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Oil Pressure Fluctuating


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#1 germini30

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Posted 21 March 2019 - 10:22 PM

Given the mini a little blast earlier, 998cc. Its got an oil pressure gauge and always has good oil pressure but I noticed that when I got home at idle the pressure was jumping back and forth from 40-50psi. If I revved it sat at 75psi. Any reason why it was jumping back and forth at idle???

#2 cal844

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Posted 22 March 2019 - 10:33 AM

Because the oil is hot, it will be ok as long as the pressure doesn't drop under 20psi

When was it last serviced?

Edited by cal844, 22 March 2019 - 10:34 AM.


#3 germini30

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Posted 22 March 2019 - 10:45 AM

It's just I never noticed it before but this was after a good blast. I restarted it later on and all good with no fluctuations. Maybe change oil and filter. Wasn't changed to long ago but I don't do much mileage

#4 mini13

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Posted 22 March 2019 - 10:54 AM

has it got a ball in the relif valve as they can do this.



#5 germini30

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Posted 22 March 2019 - 01:21 PM

Yes it does

#6 cal844

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Posted 22 March 2019 - 01:39 PM

There's the issue, change for a new thimble type oil pressure relief valve

#7 mini13

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Posted 22 March 2019 - 02:26 PM

Yep, the balls bobble round in the oil flow.

#8 Moke Spider

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Posted 22 March 2019 - 05:33 PM

http://www.theminifo...huttle-vs-ball/



#9 Dusky

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Posted 22 March 2019 - 08:43 PM

Sensors play up as well sometimes

#10 Mathilde

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Posted 06 April 2019 - 09:46 PM

I have a similar problem, when engine is cold, starting oelpressure goes up and when ideling engine warm it does not go down, or lower

always stays there with minimal movingI  changed the oelpressure gauge and the cable, still the same the gauge is a jaeger one from Italy

different reading not psi, but checked with a smith one. it goes to 7o and stayes there,  any suggestions I try to add a photo, but how. ??






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