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Post by enginewhisperer on Feb 10, 2016 18:54:36 GMT -5
they don't produce much "suction" if the gears are dry, so you may have to prime the pump with some oil first.
I'm not sure which way the Subaru pump spins, but if you look at where the gears are in the pump, the oil is carried around the outside of the gears - not through the middle of the meshed teeth.
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willisdaye
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Joined: September 2015
Posts: 41 
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Post by willisdaye on Feb 10, 2016 21:19:56 GMT -5
Thanks. Couple questions. Can I prime the pump simply by using a funnel to pour oil into the drain intake? Will running the pulley the wrong way damage the pump? Will I have to prime the pump every time before using the engine?
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Post by madpatty on Feb 10, 2016 22:14:41 GMT -5
I had been using gear pumps for quite sometime now for lubrication...
Even a slightest of gravity feed will work for you...my oil tank was just like 1" above the pump level and no priming never needed at all....
I have never seen a pulley getting damaged by wrong rotation of the pump but surely in externally mounted pumps the seals get damaged if the pump works the wrong way pressurising the seal and damaging it.
Cheers.
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Post by enginewhisperer on Feb 10, 2016 23:10:41 GMT -5
I've often primed pumps by turning them backwards by hand while pouring oil into the outlet line, or by pre-filling the inlet and turning it.
Once the gears are "wet" they'll usually self prime ok.
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Post by smithy1 on Feb 11, 2016 17:51:44 GMT -5
Willisdaye,
You mention you're using a Subaru "Power Steering" pump, I'm not real sure but I think some P/S pumps are "Vane" type pumps...most of us are using the old Subaru pushrod engine oil gear pump which is bolted to the front of the engine and is driven by the camshaft. No matter, your P/S pump should work. Just do as Andrew mentions and you should get a result.
Cheers,
Smithy.
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willisdaye
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Joined: September 2015
Posts: 41
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Post by willisdaye on Feb 11, 2016 18:38:10 GMT -5
Yeah I tested it out with this advice, and I got it to go. It has some good pressure, the oil flew out of the manifold with some force and actually went a couple feet. Gravity feed won't be an option because there's very limited space on the carriage I'm mounting it on, and deadlines won't allow changing the frame. My plan is to pull out the drain pipe and prime the pump with a funnel if I need to before starting the engine. Does that sound like it'll work?
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Post by smithy1 on Feb 11, 2016 20:15:19 GMT -5
You shouldn't need gravity feed, once the pump has had oil in it...and as Andrew mentioned, it should just "prime" itself. My oil tank is a good 10" below the pump and it has no problem priming itself....just 2 seconds of running and it has full oil pressure, even after filling the filter, cooler, hoses and then the turbo itself.
Cheers,
Smithy.
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willisdaye
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Joined: September 2015
Posts: 41
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Post by willisdaye on Feb 11, 2016 20:50:22 GMT -5
Sounds good. Found an old drill that might act as a better motor for the pump, plus, no custom tooling required because there's a nut on the pulley shaft.
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Post by smithy1 on Feb 11, 2016 21:12:40 GMT -5
Just be careful, the drill may work, but how long will the battery last?? Last thing you need is no oil pressure when the turbo is doing maximum rpm...!
Some of us mere mortals tend to "over-engineer" everything. Using a margin of ~30% usually keeps us happy.
Smithy.
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willisdaye
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Posts: 41
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Post by willisdaye on Feb 11, 2016 21:18:53 GMT -5
Oh don't worry, its an old corded drill with a chuck, really old school.
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Post by smithy1 on Feb 11, 2016 21:47:16 GMT -5
Oh don't worry, its an old corded drill with a chuck, really old school. I keep forgetting it's mounted on a stationary unit...I keep thinking go-karts or bikes  You'll need quite a long extension lead then..  Smithy. |
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willisdaye
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Posts: 41
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Post by willisdaye on Feb 11, 2016 22:12:01 GMT -5
All in good time, all in good time.
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willisdaye
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Joined: September 2015
Posts: 41
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Post by willisdaye on Feb 18, 2016 14:34:43 GMT -5
Another question, is it bad for the turbo to have oil cycling through it when the engine is off and the shaft isn't spinning?
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Post by smithy1 on Feb 18, 2016 15:38:09 GMT -5
Another question, is it bad for the turbo to have oil cycling through it when the engine is off and the shaft isn't spinning? No...won't hurt it at all, you may get a tiny amount of leakage through the rings, but it'll be neglegible. Smithy. |
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willisdaye
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Posts: 41
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Post by willisdaye on Feb 18, 2016 22:58:03 GMT -5
Thanks. So I tried to start up the engine for the first time tonight, with no success. I'm using a shop vac on blow to spool the turbine. I don't think the propane ignited. I'm using a spark plug and grill ignitor to light the gas. If I change to a leaf blower do you think it would work?
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You'll need quite a long extension lead then.. 