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Date:         Sun, 15 Feb 2004 10:13:19 -0600
Reply-To:     John Rodgers <jh_rodgers@BELLSOUTH.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <jh_rodgers@BELLSOUTH.NET>
Subject:      Re: Head gasket question...
Comments: To: jesse johnson <jjmojo@BLAZENET.NET>
In-Reply-To:  <960212D4-5FBC-11D8-A684-000393799582@blazenet.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

It should be do-able. It may depend on the quality of the aluminum alloy in the head. Similar things are done in the aircraft industry.

On piston type aircraft engines, the cylinders are made as individual units, complete with cylinder head. The heads are not separate as on the WBX engines. The principle is the same -- steel cylinder barrel, aluminum head - but on the WBX he heads are separate. On this type cylinder, an aluminum head is screwed onto a steel barrel in such a way, and under such conditions, that the head and barrel are a permanent assembly. The aluminum head has valve rocker bosses machined into the aluminum head on top. There are four, and they are aligned two by two so as to accept individual rocker shafts. Cylinders used by the US military are often surplused out, in a used but serviceable condition. When they are released, the rocker bosses for the rocker shafts are deliberately broken off, usually just struck with a hammer. When the broken cylinders are delivered by a surplus purchaser to a certified engine repair facility, the shop will weld back in new material where the bosses are broken, then align and drill out the new boss material. Upon completion of the rest of the cylinder repair, the cylinder is inspected, then re-certified as airworthy.

The point in all this is....there is no reason that welding in new materials and re-machining cannot be accomplished. Might be pricey, however.

Regards,

John Rodgers 88 GL Driver

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