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Oil Pump Inspection Testing
Is there a way to test oil pumps? Alternatively a recommended inspection procedure? We're doing a complete rebuild of our 914-6 engine (same as 1969 911T 2.0L as I understand it). We have the 3-rib magnesium oil pump that appears to be original. It turns freely with my fingers. It will get spirited street driving only, so I'm not feeling compelled to replace it if working as designed.
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02-14-2023, 04:46 AM
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gearhead
Join Date: Nov 2007
Location: Loverland, CO
Posts: 23,516
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As an alternative to replacing it, you could send it to Glenn Yee for rebuild and blueprinting.
https://www.glennyeemotorsports.com/gt1_oilpumps.html
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1974 914 Bumble Bee 2009 Outback XT 2008 Cayman S shop test Mule 1996 WRX V-limited 450/1000 |
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02-15-2023, 05:59 AM
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PCA Member since 1988
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There are some specs for the clearances between the gears and the housings, and between the gear teeth. I don't know what those specs are, but a search here may find them. I'll say this, make sure the pumps are within the specs, especially the scavenge side. Otherwise you will end up with the case filling with oil becuase the scavenge doesn't keep up with the pressure side. There's also a mod on early engine cases to allow the oil pressure valve to send excess oil back into the supply side of the system, instead of dumping it in the bottom of the case, where it has to be scavenged again.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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02-15-2023, 12:29 PM
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Registered
Join Date: Nov 2019
Location: Kansas City
Posts: 584
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Send it to Glenn Yee it’s maybe $800 but worth every penny
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it's not leaking....it's just marking it's territory |
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02-15-2023, 04:25 PM
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Banned
Join Date: Feb 2023
Posts: 5
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Yeah, you could send it to Glenn Yee
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02-16-2023, 01:17 AM
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Registered
Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,482
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Tear it down and check it out. Better safe than sorry.
Not a big deal to do, lots of threads on it. |
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02-16-2023, 12:16 PM
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| 911t 2.0 , 914-6 , oil pumps |
