I would think the small hole was there to oil the tensioner. To leave the
plug out would do nothing for the tensioner, and would result in a lack of
oil pressure to your upper end, the cam.
-----Original Message-----
From: Philip Erickson <philip.erickson@Agouron.COM>
To: Fred_Katz@ci.sf.ca.us <Fred_Katz@ci.sf.ca.us>; ROADSTER
<datsun-roadsters@autox.team.net>
Date: Wednesday, September 15, 1999 9:09 AM
Subject: Re: U20 head oil plug
>Fred,
>I didn't see any responses to your inquire, so a I think I will put in my 2
>cents.
>The 10 mm hole could produce a greater force ( Area x Pressure ) on the
body of
>the tensioner than the smaller hole in the plug if it is flush with the
head. I
>don't know if this would be a problem, but I would reinstall the plug.
>Happy Motoring.
>Phil
>
>Fred_Katz@ci.sf.ca.us wrote:
>
>> 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
>
>--
>Philip Erickson Phone: (858) 622-7963
>Associate Scientist
>Medicinal Chemistry
>Compound Management FAX: (858) 678-8277
>Agouron Pharmaceuticals, Inc.
>4215 Sorrento Valley Boulevard San Diego, CA 92121
>
>
>
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