oil pump pressure release vlve

fintious maximus · Mar 9th, 2012, 20:01

Having broken own on Monday with oil light on the dash and seemingly too much oil in the engine,my mechanics first thought was that the oil pump had gone. Spoke to him today and he's read up that there is a pressure release valve that could have not reopened when oil was drained out. Any knowledgeable folks have any thoughts on this?

huron · Mar 9th, 2012, 21:54

I think what he means is; the pressure relief valve is part of the pump and if the spring has broken or something has jammed it open then the pump is just pumping oil back into the sump and not round the oil galleries.
If a wrong oilfilter without a bypass valve is fitted then a clogged oil filter will cause a similar effect as the oil will not flow through the filter and the pressure relief valve will open and return the oil to the sump.
Hope this throws some light on the fault.

fintious maximus · Mar 10th, 2012, 07:21

Sounds plausible. The oil filter was in bad state when it came out and there was about 1/2 litre too much oil in. Is it easy to release the pressure valve?

Jack Spaniel · Mar 10th, 2012, 08:09

There is also the oil pressure sensor that could have failed. This is screwed into the block on the front of the engine between the dipstick and started motor. It has a single electrical connector and sends a signal to the dashboard. Replacement is a simple screw out/ screw in operation.

fintious maximus · Mar 10th, 2012, 09:55

Quote:

Originally Posted by Jack Spaniel

There is also the oil pressure sensor that could have failed. This is screwed into the block on the front of the engine between the dipstick and started motor. It has a single electrical connector and sends a signal to the dashboard. Replacement is a simple screw out/ screw in operation.

would that cause loss of oil pressure? He's tried to hand crank the engine to test it and can't get any oil up....

Jack Spaniel · Mar 10th, 2012, 11:09

No, it would not cause LOSS of oil pressure, only stop any indication of loss.

fintious maximus · Mar 20th, 2012, 17:14

Pressure release valve broke! Managed to get an oil pump from breakers which was fitted today and just been called to say that my car is running and doesn't seem to have suffered any damage!

In the meantime i've had to buy a car to get my tools to work so now hve a Mondeo estate and V70. Now which one to keep.......... Mondeo is newer and 60k less on the clock. Do love me Volvo though

E54ahs · Mar 30th, 2023, 14:02

Anyone tell me were the pressure switch is please

Mar 9th, 2012, 20:01	#1
fintious maximus Senior Member Last Online: Jul 17th, 2016 10:19 Join Date: Feb 2011 Location: sheffield	oil pump pressure release vlve Having broken own on Monday with oil light on the dash and seemingly too much oil in the engine,my mechanics first thought was that the oil pump had gone. Spoke to him today and he's read up that there is a pressure release valve that could have not reopened when oil was drained out. Any knowledgeable folks have any thoughts on this? __________________ 2004 S40 1.8 in Met Cherry Red 1999 V70 T5 now sadly departed 1985 740, very much departed

Mar 9th, 2012, 21:54	#2
huron Master Member Last Online: Dec 19th, 2020 16:24 Join Date: Apr 2009 Location: Bodmin	I think what he means is; the pressure relief valve is part of the pump and if the spring has broken or something has jammed it open then the pump is just pumping oil back into the sump and not round the oil galleries. If a wrong oilfilter without a bypass valve is fitted then a clogged oil filter will cause a similar effect as the oil will not flow through the filter and the pressure relief valve will open and return the oil to the sump. Hope this throws some light on the fault. __________________ huron 2009 V70 2.4 geartronic in red.

Mar 10th, 2012, 07:21	#3
fintious maximus Senior Member Last Online: Jul 17th, 2016 10:19 Join Date: Feb 2011 Location: sheffield	Sounds plausible. The oil filter was in bad state when it came out and there was about 1/2 litre too much oil in. Is it easy to release the pressure valve? __________________ 2004 S40 1.8 in Met Cherry Red 1999 V70 T5 now sadly departed 1985 740, very much departed

Mar 10th, 2012, 08:09	#4
Jack Spaniel Senior Member Last Online: Jun 20th, 2017 19:13 Join Date: Jan 2011 Location: Portsmouth	There is also the oil pressure sensor that could have failed. This is screwed into the block on the front of the engine between the dipstick and started motor. It has a single electrical connector and sends a signal to the dashboard. Replacement is a simple screw out/ screw in operation. __________________ Previous Cars 1 x 1999 V70 2.0 10v 3 x 245 1 x 244

Mar 10th, 2012, 11:09	#6
Jack Spaniel Senior Member Last Online: Jun 20th, 2017 19:13 Join Date: Jan 2011 Location: Portsmouth	No, it would not cause LOSS of oil pressure, only stop any indication of loss. __________________ Previous Cars 1 x 1999 V70 2.0 10v 3 x 245 1 x 244

Mar 20th, 2012, 17:14	#7
fintious maximus Senior Member Last Online: Jul 17th, 2016 10:19 Join Date: Feb 2011 Location: sheffield	Pressure release valve broke! Managed to get an oil pump from breakers which was fitted today and just been called to say that my car is running and doesn't seem to have suffered any damage! In the meantime i've had to buy a car to get my tools to work so now hve a Mondeo estate and V70. Now which one to keep.......... Mondeo is newer and 60k less on the clock. Do love me Volvo though __________________ 2004 S40 1.8 in Met Cherry Red 1999 V70 T5 now sadly departed 1985 740, very much departed

Mar 30th, 2023, 14:02	#8
E54ahs Alex brown Last Online: Apr 18th, 2023 19:37 Join Date: Mar 2023 Location: dumbarton View Photos By: E54ahs	Anyone tell me were the pressure switch is please

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