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Discussion Starter · #1 ·
Looking for an alternative to using the paper gasket that goes between the oil pump and block. The gasket's bolt holes are a tad too small and the fluid hole is misaligned to the pump body. Flipping the gasket makes no difference. Attempts at cutting the gasket (I tried 3 different gaskets) with an X-Acto knife, and even using a punch to open up the bolt holes, have so far been unsuccessful--the gasket tends to separate as it's being cut.

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Does anyone have experience with these copper gaskets? Are they a better option?
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Ref: Copper Oil Pump Mounting Gasket 5 Pack Ford V8 289 302 | eBay

I also experimented with using Loctite 518 flange sealant, but noticed the sealant will slightly push out a bit towards the fluid hole. Although it's anaerobic and won't dry-up and harden like silicone would, I'm hesitant to use it in such an application for the fear of potentially clogging up an oil passage.

Thanks in advance.
 

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Discussion Starter · #3 · (Edited)
Oops, I was using the oil pump pickup gasket. I got confused between the two gaskets and realized I was using the wrong one, LOL. Anyway, just have to trim the edge on one side and it works perfectly.

This is the correct gasket...
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I think the last paper gasket I used was in 1984. Or was it 1985.....
I use silicon. In the case above bolt the pump in place lightly. Scribe around the outside of the mating surface. Keep the sil bead small & keep it as close as possible to the scribed lines, which ensures it is as far way as possible from the oil hole. Loctite 515/518 is probably ok, but I prefer sil.
 

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Discussion Starter · #10 ·
I'm still laughing about it because when the first one didn't fit I should have known better and stopped right there. I was test fitting the oil pump and pickup tube and without even thinking I grabbed the pickup gasket and attempted to use it on the oil pump.

At first I thought it was just a bad gasket, so I searched on Napa's website for "oil pump gasket" for a 1990 Ford Mustang 5.0. The results showed only one type of gasket available and in stock at a nearby store. So I thought, well that's it and picked up two. Going back now I see that I missed the word "Inlet" in the description.

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Silly me tries again to fit the same pickup gaskets until the flickering light bulb in my head finally lit up. I look in the oil pump box and what do I find sandwiched between the packing paper and documentation? :rolleyes:
 

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Neither gasket that comes with the pump fits perfect. There's pretty much always some trimming to do. I've had the best luck with a hole punch against a piece of brass/copper/aluminum, or some other softer metal. The copper gaskets linked above look interesting.

There's no such thing as a true bolt-on. Pretty much every part will need massaged one way or the other.
Good Luck
 
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