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Thread: Oil Pump Spring?

  1. #1
    Senior Member Parzival's Avatar
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    Oil Pump Spring?

    Does anyone recommend replacing the spring in the oil pump when doing work that involves removing the oil pan.
    I have my oil pan off at the moment, and I cringe at the idea of missing the opportunity to make sure every system is operating at optimal performance.
    In the book it says to inspect the oil pump for wear by removing the cotter pin and inspecting the spring and other adjacent parts. The trouble is I dont see those parts being made available anywhere, The pump it self is so simple that thing will likely never wear out, but that spring may, and it directly effects the oil pressure produced.
    Thoughts?

  2. #2
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    there is no spring in the oil pump, nor a cotter pin.
    to remove it, its three bolts, AFTER you have removed the timing cover and the Pulley.

  3. #3
    Senior Member Parzival's Avatar
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    Quote Originally Posted by mark w View Post
    there is no spring in the oil pump, nor a cotter pin.
    to remove it, its three bolts, AFTER you have removed the timing cover and the Pulley.
    I believe you are mistaken.
    oil spring.jpg
    There is a spring and a few plugs in here, I think one is called "concave spring seat" or somthing like that, I didnt bring my workshop manual home with me.
    My pulley and timing cover are removed.
    Last edited by Parzival; 10-27-2019 at 10:53 PM.

  4. #4
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    That thing is pretty bulletproof so unless you suspect a problem I would leave it alone. The only problems I have heard of is when it gets touched. Did you remove the gasket for the crankcase yet?
    David Teitelbaum

  5. #5
    Senior Member Parzival's Avatar
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    I haven’t touched it at all yet, if I did I would leave Theo pump installed but pull that pin to inspect the spring. I was reading in a Volvo forum hat one guy noticed his spring was broken during his engine rebuild. I believe the function of that spring is similarly to the function of the PPR spring. It buffers the pressure and allows a relief in case of an over pressure.


    Sent from my iPhone using Tapatalk

  6. #6
    Senior Member
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    Correct, that spring functions as a pressure relief preventing the pump from over-pressurizing the system. It allows the excess oil to dump back into the crankcase. If it was broken it would cause the oil pressure to be lower than it should. It also functions as a bypass if the oil filter gets plugged up so you don't burst the spin on filter.
    David Teitelbaum

  7. #7
    Senior Member
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    Quote Originally Posted by Parzival View Post
    I believe you are mistaken.
    oil spring.jpg
    There is a spring and a few plugs in here, I think one is called "concave spring seat" or somthing like that, I didnt bring my workshop manual home with me.
    My pulley and timing cover are removed.
    AH, i see. I removed my pump, but didnt take it apart that far.

  8. #8
    Senior Member Parzival's Avatar
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    Quote Originally Posted by mark w View Post
    AH, i see. I removed my pump, but didnt take it apart that far.
    did you remove it just to inspect it? or did you replace it?

  9. #9
    EFI'd dn010's Avatar
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    The Volvo springs are shit. Two of the three pumps I took apart had broken springs. The spring in the D seems to be better made than those.
    -----Dan B.

  10. #10
    Senior Member Parzival's Avatar
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    Quote Originally Posted by dn010 View Post
    The Volvo springs are shit. Two of the three pumps I took apart had broken springs. The spring in the D seems to be better made than those.
    Really 2 out of 3!?
    Thats crazy, im gonna check mine for sure, even if the Delorean springs are better. If it is broken, where can I get a new one?

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