Try this link, Its everything I know and some info I've plagiarized from
other sites.
http://williamwareagency.com/forsale/stanvan/buyused.htm
Stan Wilder

On Thu, 2 May 2002 16:23:53 -0600 "Thompson, Michael"
<METhompson@GOLDER.COM> writes:
> Following helpful suggestions from the Vanagon community I took my
> leaky
> aircooled Westy for a leak-down test.  The reported test values are
> as
> follows:
> Cyl 1   100/30 psi
> Cyl 2 100/62 psi
> Cyl 3 100/44 psi
> Cyl 4 100/50 psi
>
> The garage says that the air could clearly be heard coming from the
> crankcase breather. These strike me as very poor results indicating
> the
> engine is in a very poor state and requires a full rebuild (as
> recommended
> by this garage - new pistons, rings and barrels as a minimum).
> Before buying
> the vehicle, I took it to a reputable VW specialist who said the
> engine was
> good.   I have spoken with them regarding these new results and they
> cannot
> believe it and want to carry out their own leak-down test.
>
> Now what I don't understand is the following:
> 1       The engine starts and runs well and has never failed me in 5
> weeks
> use (and that includes -15 degrees in Calgary).
> 2       The engine burns some oil but nothing exceptional for a
> 100,000 mile
> engine.  Slight blue smoke on acceleration.
> 3       I have monitored the air coming from the breather at idle
> and higher
> revs and it is not particularly blue or smokey.
> 4       I have oil leaking from the 2 main crank seals, oil cooler,
> possibly
> cylinder heads, and pretty much anywhere else it can find its way
> out of.
> 5       If all this leakage was from blow-by, surely it would burn a
> lot of
> oil.  Does a leak-down test positively identify the source of the
> leak?  If
> the valves were not holding, could the air flow into the head and
> down the
> pushrod tubes into the case?  Something does not add up here.  I am
> going to
> carry out a normal compression test this evening and see if I can
> increase
> the results by putting engine oil in the spark plug holes.
>
> I do not have a particular problem with power or the running, but
> the oil
> leak is too excessive on long or uphill/headwind journeys.  Does
> anyone have
> any advice on my next move as at the moment it looks like an engine
> strip
> and rebuild!
>
> As always, any help is much appreciated!
> Regards
> Michael
> 81 Westy 'Daisy'
>
>

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