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Old 05-28-2015, 05:40 PM   #1
Ethan2.5i
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Member#: 409573
Join Date: Dec 2014
Location: Tacoma, WA
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2007 2.5i

Default Oil pumps and fitment

What's up guys? I've read that all oil pumps to do with ej25s will fit all ej25s but I'm just making sure that is the case before I buy an oil pump and it doesn't fit. So if I'm wrong please correct me and tell me what oil pumps I can use. The car is an 07 2.5i. Thanks for any help everyone.

Ethan
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Old 05-28-2015, 06:04 PM   #2
Zefy
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Chapter/Region: VIC
Location: Coquitlam, BC, Canada
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1979 BRAT / 01 RSTI
99 2.5TS (DEAD)

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yes all the oil pumps are interchangeable. whether or not it is the correct flow and pressure is another issue.

they also don't typically wear out... they leak which just requires a reseal.

But ya, just order one through subaru genuine parts website and give them your VIN. they will make sure you get the correct pump for your car.
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Old 05-28-2015, 08:45 PM   #3
Ethan2.5i
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Quote:
Originally Posted by Zefy View Post
yes all the oil pumps are interchangeable. whether or not it is the correct flow and pressure is another issue.

they also don't typically wear out... they leak which just requires a reseal.

But ya, just order one through subaru genuine parts website and give them your VIN. they will make sure you get the correct pump for your car.
Yeah the one I've got now is leaking, but it's also got metal in it from when the engine blew up. Lol. Thank you though! I'll definitely be checking that website out!
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Old 05-29-2015, 12:08 AM   #4
CosmoTheCat
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You may not need one, but if you're not short on cash it's not a bad idea to replace it if a bunch of metal went through it.

Don't forget to get a new crank seal and the o-ring behind the oil pump. If you take yours off, pull the cover off the back and see if there's any scoring. If not, put it back together and save some dough.

Also pull the piston pin plugs and throw some sealant on them while you're in there. If the motor is still out of the car, seal up the back end too.
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Old 05-29-2015, 05:10 AM   #5
subi400
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Quote:
Originally Posted by Ethan2.5i View Post
What's up guys? I've read that all oil pumps to do with ej25s will fit all ej25s but I'm just making sure that is the case before I buy an oil pump and it doesn't fit. So if I'm wrong please correct me and tell me what oil pumps I can use. The car is an 07 2.5i. Thanks for any help everyone.

Ethan
Ok,

Here's some tid bits to think about. The 99-2005 impreza either came with a 10mm rotored or a 7mm rotored oil pump. Not sure why but subaru is like that... lol Starting in 2006, due to the variable valve system on the intake cams in the heads on your engine, it does take oil pressure to activate the mechanism. So I believe that a 10mm pump was used, but can not state 100%.

At this time, if you do need to replace your oil pump then get a 9mm rotored oil pump, but add 2 additional shims or the small washers that you can buy through subaru to the bypass plunger. While this 9mm rotored oil pump will push about 1 gallon less oil at 5-6k rpm's can't remember the exact rpm (not that you would be going that high anyway) the trade off is that there will be less oil being bypassed which is good in a few specific ways. Now this depends on what size of pump that you have though in referring to the thickness of the rotor. There should be a # stamped on the top left outside part of the pump right next to the crank sensor mounting point. If your engine has a 10, then get a 9mm pump. If it has a 7mm though I doubt it, get the same size, but add 2 additional shims/washers to the bypass to bring the bypass spec up towards 85 or so.

I'll post the part # when my pc isn't freaking out
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Old 12-06-2015, 09:30 PM   #6
Stu_baru
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So what about a phase 1 2.2. Would it be worth it to swap to 10mm from a 9mm oil pump or should I shim up the bypass valve as well. Additionally anyone had any experience with ACL X series bearings(.001 larger oil ports)
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