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Old 09-14-2021, 02:30 PM   #1
jayydubbb
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Default Priming brand new Oil Pump before installation

Currently rebuilding my motor completely and am ready to put a new 11mm oil pump on. It's basically a bone stock 07 STI motor with single AVCS. I have heard stories of people putting their pumps on then having to take them off again once the motor is in the car because they can't get oil pressure. I have also seen other people saying they just throw it on and everything works fine. Subaru also makes no mention in the fsm of needing to do anything to the pump prior to installation. Should I bother taking the plate off the back and packing it full of vaseline or oil or is it unnecessary?
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Old 09-14-2021, 02:36 PM   #2
pigboat_2
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No to 11mm pump and no to priming. Crank the engine in 5-10s intervals until the oil pressure light turns off.
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Old 09-14-2021, 02:45 PM   #3
jayydubbb
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Originally Posted by pigboat_2 View Post
No to 11mm pump and no to priming. Crank the engine in 5-10s intervals until the oil pressure light turns off.
Already bought the 11mm pump, realized later I probably should have just stuck with the 10mm but I can't imagine it's gonna be a problem.
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Old 09-14-2021, 05:12 PM   #4
Waddlz
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I hook up a manual oil pressure gauge to the rear oil galley plug, then crank until I see oil pressure build.

Then I start it up. I never prime anything
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Old 09-14-2021, 05:32 PM   #5
benflynn
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I had to pull oil filter and turn over till oil came out there, then put filter back on and it primed from there. I have started a half dozen at least with new pumps on a rebuild and never had to prime it before.
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Old 09-14-2021, 05:59 PM   #6
undyjr
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Although I have only installed one shortblock I followed Outfront's video and packed the oil pump with Redline assembly lube. I had it disassembled for cleaning anyways.

During the second cranking cycle I had oil coming out from the turbo oil drain. This was with the plugs out and a topped off battery. I would think liberal use of assembly lube would buy you plenty of time to build oil pressure.
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Old 09-14-2021, 10:00 PM   #7
JSR84
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If you’re smart you’ll put thread lock on the screws at the back of the pump, and while they’re off pull the cover and fill it with assembly lube or something similar. It’s a smart idea to prime the engine using a pressure pot or pump, I just used a drill pump to run a few litres through the engine prior to starting it.
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Old 09-15-2021, 10:32 AM   #8
jayydubbb
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Quote:
Originally Posted by JSR84 View Post
If you’re smart you’ll put thread lock on the screws at the back of the pump, and while they’re off pull the cover and fill it with assembly lube or something similar. It’s a smart idea to prime the engine using a pressure pot or pump, I just used a drill pump to run a few litres through the engine prior to starting it.
Is there no loctite on them from the factory?
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Old 09-15-2021, 11:34 AM   #9
JSR84
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Originally Posted by jayydubbb View Post
Is there no loctite on them from the factory?
Nope, they have a tendency to back out.
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Old 09-15-2021, 02:05 PM   #10
KillerBMotorsport
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My advice...

10mm pump (yes it's better on a SAVCS engine for a few reasons), Loctite RED the backplate bolts, but before doing that remove the backplate and insect the pump thoroughly for burrs and smooth action of the bypass valve. Rarely, but it does happen, but the bypass valve can stick open causing terrible things. Use assembly lube in the pump gears.

Priming if it's a new engine remove the plugs and crank with the throttle floored until oil comes out the filter pad. Install filter and start. OR, more commonly, just crank with it floored until the OEM oil light goes out, then start.

Once oil has made its way up the suction side and into the gears, the engine fills near instantly. Priming is really just getting oil into the pump. DON'T fill the filter with oil. Don't force oil into the OEM pressure port. Doing either of those does not 'prime'. In fact, it makes it harder for the pump to prime as it has to displace the oil to vacuum air up through the suction side. Any additional resistance to the pump moving the trapped air is only going to make it harder for the system to prime with oil.
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