OIL PRESSURE RELIEF VALVE. How is it fitted?
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Hi all,
Early pump with paper filter.
I know that sounds like a daft question, how is the relief valve fittted?
There is a hole in the side of the plunger, and I was wondering if it is critical that this be orientated in a particular direction in the pump body.
Just to clarify, I assume that as pressure exceeds the lift off pressure of the spring, the plunger is lifted off it's seat, and oil flows into the plunger, and out of the hole in the side of it, through the pump body and back down the return tube into the sump. This is the hole and plunger I am referring to.
Thanks in anticipation.
Early pump with paper filter.
I know that sounds like a daft question, how is the relief valve fittted?
There is a hole in the side of the plunger, and I was wondering if it is critical that this be orientated in a particular direction in the pump body.
Just to clarify, I assume that as pressure exceeds the lift off pressure of the spring, the plunger is lifted off it's seat, and oil flows into the plunger, and out of the hole in the side of it, through the pump body and back down the return tube into the sump. This is the hole and plunger I am referring to.
Thanks in anticipation.
- slpj
- New-tral
- Posts: 7
- Joined: 13 Aug 2017
That's how it works. The "knob" on the end of the plunger locates inside the spring. Similarly on the retainer the raised portion in the middle locates inside the spring. Give it a good clean and polish to remove any gum so it doesn't stick.
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2022 Ford Fiesta ST.
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2022 Ford Fiesta ST.
- 2cams70
- Coveted Fifth Gear
- Posts: 2050
- Joined: 10 Jun 2015
Hi there,
Thanks for replying and confirming how I thought it worked.
Can you also help me with how the plunger sits in the pump body, --- with respect to the hole on the side of the plunger? I didn't take enough notice of it's orientation when I took it out to clean it.
As in my white arrowed picture here. -- When inserting the plunger it can be rotated to place the hole in the side of the plunger, in any position in the pump body. Should the plunger should be inserted, so that the hole will be obscured in the pump body? Or doesn't it matter?
Thanks.
Thanks for replying and confirming how I thought it worked.
Can you also help me with how the plunger sits in the pump body, --- with respect to the hole on the side of the plunger? I didn't take enough notice of it's orientation when I took it out to clean it.
As in my white arrowed picture here. -- When inserting the plunger it can be rotated to place the hole in the side of the plunger, in any position in the pump body. Should the plunger should be inserted, so that the hole will be obscured in the pump body? Or doesn't it matter?
Thanks.
- slpj
- New-tral
- Posts: 7
- Joined: 13 Aug 2017
As already mentioned by a previous poster where the hole is doesn't matter as the oil can still escape once the oil pressure - and therefore the plunger - overcomes the spring.
What is of more importance in your oil pump is whether the rotors are within spec in respect of their relationship to each other and also to the inside of the housing as this is what determines whether you have an oil pump that is physically capable of supplying suitable oil pressure or not.
If your pump isn't capable of producing the pressure then it's likely you should be considering fitting a replacement pump.
What is of more importance in your oil pump is whether the rotors are within spec in respect of their relationship to each other and also to the inside of the housing as this is what determines whether you have an oil pump that is physically capable of supplying suitable oil pressure or not.
If your pump isn't capable of producing the pressure then it's likely you should be considering fitting a replacement pump.
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promotor - Fourth Gear
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- Joined: 16 Mar 2012
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