The message I'm getting is that a number of late model U20 heads,
inadvertently got the oil plugs in the front galley. Hence the drilled
hole to allow the upper chain tensioner to work. Better off without the
oil plug.
Fred
______________________ Reply Separator __________________________
>Subject: U20 head oil plug
>Author: Fred_Katz@ci.sf.ca.us
>Date: 9/14/99 3:10 PM
>
>Does the front oil gallery plug on the U20 cylinder head serve any
>useful purpose?
>
>The machine shop pulled it out during the head rebuild. From what I
>recall, there was a 10mm plug in the oil gallery, with a small hole
>drilled in it. The plug sits behind the upper timing chain tensioner,
>and oils the tensioner through a small hole in the thin gasket, and
>into the tensioner. So it looks like the gasket and tensioner blocks
>the flow of oil anyway, and only allows a small amount of oil into the
>tensioner.
>
>I'm wondering if I should bother getting and putting an oil plug in,
>and might just mount the gasket and tensioner without it. Any problems
>doing this?
>
>Fred - So.SF
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