Warm idle pressure of 50psi is just fine.
Even 20 is OK at idle if the motor has a fair few miles on it.
The oil light fitted to lesser Minis comes on at about 8psi!
It's a bit too late really if that comes on when driving along... 
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| oil pressure question https://www.ausmini.com/forums/viewtopic.php?f=2&t=84636 |
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| Author: | loveb [ Mon Feb 17, 2014 8:56 pm ] |
| Post subject: | oil pressure question |
Whats the normal oil pressure psi I should be getting? Just wondering as it usually sits 3/4 of the way. (70psi ?) most of the time as soon as I start the car the pressure will rise up to about 60-70psi. sometimes up to 90 I think when cold. However sometimes when I start it it sits at about 20 psi... Will rise up to 40 after some time and when I then drive off after a while it goes up to 60-70psi. is that a worry? I know theres a bit of air in the lines going to the gauge. just wondering if I should worry about it or let it be. drives fine otherwise. Apart form the usual not really wanting to go when cold lol |
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| Author: | 1071 S [ Mon Feb 17, 2014 9:09 pm ] |
| Post subject: | Re: oil pressure question |
Pull the oil pressure relief valve and give it a good clean. The air in the gauge line has no effect but random pressure changes are not normal. 75 psi (3/4 mark) is. Cheers, Ian |
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| Author: | drmini in aust [ Tue Feb 18, 2014 7:14 am ] |
| Post subject: | Re: oil pressure question |
Either the valve is sticking as Ian suggested, or it has been replaced with a 9/16" ball. When cold, the high pressure can force the spring to bend and deflect the ball off the seat, giving a scary drop in pressure. This can be remedied by using a new (straight) spring and fitting a piece of 5/16" dia x 40mm long steel rod inside it. These days I recommend using the standard valve & spring, not a ball. Less hassle.... |
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| Author: | BKozan [ Thu Feb 20, 2014 12:48 pm ] |
| Post subject: | Re: oil pressure question |
Ian, you say 75 psi is normal. When I start my mini it will sit around 75psi until it warms up, at which point it idles around 50psi, and drives around 70-75psi. Should I be concerned with a warm idle pressure of 50? |
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| Author: | drmini in aust [ Thu Feb 20, 2014 2:20 pm ] |
| Post subject: | Re: oil pressure question |
Warm idle pressure of 50psi is just fine. Even 20 is OK at idle if the motor has a fair few miles on it. The oil light fitted to lesser Minis comes on at about 8psi! It's a bit too late really if that comes on when driving along...
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| Author: | Wombat [ Thu Feb 20, 2014 5:16 pm ] |
| Post subject: | Re: oil pressure question |
Oil light coming on is to prompt you to look at your pressure gauge 
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| Author: | drmini in aust [ Thu Feb 20, 2014 6:49 pm ] |
| Post subject: | Re: oil pressure question |
Wombat wrote: Oil light coming on is to prompt you to look at your pressure gauge Um.. if you owned an 850 or a Mini Deluxe, the light was all ya got...  I always thought an oil LEVEL light would have been more useful for most A series owners. After all they do like to drink a bit of oilz. Back in the 60s BMC reckoned using 1 pint (~600mL) in 400 miles was `normal' for a 1098 during warranty period. |
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