joe11
Junior Member
Posts: 5 
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Post by joe11 on Oct 26, 2016 21:06:06 GMT
Peter Baldwin who some of you will know is a Mini Miglia racer and legendary rolling road operator based near Cambridge Essex, mentioned to me today that dismantling a mini oil pump from a manual engine can make it work less well afterwards, He suggested that most people do not mark up the innards so they go exactly in the same place when re-assembled, His experience was that lower idle oil pressure than before would often be the result, and if one polished some of the wear surfaces it can make matters worse, So it may be prudent if one is going to check the insides of a pump from say an auto engine, to some how mark it all up so the inner/outer impellers go back in the same place, same way round and don't be tempted to lightly polish any of the wear areas of any part of the pump.
Unfortunately a few days before he told me that's exactly what i did to a good looking pump in a tuned manual engine, the result i had afterwards was about 5Lb less oil pressure when hot and driving and about 5-7 Lb+ less pressure at idle when hot, I don't believe its the other work i did on the engine as I've had similar before when stripping engines for a semi repair/refresh when I've had the pumps apart as well.
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Post by limby2000 on Oct 26, 2016 21:16:07 GMT
Woops, bit late for me Joe, when i had my pump apart, checking and flowing out any rough radiuses. I assume your referring to the pump outer impellar as the inner is sided.
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joe11
Junior Member
Posts: 5
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Post by joe11 on Oct 26, 2016 21:26:49 GMT
The centre section moves round the outer impeller a bit like a planet in an internal orbit of another but if you take an auto pump totally apart, and take the centre shaft out of the inner impeller bit by taking off the circlips then it can be fitted back upside down as well, Its so easy to pull something out of a pump and then forget which way round you took it out once you have inspected it. that is if its not marked up some how which is top/bottom, if it goes back jumbled up then the matching wear will not be in the same place.
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Post by limby2000 on Oct 26, 2016 21:47:48 GMT
I did,nt split the centre shaft from the inner impeller, only the outer drum shaped impeller. Perhaps i got lucky,lol.
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Post by mra-minis on Feb 9, 2017 0:53:50 GMT
Peter Baldwin who some of you will know is a Mini Miglia racer and legendary rolling road operator based near Cambridge Essex, mentioned to me today that dismantling a mini oil pump from a manual engine can make it work less well afterwards, He suggested that most people do not mark up the innards so they go exactly in the same place when re-assembled, His experience was that lower idle oil pressure than before would often be the result, and if one polished some of the wear surfaces it can make matters worse, So it may be prudent if one is going to check the insides of a pump from say an auto engine, to some how mark it all up so the inner/outer impellers go back in the same place, same way round and don't be tempted to lightly polish any of the wear areas of any part of the pump. Unfortunately a few days before he told me that's exactly what i did to a good looking pump in a tuned manual engine, the result i had afterwards was about 5Lb less oil pressure when hot and driving and about 5-7 Lb+ less pressure at idle when hot, I don't believe its the other work i did on the engine as I've had similar before when stripping engines for a semi repair/refresh when I've had the pumps apart as well. What parts can be fitted wrong ? |
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