Date: Thu, 25 Nov 1999 09:46:01 -0800
Reply-To: "T.P. Stephens" <doktortim@ROCKISLAND.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "T.P. Stephens" <doktortim@ROCKISLAND.COM>
Subject: Re: Wasserleaker Head Job - What am I getting myself in for
In-Reply-To: <3.0.32.19991125084439.007e3c10@127.0.0.1>
Content-Type: text/plain; charset="us-ascii"
At 09:44 AM 11/25/1999 -0500, you wrote:
>As for special tools, only a torque wrench if you are only doing the head
>gaskets and don't have to mess with cylinders.
And do note that a clicker type wrench won't do, a beam type is specified
for reasons determined by the Neanderthal Engineers. Things like, long
special alloy steel head studs with special sealant under the head nuts
while torquing, just off the top uff mein noggin, above the brow ridge.
In my case, the
>wasserleaker's heads were OK, a bad coolant pipe had been the culprit for
>the coolant leak.
I must suggest the foundation of the problem is not the cooroded pipe, but
the source of the coorosion. Improper and/or inadequate maintainence for
desired result and/or combined with non-spec coolant.
But while I was in there, I found that one of the pistons
>was about to self-destruct, necessitating the more indepth teardown.
Due to overheating because you didn't monitor your coolant tank and noted
more addition of coolant than has been required in your past rates, known
by your past notes and thereby noted a leak was progressing somewhere by
empirical DATA, therefore, knew to find the mystery leak before you
billowed steam and cracked or holed a piston. The coorosion founded upon
inadequet or non spec procedures is again the foundation of the problem,
rather than enhanced given spec and procedures desugned obtain the desired
results of no coorosion ever getting started.
When I do this procedure, WasserLeaker heads, I have 2 legal pad sizes
pages of notes by the time I'm done. It starts with a complete patient
history of past parts/supplies/services documented. That's before I do the
estimate for the parent (owner). I look for the gaps in verified
maintenance, any recent or past procedures, spec or non spec fluids/parts.
I discriminate.
If I see a past compression test listed, but no figures, it provides not
the data that would have value. If I see one that shows 135/125/130/120,
they need better guages or need to learn the concept of interpolation or
more probably both. But poor data is better than no data. I can look to
more of their invoices in this or any other patient history and know at
least compromised data is available. If I see also they use polypropalene
glycol, I know they are not associated with spec fluid or don't much care
about spec. It is proof I should not trust their engineering sence. They
don't know, and they don't care that they don't know. I will validate what
I can of their work.
If I see, similar to my invoice, "134/127/129/122, spec = 110-138, variance
less than 10%", I know the motor was getting weak on variance. I want to
update those numbers to see if wear has progressed further. If no. 4 is now
112, I do a leakdown test to confirm a valve going south as the cause of
the problem and not the rings, and I know to add head replacement. If I see
leakdown by the rings or pistons getting poor, I know to add a long block
reman or new into the procedures.
All that can be known about the patient should be known if you want to
identify the true source of the problem before you assume what limit or
extent of the procedures are required to put the patient right for use again.
The officail tools
>are probably more efficient, I only expected to do this job once or twice
>in my life.
With adequate enhanced spec maintenance, once every 30 years is possable.
And you will have the records to found that success upon and prove what
works with empirical data.
Doktor Tim
Maintenance Repair and Restoration of European Vehicles
San Juan Island, WA