Printable Version | Subscribe | Add to Favourites
<<  1    2    3  >>
New Topic New Poll New Reply
Author: Subject: Worryingly high oil pressure on Pinto engine
bumpy

posted on 11/4/21 at 07:56 AM Reply With Quote
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.

View User's Profile View All Posts By User U2U Member
cliftyhanger

posted on 11/4/21 at 08:11 AM Reply With Quote
Pressure relief valve stuck shut?
(I have zero Pinto experience, but all engines have a oil PRV to moderate pressure)

View User's Profile View All Posts By User U2U Member
bumpy

posted on 11/4/21 at 09:08 AM Reply With Quote
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?

View User's Profile View All Posts By User U2U Member
rusty nuts

posted on 11/4/21 at 09:15 AM Reply With Quote
It will be a stuck oil pressure relief valve , it's the only thing to control the oil pressure
View User's Profile View All Posts By User U2U Member
bumpy

posted on 11/4/21 at 10:07 AM Reply With Quote
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?

View User's Profile View All Posts By User U2U Member
jacko

posted on 11/4/21 at 10:23 AM Reply With Quote
Just a guess is the pipe over the cam ok
I know you say the valve is new but thatís does not mean to say itís ok
Did you swop the pump like for like not a high capacity
Graham

[Edited on 11/4/21 by jacko]

View User's Profile View All Posts By User U2U Member
Mr Whippy

posted on 11/4/21 at 12:56 PM Reply With Quote
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.
View User's Profile Visit User's Homepage View All Posts By User U2U Member   Mr+Whippy 's Aim
bumpy

posted on 11/4/21 at 01:14 PM Reply With Quote
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)

View User's Profile View All Posts By User U2U Member
bumpy

posted on 11/4/21 at 01:16 PM Reply With Quote
quote:
Originally posted by jacko
Just a guess is the pipe over the cam ok
I know you say the valve is new but thatís does not mean to say itís 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]

View User's Profile View All Posts By User U2U Member
David Jenkins

posted on 11/4/21 at 02:34 PM Reply With Quote
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.





The older I get, the better I was...

View User's Profile Visit User's Homepage View All Posts By User U2U Member
bumpy

posted on 11/4/21 at 03:00 PM Reply With Quote
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.

View User's Profile View All Posts By User U2U Member
jacko

posted on 11/4/21 at 04:10 PM Reply With Quote
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]

View User's Profile View All Posts By User U2U Member
David Jenkins

posted on 11/4/21 at 04:39 PM Reply With Quote
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...





The older I get, the better I was...

View User's Profile Visit User's Homepage View All Posts By User U2U Member
bumpy

posted on 12/4/21 at 08:55 AM Reply With Quote
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 ?????

View User's Profile View All Posts By User U2U Member
CosKev3

posted on 12/4/21 at 09:13 AM Reply With Quote
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?

View User's Profile View All Posts By User U2U Member
CosKev3

posted on 12/4/21 at 09:15 AM Reply With Quote
Have you stripped old pump and checked relief valve piston?
View User's Profile View All Posts By User U2U Member
jacko

posted on 12/4/21 at 04:31 PM Reply With Quote
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

View User's Profile View All Posts By User U2U Member
jacko

posted on 12/4/21 at 05:31 PM Reply With Quote
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

View User's Profile View All Posts By User U2U Member
CosKev3

posted on 12/4/21 at 05:37 PM Reply With Quote
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?

View User's Profile View All Posts By User U2U Member
bumpy

posted on 13/4/21 at 07:51 AM Reply With Quote
Old PRV was taken apart, and no sign whatsoever of it sticking
View User's Profile View All Posts By User U2U Member
jacko

posted on 13/4/21 at 08:13 AM Reply With Quote
Well if you think it isnít the valve I donít know what it could be faulted oil gauge maybe but you say you checked that
Graham

View User's Profile View All Posts By User U2U Member
r1_pete

posted on 13/4/21 at 09:14 AM Reply With Quote
Does the engine sound rattly as if its starving of oil? If so, something could be blocking the galleries close to the pump.
View User's Profile E-Mail User View All Posts By User U2U Member
adithorp

posted on 13/4/21 at 09:23 AM Reply With Quote
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/

View User's Profile View All Posts By User U2U Member
jacko

posted on 13/4/21 at 02:40 PM Reply With Quote
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]

View User's Profile View All Posts By User U2U Member
steve m

posted on 13/4/21 at 06:28 PM Reply With Quote
@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




View User's Profile View All Posts By User U2U Member
<<  1    2    3  >>
New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.