550 Oil pressure relief valve in Crankcase | FerrariChat
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550 Oil pressure relief valve in Crankcase

Discussion in 'Technical Q&A' started by hudykar, Oct 20, 2025 at 11:27 AM.

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  1. hudykar

    hudykar Rookie

    Jun 10, 2024
    5
    Poland
    Full Name:
    Oskar Hudyka
    #1 hudykar, Oct 20, 2025 at 11:27 AM
    Hi!
    Dose anybody ever removed oil pressure relief valve from crankcase in Ferrari 550? It’s under small cap on timing gears cover. I’ve marked it on photo.

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  2. Timmo

    Timmo Formula Junior

    Aug 26, 2017
    730
    Continental Europe
    #2 Timmo, Oct 21, 2025 at 1:32 AM
    The parts diagrams do not suggest there is anything behind this plug which seems to be just an access to one of the oil veins.

    The only pressure relief "valves" I can see are the two springs #18 & #37 in the oil pumps. Didn't you check these when you had the pumps apart?
     
  3. hudykar

    hudykar Rookie

    Jun 10, 2024
    5
    Poland
    Full Name:
    Oskar Hudyka
    #3 hudykar, Oct 21, 2025 at 2:01 AM
    I was suprised too. In crankcase diagram can see this and in plug hole I feel spring.
    Yea, I’ve checked both valves on oil pump and it looked fine.
    According to book oil pressure readings are too high (with aux gauge) and I’m searching for reasons.
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  4. Timmo

    Timmo Formula Junior

    Aug 26, 2017
    730
    Continental Europe
    #4 Timmo, Oct 21, 2025 at 2:52 AM
    Interesting. I was looking at the parts diagram of the 456M when posting earlier and comparing it with the other variants of that F133 engine used in the 456/550/575M/612 shows that the 456M is the only one that doesn't use this OPRV...

    What is the oil pressure shown on your mechanical gauge and is it different from the pressure shown on the dash with the original pressure sender in place? Do you plug your mechanical gauge in place of the oil pressure sender?
     

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