Tom,
Thanks for the note. Now I'll remove the oil pump, and check that pressure
relief spring (something I didn't check, shame on me). Otherwise, I've got
the pump working real smooth, with a good sucking sound.
I've got the thin symetrical oil pump to engine block gasket, so no problem
there.
That pressure relief thing is a good feature, I guess dirty oil is better than
none at all. I noticed the oil filter mount has a pressure relief. On a whim, I
took apart the oil filter after noticing the filter pressure relief was crammed
with metal bits. The oil filter did it's job; it was full of metal bits, and
didn't pass any through the filter. But the pressure relief allowed the junk to
bypass the filter into the oil gallery. Fortunately, the P.O. shut down the
engine so the only damage was to the bottom end, and not the head. Most of the
metal junk was from rod bearings, and some from the lower timing chain guide.
Regarding the priming rod, hoped there was an off-the-shelf part that could do
the job, like maybe a part from a distributor.
I mic'd the measurements, and after a visit to a hardware store for the right
diameter rod then my grinder goes into action. I'm going to make a mounting
plate to fit where the distributor goes, so that'll keep the rod in place while
spinning it with the electric drill.
Fred - So.SF
_________________ Reply Separator_______________________
>Subject: Re: Oil pump in U20
>Author: walter@omni.sps.mot.com (Thomas Walter)
>Date: 8/16/99 6:02 PM
>
>Fred,
>
>The oil pump does have a SUPER THIN gasket on the
housing.
>
>You are correct about the pump itself. Usually you'll see
>the wear between the gears and the ALUMINUM bottom cover.
>Machining that cover flat, and a full inspection of the
>gears, is all that is needed. I still have a new pump that I
>have never installed.
>
>I would also pay attention to the pressure relief spring.
>There is a little piston in there, with the spring behind
>it. Pressure relief, but if the engine was full of metal bits
>(common when you loose a timing chain), the relief piston may
>get jammed in the OPEN position. If I find scoring, or problems..
>toss the pump, and just replace it. Cheap insurance.
>
>Pay close attention to that oil pump to engine block gasket.
>Early ones have an offset hole, installed the wrong way and you'll
>get NO oil flow. Later gaskets are symetrical, not a problem.
>
>You know about the oil pump priming rod. Good idea!
>
>Cheers,
>
Tom>
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