Date: Thu, 28 Jun 2007 17:58:49 -0400
Reply-To: Mike S <mikes@FLATSURFACE.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mike S <mikes@FLATSURFACE.COM>
Subject: Re: Hydraulic Lifter Adjustments
In-Reply-To: <46842378.8000303@gmail.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 05:09 PM 6/28/2007, vanagonvw wrote...
When you say that if I turn the screw, it won't open the valve, yet is
>surely does, as the leak test shows that with zero lash, I am fine,
>but
>half a turn in, and the valve pushes open, and the test is a
>failure..... I have the clyinder pumped to 90psi, it leaks down to
>80psi
>with zero lash. Half a turn down, and the leak goes to 20psi which I
>guess means I opened the valve <shrug> Since I think you are right,
>and
>I am blanking out, any way to explain what I am seeing?
It may be that the lifter is defective, and is stuck.
With a properly operating lifter, you could open up the adjustment
leaving a big air gap, wait some undefined amount of time (maybe
hours), and the lifter would expand to its maximum length. You would
then adjust to contact plus a turn or two. That might open the valve
until the lifter again adjusted to the new setting (maybe hours). The
lifter may have sucked in air to expand, so then you might need to
drive around for some undefined amount of time (maybe days) to get the
air replaced with oil. *** If you then went to adjust, "contact" might
seem to be the current adjustment, going 1 in might open the valve.
Waiting an undefined amount of time (maybe hours), the lifter would
compress and the valve would close. If you repeated this process from
the *** above, eventually you would run out of adjustment range and the
valve would never close. It is possible you have a good lifter, and
that's where you are.
AIR, you started with an open valve, and adjusted to contact. You may
simply have the lifter which is fully compressed and at the end of its
adjustment range.
Test: Adjust it to a known gap (maybe 2 turns _out_ from contact,
better yet use a feeler gauge), let it sit overnight, and see if the
gap gets smaller. If it gets smaller, wait some more and check again.
If it completely takes up the gap, do it again until it doesn't. Be
patient, and wait until the lifter expands fully. Then adjust to
contact plus a turn or two.
If your lifter is stuck, then it's acting like a solid lifter, and no
matter what you do, the adjustment is going to stay about the same
(except due to a change in temperature or wear).
|