In this situation the valves would certainly be closed in any case: Remember
that the rockers are already off, since we're removing the head - if the
rockers are off, the valves are closed.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM]On Behalf
Of Dan Snow
Sent: Tuesday, August 28, 2001 5:39 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Separating heads from cylinders

Cool idea, just make sure BOTH valves are shut when you start a pumpin'. I
can just see myself think "hmmm, I've pumped in a quart of grease--I ought
to start feeling some resistance."  Then I look to see all of the grease on
the ground, or worse, in my plumbing that I was too lazy to take off.

Daniel Snow
PhD Student
UC Berkeley

'82 Vanagon Diesel
'78 Puch Maxi Luxe Moped
'72 Motobecane Mobylette Moped
'01 Xootr Scooter

>From: Coby Smolens <cobys5@HOME.COM>
>Reply-To: Coby Smolens <cobys5@HOME.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Separating heads from cylinders
>Date: Tue, 28 Aug 2001 16:21:38 -0700
>
>Right - the problem is that the heads will move away from the block with
>the
>cylinders as the crank pushes the pistons outward. Compressed air is
>unlikely to do the trick - the seal between pistons/rings/cylinder walls is
>not an airtight one in the first place. The rings only inhibit the movement
>of air past them, making it practically null in the nano-seconds of
>compression and power stroke. The amount of air loss with everything just
>sitting statically there is likely to be too great to do the job. And, if
>you could seal the parts up to an acceptable level of air-tightness, the
>pressure required to separate them might be unavailable, not to mention
>dangerous. HMMM - how 'bout grease? If a person were to make a zerk-fitted
>spark plug-threaded adapter with which to pump grease into the cylinder
>(both valves are of course closed anyway), the grease might be dense enough
>to do the job. The hydraulic pressure would be much greater than the 150
>psi
>max likely to be available from an air compressor, and the volume of flow
>would be small enough that if the parts "popped" apart, they wouldn't tend
>to move very far. Just a thought - I've never tried this, just made it up
>on
>the fly. Use at your own peril!
>
>Coby Smolens
>Valley Wagonworks
>VW Bus and Vanagon Specialists
>"Intimately acquainted with VW Vans since 1959"
>
>1535 SF Drake Blvd, San Anselmo, CA 94960
>415-457-5628
>
>
>-----Original Message-----
>From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM]On Behalf
>Of Ed Sato
>Sent: Monday, August 27, 2001 1:40 AM
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Separating heads from cylinders
>
>
>That would work with solid blocks. But the jugs on VWs need to be secured
>to the case somehow. You could also use compressed air if you have the
>cylinders somehow tied to the case. Aloha, Ed

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