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  • Engine: Oil filter base valves

    Hi, Please help.
    I have 1963 R2 Avanti. Filter Base has two valves. Right one (in picture) has soft spring and opens easily. Left one has strong spring and needs lot of pressure to open. Is this correct? If yes, what is the purpose of a stronger valve?
    Studebaker Avanti R2 1963. Gray. 4-speed.
    Las Vegas Driveaway.

  • #2
    Is this a full flow block?

    The stronger valve is probably the emergency release valve. In case the filter gets plugged, there will still be oil flow to the engine.
    RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.

    17A-S2 - 50 Commander convertible
    10G-C1 - 51 Champion starlight coupe
    10G-Q4 - 51 Champion business coupe
    4H-K5 - 53 Commander starliner hardtop
    5H-D5 - 54 Commander Conestoga wagon
    56B-D4 - 56 Commander station wagon
    60V-L6 - 60 Lark convertible

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    • #3
      As long as we're on this subject, has anyone ever found a replacement for the valves and springs?

      jack vines
      PackardV8

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      • #4
        Originally posted by RadioRoy View Post
        Is this a full flow block?

        The stronger valve is probably the emergency release valve. In case the filter gets plugged, there will still be oil flow to the engine.
        Thank you RadioRoy, You wrote a very understandable explanation.

        Studebaker Avanti R2 1963. Gray. 4-speed.
        Las Vegas Driveaway.

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        • #5
          The valve with the strong spring is a relief valve that passes oil directly back to the pan through a 1/2" passage, above sixty pounds.
          The weaker sprung valve is supposed to bypass the filter at six pounds difference between in and out, indicating a clogged filter. It would be interesting to know exactly when else it does this. What if the oil is cold, or the engine is revved suddenly?
          Both valves in the adaptor may be redundant. The oil pressure control valve at the front of the block acts as a relief valve, although the valve in the adaptor is more effective, (hard to beat a 1/2" hole directly back to the pan for relieving oil pressure), Usually, filter elements themselves incorporate a bypass valve, but it may dump crap otherwise trapped in the filter.
          I used to have an old Fram catalog that listed the various valves in their filters and other interesting info.
          For instance, the large Ford filter has an anti drain back valve and a bypass valve. The HP 1 has neither, and is the same thread and size.
          Mike
          Last edited by Mike; 10-23-2021, 03:23 AM.

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