Ok I looked around and did numerous searches and didn't find what I was lookin for so now I ask.... anyone have a link to a good oil pump seal thread? I just need to know if there is an special procedures once I have the pump off and am replacing the seal and "o" ring. Thanks in advance guys. Oh yeah its a 91 legacy 2.2 I believe, if you can tell me how to properly I.D my engine I would appreciate that to.

Here is a photo diy. http://beergarage.com/SubyOPump.aspx Some have said he used too much sealant on the oil pump.

 

If you look on your engine block just behind your alternator there is a mark in the engine casting that says either EJ22 or EJ25. You may need a flashlight to see it.

I don't think the 2.5L was available in 1991 so it's probably a 2.2L (or possibly a 1.8L or was that only in the Imprezas, well cars101.com would tell).

 

My biggest tip is to secure the o-ring to the pump before installation with a dab of something such as Edelbrock gasginch. I've done a few oil pumps and the biggest issue I had was the o-ring falling off the oil pump during installation. The first time, I wouldn't have even noticed except that I pulled the pump back slightly just to peek in there and the o-ring had slipped out and was stuck to the rtv.

 

Also on that year, the screws on the rear case cover over the rotors on the pump liked to back out. So make sure they're tight and maybe dab some loctite green or something around them too.

My biggest tip is to secure the o-ring to the pump before installation with a dab of something such as Edelbrock gasginch. I've done a few oil pumps and the biggest issue I had was the o-ring falling off the oil pump during installation. The first time, I wouldn't have even noticed except that I pulled the pump back slightly just to peek in there and the o-ring had slipped out and was stuck to the rtv.

 

I had the same problem with the O-Ring on mine. It was a pain to get it to stay in place but I finally got it. Also, after pounding in the seal I noticed the spring had come off of the inside of the seal... i didn't have any tools to get it back on so ended up pulling it out and putting a new one in. I had never done an oil pump before though and it really wasn't that bad.

I think I had the spring come out of one too but I don't remember. Usually when I'm doing the front crank seal I'm taking the oil pump off to reseal it anyway, so I install the new seal while the oil pump is off since it's easier. Then I coat the crank with grease while reinstalling the pump and am just real careful with the seal lip around the key.