Re: [AMC-list] failed 195.6 OHV oil pump....

[Frank Swygert <farna@xxxxxxx>]

Stock for testing is good, but I'd put in a thicker gasket and test the modded system. I think the problem was not just that the gear was "riding down", but that the gear may expand more than you think. It would have to ride tight enough against the cover that no oil could get on the end to weld itself to the cover. With a little clearance sticking shouldn't be an issue. Maybe you can find a big enough chunk of flat cast iron, but I don't think there is enough difference between the iron and steel to cause an issue -- clearance is another story, and I don't know what those oil pump gears are made of. Probably a sintered metal?

DO NOT filter the oil before it goes to the head! Not unless you can run a filter with a bypass that you know for sure will work if the filter happens to clog. Dirty oil is much better than NO oil!!

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Date: Fri, 2 Jul 2010 14:28:56 -0700
From: tom jennings<tomj@xxxxxxx>

You read my mind -- in the last hour I put together a stock pump,
installed and tested it.

The results are interesting -- it's now 30psi cold idle instead of 60.
The stock pump's crazy clearances prevent it from pumping much.

I realized that it's so easy to swap pumps I might as well get some
schedule relief and make it stock, and worry about it later. This
weekend it has no filtration, but I'll get a stack of adapters so that
I can run ALL the top-end oil through the filter, that will be better
than stock and trivial.

It might be that the steel end plate is fine, and increasing
clearances to .010 - .015 will do it, but I'm not messing with this
now. I can re-make it from cast, etc. NOT NOW!

--
Frank Swygert
Publisher, "American Motors Cars"
Magazine (AMC)
For all AMC enthusiasts
http://www.amc-mag.com
(free download available!)

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