Hi, I'm actually posting about my gf's 96 Nissan Sentra! This board is often my only source of correct info... Looks like I need to remove the old "oil pressure regulator valve" and install a new one. I think it is really an "oil filter bypass" valve, but Nissan calls it an OPRV. It is located on the block, or filter mount, under the filter. It is shaped like an empty bullet shell casing, with a spring inside, and a ball bearing pressed against the tip at one end. The ball bearing wore out the hole it was sealing, and the ball bearing went somewhere, so the valve is always open. So she's getting unfiltered oil going thru there all the time. She might be losing oil presuure too, but 2 Nissan dealers tell me they "don't know" whether this would affect the oil pressure! Her oil light started coming on a few weeks ago, when the engine is hot and idling. I don't know how long this valve has been broken. Just noticed it a while ago during an oil filter change. I want to get the old valve out completely, and not leave shards of it stuck in the block. It is pressfit into the block. About 1/8 inch of the tube (it's brass, I think) is sticking out of the block. I tried grabbing it with a pliers, to pull it out, and it just tore. What I plan to try next is to tap the protruding edge with a screwdriver, to get it away from the edge of the hole, and then poke a small screwdriver, or an awl in between the tube and the wall of the hole, and gently try to separate the brass tube from the wall, which I hope will loosen the tube up in it's tight fit, then grab as much of it as I can with a needlenose pliers, and give it a pull, and hope it all comes out at once without breaking apart. The hole goes straight back horizontally into the block so I could get any leftover crap out with a q-tip or something, I suppose. The Nissan dealer said they wanted $80 to replace it for me, and said it would involve drilling out the old valve ! I'm also wondering how I'm going to get the new valve in without mangling it. My plan right now is to grease it, then tap it in gently with a small wood block. I'd be tapping against the ball bearing at the tip, which is a raised circular surface which looks like it would dent easily. Any ideas welcome ! Thanks, GTA88

get a can or two of r134a and hose it down good, be careful not to touch it with bare skin. the can air held up side down woudl also work.

oh to cool it down and make the press fit easier? yea, that's good.
I was thinking a chunk of something, maybe aluminum rod, whatever, and drill a large hole in the end, about 3/4 the diameter of the ball. that way you're not tapping a round object with a flat object (it might slide off somewhere...)

careful you don't bend the new one getting it in, otherwise you'll be in the same place as you were before....