Im looking for an original or equivalent mercruiser 1991 502 oil cooler. Does any one know where I can order one of these?This is the type that sit on the bell housing and also cools the P/S.

Thanks Anthony

I've got a stock one. it hung on the side of the engine though(97 model) I'll take $50 s&h inc. I also have a fuel and P/S cooler.

I have a new one if that helps, give me a call or PM.
Bill 302-521-0123

what is the best way to pressure test one? what PSI max? i just installed a used 502 and it ran fine for a little bit, then it started to surge. shut it down checked oil and it was just begining to be milky white. i am really hoping it is the oil cooler before having to rip the whole engine out again and look for a new one.

Probably not the oil cooler .
Oil press is 30-80 PSI
Water is 2-20 PSI

It would be hard for the water to get in to the oil that way !!!
Better check your engine ,,not the cooler !!!!!!!!!