn't Bob Donalds gonna post his hyd valve update to Bentley?  I sure
would like to see that.  Anyone know?

> >Fellow Vanagon types:
> 
> >I have been reading the posts on adjusting lifters with interest, as I am
> >currently putting together an article on my experience with vanagon hydraulic
> >lifters. The vanagon book published by Bentley is about to be reprinted.
> For >years, Bentley Publishing has worked hard to review comments from the
> those >that have taken the time to write or phone things in that they felt
> needed to >be corrected or clarified every time the book is reprinted. The
> next printing
> >will include some 50 changes. One of these changes will be about bleeding
> >and adjusting the hydraulic lifters. There were 2 versions of how to bleed
> >the air out of the hydraulic lifter before installation. They where on pages
> >15.7 and 15.24. both where confusing and vague. Bentley also has in the
> >vanagon CD (released last year) added what they call an "editors note".
> This >note says, in part, that there is a problem with hydraulic lifters
> becoming >air bound and that preloading hydraulic valves should be
> considered optional. >This editors note will also be in the newest printing
> of the big green book.
> 
> >  With the help of Erin at AVP, plus the constant feedback from my
> >customers and the nice people of this list, I have come up with a simple
> >method for removing all the air from the hydraulic lifters prior to
> >installation. This method does not solve or prevent the lifters from pulling
> >in air after the engine has been sitting and it is not a solution for air
> >bound lifters that DO expand when the engine heats up. Air bound lifters DO
> >hold the valves when the engine warms up. The 006.ths clearance cold is
> >needed when air is present in the lifters 0 lash will not do. The most
> common >symptoms of air bound lifters are poor performance running rich and
> low >manifold vacuum. It has been my observation that preloading properly
> bled >lifters will self-adjust in as little as 10 minutes. It has been my
> experience  >that air bound lifters will NEVER self-adjust when preloaded
> or bleed because >of the air that is trapped above the check valve. The
> extent of the problem >varies widely. I know there will be those that
> disagree with me. My completed >article will be posted on my web site in
> the very near future.
> 
> >Bob Donalds
> >http://www.bostonengine.com