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Old 03-20-2016, 10:01 PM   #7
spidertri
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Location: Elizabeth City, NC
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So not too much happened this week. I took my thermostat housing and oil pump inner rotor to my buddy's shop to have the housing machined flat and the achilles pump shaft pressed into the inner rotor.

I'm not usually an advocate of Uro brand parts, and we'll see what happens with this one, but I'd read that as long as the aluminum housing is sanded flat it will seal well. Well, I sanded and sanded and sanded, that sucker wasn't getting flat. Endmill got it flat, it took .006" off and then it was looking good.




While the oil pump was apart I replaced the relief spring and Oring. Side note, this is the same spring that's used for the timing chain tensioner on the M52. Old spring was about 2mm shorter than the new one.




New achilles oil pump shaft pressed into the inner rotor.




Reassembled the internals. Checked the tolerances on the end float (.003"), outer rotor to housing (.004"), and inner to outer rotors (.003"). Never found what the specs should be but those don't seem unreasonable from other oil pump rebuilds.




And the oil pump reassembled.

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98 328ti Morea Grun slicktop
11 128i space gray slicktop
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