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Sorry that I wasn't able to find info on this even though I'm sure it has been asked and answerred before. I used the searchy thingy and only found one post regarding a new oil pump coming with two o-rings, but it didn't address where they both go.  Obviously the smaller one goes where the dip stick mates with the pump.  My Chilton manual only mentions that one.  I would appreciate some instruction on the second, larger one.  I'm rebuilding a 1.3l in an '88 Samurai.
Thank you.

maybe it goes on the tube for the water pump?

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The o-ring for the water tube is bigger.  In the gasket kits, including the oil pump box, from my machine shop there were four o-rings altogether.  I've installed the one for the oil pickup tube and id'ed the big one for the water tube and the small one for the dipstick.  That fourth one has me worried.  Its about 1" id, it would probably be good to measure it for sure.  I've read here-abouts about the two o-rings on the distributor and don't think those got replaced when we did the valve job last year, so I'll check into that.

Saw the post re: AutoZone on-line repair manual.  It reads a lot like my Chilton's, but I read it all the way through anyway looking for o-ring references.  No luck.  Keep trying...

DISTRIBUTOR

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Thanks guys.  Getting a post up helped me search harder and smarter.  I returned to my boxes of parts from my machine shop.  I found five o-rings, instead of four, all different sizes, and documentation on the boxes for all of them: Oil pick up tube, oil dipstick, water tube, and two on the distributor.  In the process I have become relatively certain that I can proceed with assembly and refer to my list to make sure each o-ring is in the right place.
I think I'm good for now.