bumpy
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| posted on 11/4/21 at 07:56 AM |
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Worryingly high oil pressure on Pinto engine
Before being put into storage at the end of last Summer my car ran with normal oil pressures, generally about 50 psi when running hot.
For some unknown reason it now wants to run at 90 psi most of the time. Its like someone turned on a switch to just about double the pressure!!
I put in a new oil pump, two new filters, changed the oil from 20/50 to 10/30, tried two other oil gauges including a calibrated capillary gauge and
took the head off to ensure no blockages to all accessible oil galleries.
Looks like I now need the experts. Please help.
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cliftyhanger
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| posted on 11/4/21 at 08:11 AM |
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Pressure relief valve stuck shut?
(I have zero Pinto experience, but all engines have a oil PRV to moderate pressure)
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bumpy
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| posted on 11/4/21 at 09:08 AM |
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Thanks, but as far as I know the pressure relief valve is part of the pump assembly, which was replaced in its entirety. Difficult to believe that
both the existing and replacement pumps have the same issue 
Does anyone know at what pressure the release valve operates?
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rusty nuts
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| posted on 11/4/21 at 09:15 AM |
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It will be a stuck oil pressure relief valve , it's the only thing to control the oil pressure
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bumpy
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| posted on 11/4/21 at 10:07 AM |
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quote:
Originally posted by rusty nuts
It will be a stuck oil pressure relief valve , it's the only thing to control the oil pressure
Thanks, but as far as I know the pressure relief valve is part of the pump assembly, which was replaced in its entirety. Difficult to believe that
both the existing and replacement pumps have the same issue
Does anyone know at what pressure the release valve operates?
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jacko
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| posted on 11/4/21 at 10:23 AM |
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Just a guess is the pipe over the cam ok
I know you say the valve is new but that’s does not mean to say it’s ok
Did you swop the pump like for like not a high capacity
Graham
[Edited on 11/4/21 by jacko]
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Mr Whippy
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| posted on 11/4/21 at 12:56 PM |
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First thing to do is confirm the oil pressure by fitting a test gauge. Most garages will have one. More often than not its the gauge is incorrect. If
its an electronic gauge check the wiring and earthing.
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bumpy
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| posted on 11/4/21 at 01:14 PM |
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quote:
Originally posted by Mr Whippy
First thing to do is confirm the oil pressure by fitting a test gauge. Most garages will have one. More often than not its the gauge is incorrect. If
its an electronic gauge check the wiring and earthing.
You must have missed that that has already been done (first post) 
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bumpy
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| posted on 11/4/21 at 01:16 PM |
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quote:
Originally posted by jacko
Just a guess is the pipe over the cam ok
I know you say the valve is new but that’s does not mean to say it’s ok
Did you swop the pump like for like not a high capacity
Graham
[Edited on 11/4/21 by jacko]
Pump swapped like for like, but high pressure exactly replicated what was present on old pump.
And yes that spray bar was fully clear
Thanks
[Edited on 11/4/21 by bumpy]
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David Jenkins
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| posted on 11/4/21 at 02:34 PM |
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quote:
Originally posted by Mr Whippy
First thing to do is confirm the oil pressure by fitting a test gauge. Most garages will have one. More often than not its the gauge is incorrect. If
its an electronic gauge check the wiring and earthing.
That was my thought - it could be a faulty oil pressure gauge or sender. Can you scrounge one from somewhere, just to try it out? Doesn't have
to be anything grand, or calibrated, just a cheapo gauge to see whether it still shows an abnormally high pressure.
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bumpy
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| posted on 11/4/21 at 03:00 PM |
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quote:
Originally posted by David Jenkins
quote:
Originally posted by Mr Whippy
First thing to do is confirm the oil pressure by fitting a test gauge. Most garages will have one. More often than not its the gauge is incorrect. If
its an electronic gauge check the wiring and earthing.
That was my thought - it could be a faulty oil pressure gauge or sender. Can you scrounge one from somewhere, just to try it out? Doesn't have
to be anything grand, or calibrated, just a cheapo gauge to see whether it still shows an abnormally high pressure.
You must have missed that that has already been done (first post)
Still would like to know what pressure the release valve should operate at.
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jacko
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| posted on 11/4/21 at 04:10 PM |
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A standard oil pump works at 60psi at 6000 rpm a high pressure oil pump is 90psi
So I have just read on classic Ford forum
As a matter of interest where did you buy the new pump as I have just read burtons sell high pressure pumps
Graham
[Edited on 11/4/21 by jacko]
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David Jenkins
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| posted on 11/4/21 at 04:39 PM |
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quote:
Originally posted by bumpy
You must have missed that that has already been done (first post)
You don't expect me to read the WHOLE post, do you? 
Apologies... 
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bumpy
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| posted on 12/4/21 at 08:55 AM |
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quote:
Originally posted by jacko
A standard oil pump works at 60psi at 6000 rpm a high pressure oil pump is 90psi
So I have just read on classic Ford forum
As a matter of interest where did you buy the new pump as I have just read burtons sell high pressure pumps
Graham
[Edited on 11/4/21 by jacko]
It was indeed a Burtons pump OP1
https://www.burtonpower.com/std-oil-pump-sohc-ford-pinto-e
scort-cosworth-t25-op01.html
Still doesn't answer the question why a car that ran all last year at normal oil pressures should suddenly double its oil pressure when
re-started this Spring, when absolutely nothing had been changed ?????
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CosKev3
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| posted on 12/4/21 at 09:13 AM |
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quote:
Originally posted by bumpy
quote:
Originally posted by jacko
A standard oil pump works at 60psi at 6000 rpm a high pressure oil pump is 90psi
So I have just read on classic Ford forum
As a matter of interest where did you buy the new pump as I have just read burtons sell high pressure pumps
Graham
[Edited on 11/4/21 by jacko]
It was indeed a Burtons pump OP1
https://www.burtonpower.com/std-oil-pump-sohc-ford-pinto-e
scort-cosworth-t25-op01.html
Still doesn't answer the question why a car that ran all last year at normal oil pressures should suddenly double its oil pressure when
re-started this Spring, when absolutely nothing had been changed ?????
Could well be a HP pump supplied by mistake?
And the old pump had a stuck relief valve?
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CosKev3
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| posted on 12/4/21 at 09:15 AM |
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Have you stripped old pump and checked relief valve piston?
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jacko
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| posted on 12/4/21 at 04:31 PM |
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Looks like the only thing you can do is sump off and check the relief valve there is nothing else that I can think of to cause your problem
Unless some one can think of something else
Graham
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jacko
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| posted on 12/4/21 at 05:31 PM |
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Still doesn't answer the question why a car that ran all last year at normal oil pressures should suddenly double its oil pressure when
re-started this Spring, when absolutely nothing had been changed ?????
I think you may have answered your own question it must be a stuck valve
Of cause I could be wrong
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CosKev3
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| posted on 12/4/21 at 05:37 PM |
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quote:
Originally posted by jacko
Still doesn't answer the question why a car that ran all last year at normal oil pressures should suddenly double its oil pressure when
re-started this Spring, when absolutely nothing had been changed ?????
I think you may have answered your own question it must be a stuck valve
Of cause I could be wrong
It's the same with a brand new pump though?
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bumpy
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| posted on 13/4/21 at 07:51 AM |
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Old PRV was taken apart, and no sign whatsoever of it sticking
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jacko
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| posted on 13/4/21 at 08:13 AM |
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Well if you think it isn’t the valve I don’t know what it could be faulted oil gauge maybe but you say you checked that
Graham
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r1_pete
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| posted on 13/4/21 at 09:14 AM |
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Does the engine sound rattly as if its starving of oil? If so, something could be blocking the galleries close to the pump.
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adithorp
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| posted on 13/4/21 at 09:23 AM |
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Wasn't there some issue with Burtons oil pumps? Seem to remember something about the galleries not lining up properly that o read something
about a while ago. Probably on a ford forum..
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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jacko
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| posted on 13/4/21 at 02:40 PM |
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Did you put gasket past in-between the pump and pick up or pump to block ? If so it could have part blocked a gallery
[Edited on 13/4/21 by jacko]
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steve m
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| posted on 13/4/21 at 06:28 PM |
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@Bumpy
Can you repost EXCACTLY what has been changed on or in the engine since the oil pressure was around 50psi until now its 90psi
I have had similar problems on a xflow, when the Prv wouldnt open but was more around 70psi at tickover
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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