I have noticed a similar plug on most of the u20 heads I've seen, but not all.
On some heads it is plugged, on some it has a line that connects to T joint
where
the oil pressure sender also hooks up. Is there any advantge one way or the
other? It would seem to send more oil to the head/ cam/ rockers or does it?
David srl701
Thomas Walter wrote:
> > J. Frank Spears wrote:
>
> >The shop has installed the new head on my 1600, however there is a hole
> >(about 1/8 inch diameter) in the head on the passenger side by #4 cylinder.
> >This hole is pumping out oil like no tomorrow. On the old head this hole was
> >plugged with a piece of brass.
>
> Drilled oil passage. The drilling is to allow for an internal passage,
> then is normally plugged after that step.
>
> >What is the hole for and what goes there if anything? Also if we need to
> >plug it, are there any suggestions on how to?
>
> Talk to your machinist. It should be refitted with a brass plug.
> Personally I like to drill and tap for a threaded plug to be installed,
> but no need to do that now that the head is on the car.
>
> Not the first time I have heard of "missing plugs" on the cylinder
> head. Sigh. Of humor, I once bought a Datsun 510, with a new carb.
> The old carb was in the trunk... in near perfect condition, but
> missing a plug about the size of a dime! Ya, car didn't seem to run
> with that big of an air leak in it.
>
> Cheers,
>
> Tom Walter
> Austin, TX.
>
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