Date: Sun, 17 Jun 2001 17:06:20 -0400
Reply-To: Robert Donalds <bostneng@FCL-US.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Robert Donalds <bostneng@FCL-US.NET>
Subject: Boston Bobs history of vanagon hydraulic lifters and the bentley
book
Content-Type: text/plain; charset="iso-8859-1"
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 feed back 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 observations that preloading properly bled lifters will
self adjust in as
little as 10 minutes.
It has been my experience 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
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