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Throttle shaft play...how much is too much?

Discussion in 'Rover P5 and P6 V8 Engine' started by Rob1, Oct 13, 2018.

  1. Rob1

    Rob1 Member

    As the title suggests. Butterfly shaft side to side movement is about half a millimetre, but the shaft can also move around in its housing by half to a third of a millimetre as well. I'm guessing this enough to cause a vacuum leak....?
  2. sdibbers

    sdibbers Well-Known Member

    Is this on an SU carb? If so that’s pretty bad. I’ve seen wear as little as 0.005” (0.125mm) cause problems with SU carbs. Difficulty in holding tune, rich idle and under par performance.
    PeterZRH likes this.
  3. Vern Klukas

    Vern Klukas Active Member

    Certainly sounds badly worn. The side to side is the more alarming, if the butterfly is firmly attached to the shaft there should be barely be any side shake.

    PeterZRH likes this.
  4. roverp480

    roverp480 Active Member

    Radial float on the shaft should be virtually nil, axial could be a small amount on full throttle, very little throttle closed
    Rob1 likes this.
  5. Rob1

    Rob1 Member

    Well, dang. Sounds like I've found a problem (yes, sorry on the SU carbs). Car has 35 000mi on the clock - I wonder if this is premature wear or if it's been 'round once already....

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