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Best Answer spannerboy , 09 January 2019 - 01:18 PM

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jime17 imack cal844

Thanks for your help guys.And the photo was a great help!!!

 

I took out the oil pressure relief valve and it was scored so I got a replacement.

The oil pressure was a little less now 95 while running and about 55 at idle.

So then brought and fitted the new switch today in my lunch hour.

The light is now off, so it was the switch that failed.

 

Thanks again for the help.

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#1 spannerboy

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Posted 06 January 2019 - 07:30 PM

So the yellow light on trhe dash came on and didn't turn off.

Thats the oil light right?

The red light is the charging system?

 

So I run around and grab the dipstick and the oil is there looking pretty clean and exactly inbetween the hi and lo marks.

 

I have a seperate oil pressure gague and this gets pressure, so the oil must be moving around the engine ok?

Would there be such a thing as too much pressure?

 

The oil pump wouldn't just fail would it? It would wear out slowly over time wouldn't it? I suppose if it was worn out I wouldn't be getting any pressure on the other gague would I?

 

 

So what am I left with the switch and the bypass?

If the switch failed or became unplugged would the light remain on as a safety feature?

 

Where abouts is the oil bypass bolt and where abouts is the oil pressure switch on a 72 998 Clubman?

 

 

There is what appears to be a pressure switch just below the thermostat with one green wire coming off it, but that would be for the coolant temperature wouldn't it?

 

I have also noticed that most of the wires in the engine bay are green and I am thinking that somebody rewired it in their favourite colour.

 

 

 



#2 jime17

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Posted 06 January 2019 - 07:44 PM

Your gauge suggests there is pressure so that leaves the switch or wiring.

What is the readingnon the gauge? I think the normal switch switches at a fairly low pressure... maybe 7psi? Someone else will know here for sure.

Edit. Yes sender below thermostat is coolant temp. Oil is at cylinder 4 end. (Clutch end)

Edit 2... red charging cct. Yellow is oil pressure.

Edited by jime17, 07 January 2019 - 11:04 AM.


#3 imack

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Posted 06 January 2019 - 07:54 PM

Oil pressure switch here, you may also have a t piece here for the gauge as well

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#4 cal844

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Posted 06 January 2019 - 07:57 PM

What is the reading on the guage? Anything under 15psi and it might be too late to prevent damage.

Check that the oil pressure relief valve slides in its bore and there are no scores

#5 spannerboy

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Posted 07 January 2019 - 10:28 AM

So with the engine running the gague goes up to about a  hundred and with it idling it goes up to about 50 lbs of pressure.

 

There is a scuff on the pressure relief valve, would this be my problem?

 

When I unplug the warning light it just goes off, when I ground it out on the engine it turns on. So the wireing must be good?

 

 

So if the car has pressure is it still ok to use while I wait for the parts?



#6 spannerboy

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Posted 09 January 2019 - 01:18 PM   Best Answer

@

jime17 imack cal844

Thanks for your help guys.And the photo was a great help!!!

 

I took out the oil pressure relief valve and it was scored so I got a replacement.

The oil pressure was a little less now 95 while running and about 55 at idle.

So then brought and fitted the new switch today in my lunch hour.

The light is now off, so it was the switch that failed.

 

Thanks again for the help.



#7 mini13

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Posted 09 January 2019 - 07:29 PM

95 psi is way high!

#8 spannerboy

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Posted 10 January 2019 - 11:25 AM

95 psi is way high!

What should it be?



#9 Ethel

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Posted 10 January 2019 - 11:56 AM

60psi would be reasonable. 55 is very healthy for idling, so I might be a little suspect of the gauge.

 

The normal running pressure should be set by the pressure relief valve, so if it really is high that'd be where to look. It's not a problem in itself, but high pressure wastes power and can cause the oil temperature to be more than necessary.



#10 mini13

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Posted 10 January 2019 - 02:51 PM

as above, std oil relif valve is normall set to around 45-50psi, anything over about 25-30 at idle hot is fine,


Edited by mini13, 10 January 2019 - 02:52 PM.





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