Hi,
We finally got the pickup back together on Friday night and made it to the National Rally yesterday. 198 mile round trip of A roads in the heat. The new springs and poly bushes completely transformed the drive.
We had a recurring problem with the oil pressure light flickering every time we stopped at idle. A few rpm more and it goes out. The wiring and connection are all good. 11 months ago we had the same problem and a new switch fixed it. I really don’t want to be replacing oil switches every year or 1000 miles.
Has anyone fitted a 20psi switch like this from Peter May Engineering?
https://www.petermayengineering.com/pro ... ht-switch/
Or the Minispares adjustable 20 - 120psi version?
https://www.minispares.com/hps1-oil-swi ... -20-120psi
I checked the oil level when we got home and it hadn’t dropped at all. I couldn’t see any signs of leaks anywhere.
Oil pressure switch - again
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Oil pressure switch - again
1972 Morris Minor 1000 pickup
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geoberni
- Minor Legend
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Re: Oil pressure switch - again
Sounds like the pressure switch contacts...
I hate to mention it, but I was also at the Rally yesterday and noticed at least a couple of the Traders with collections of used original Oil Pressure and Brake Light switches.
With hindsight, I'm wondering if I should have brought one or two, 'just in case'.
I hate to mention it, but I was also at the Rally yesterday and noticed at least a couple of the Traders with collections of used original Oil Pressure and Brake Light switches.
With hindsight, I'm wondering if I should have brought one or two, 'just in case'.
Basil the 1955 series II
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myoldjalopy
- Minor Legend
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- Joined: Tue Jan 29, 2013 10:32 pm
- Location: Kernow
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Re: Oil pressure switch - again
OP may have just got unlucky with the switch replacement, I don't know. I fitted an OPS from ESM about three years ago and no problems with it so far.....I guess that's about 9,000 - 10,000 miles.
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oliver90owner
- Minor Legend
- Posts: 1820
- Joined: Thu May 12, 2016 6:33 am
- MMOC Member: No
Re: Oil pressure switch - again
OP says: A few rpm more and it goes out.
Fitting a higher pressure warning light would not solve anything - if, indeed, the oil pressure is low.
How low is the tick-over? It may not be set quite high enough.
The oil pressure may be low, or adequate with a warning light wrongly indicating.
Does this occur with a cold engine? If not, the oil viscosity may be a contributing factor.
There may be leakage through the PRV, which would show up more with hot oil.
Changing the switch is a relatively cheap try, but what if the fault is still there? I would always fit an oil pressure gauge in parallel to the warning light (which, incidentally, we always used to refer to it as the idiot light - it tells you nothing until it is usually too late!).
Other possible faults could be oil pump or crankshaft bearing wear. Have these been considered?
Fitting a higher pressure warning light would not solve anything - if, indeed, the oil pressure is low.
How low is the tick-over? It may not be set quite high enough.
The oil pressure may be low, or adequate with a warning light wrongly indicating.
Does this occur with a cold engine? If not, the oil viscosity may be a contributing factor.
There may be leakage through the PRV, which would show up more with hot oil.
Changing the switch is a relatively cheap try, but what if the fault is still there? I would always fit an oil pressure gauge in parallel to the warning light (which, incidentally, we always used to refer to it as the idiot light - it tells you nothing until it is usually too late!).
Other possible faults could be oil pump or crankshaft bearing wear. Have these been considered?