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Wheel Question

Discussion in '348/355' started by sgtpeper, Jun 19, 2020.

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  1. sgtpeper

    sgtpeper Formula Junior

    May 4, 2004
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    Jeff
    #1 sgtpeper, Jun 19, 2020
    When I was getting new tires yesterday, I found that 1 of my center caps is looking pretty bad and the other is clearly an aftermarket one. The 2 front wheels have parts 12 and 13 on them but the rears do not. Are these completely necessary? What do they do? It's like a rear cap?

    Also, what is 14 in this diagram?
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  2. Ferrarium

    Ferrarium F1 Veteran
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    Eric
    #2 Ferrarium, Jun 19, 2020
    14 is the large o-ring gasket that mates the wheel against the flange. its like 1/4" think and 5" diameter you cant miss it if you have it,
    I got the superseded wheel caps today, they just pop in nothing on the back side.
     
  3. sgtpeper

    sgtpeper Formula Junior

    May 4, 2004
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    Jeff
    #3 sgtpeper, Jun 19, 2020
    Is 14 necessary?
     
  4. MAD828

    MAD828 F1 Rookie

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    #4 MAD828, Jun 19, 2020
    It’s designed to keep water out from the mating face of the brake rotor and wheel mounting face. Due to the metallurgy of magnesium/alloy wheel and iron rotor mating adding water can create galvanic corrosion. I would run them.
     
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  5. sgtpeper

    sgtpeper Formula Junior

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    #5 sgtpeper, Jun 19, 2020
    It looks like it would push the wheels out a bit as well, no? Almost like a spacer? Or does it compress?
     
  6. MAD828

    MAD828 F1 Rookie

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    #6 MAD828, Jun 19, 2020
    It is not a spacer it is a rubber gasket.
     
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  7. sgtpeper

    sgtpeper Formula Junior

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    Jeff
    #7 sgtpeper, Jun 19, 2020
    Understood but you said it's about 1/4" thick so my thought is that it would still push the wheels out a bit when in place. Correct?
     
  8. PhilB

    PhilB Formula 3
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    #8 PhilB, Jun 19, 2020
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  9. sgtpeper

    sgtpeper Formula Junior

    May 4, 2004
    426
    Denver
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    Jeff
    #9 sgtpeper, Jun 19, 2020
    Ahhh got it. Fantastic. Is it common for them to be missing?

    Also, any need for the backing piece - (11 and 12 in the diagram)?
     
  10. PhilB

    PhilB Formula 3
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    #10 PhilB, Jun 19, 2020
    Last edited: Jun 19, 2020
    20+ years later I would imagine a fair amount of cars are missing these gaskets from their wheels, but that's just my assumption.

    #12 I think is another water seal set that is installed behind the wheel, I'm not certain and my car is at my remote garage so I can't check. I happened to have a spare #14 at home so I was able to grab those photos.
     
  11. sgtpeper

    sgtpeper Formula Junior

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    #11 sgtpeper, Jun 19, 2020
    Interestingly enough, the ring you are showing is part 8. On the backside there is a black plastic cap with a rubber gasket that goes onto the back of the wheel. Two out of my four wheels have this in place still. It clearly seems like it's unneeded?
     
  12. PhilB

    PhilB Formula 3
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    #12 PhilB, Jun 19, 2020
    Yup, I realized that after I posted originally and modd'ed my post hoping to not confuse anyone.

    I googled the part number for #12 and recall it, Maranello's site has good photos of it, I presume it keeps gunk/water out from behind the Cavallino cap. If it were me I'd source the 2 missing caps but it's not a priority to being able to drive and enjoy the car.

    These are the kind of parts that you really need to stay on top of the tech when having routine service done like new tires installed and make sure they go back on the wheel after mounting and balancing the new tire.
     
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