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Hot Rods Distributor skips gear on flathead

Discussion in 'The Hokey Ass Message Board' started by 1Slowjoe, Jul 20, 2020.

  1. 1Slowjoe
    Joined: May 28, 2020
    Posts: 5

    1Slowjoe

    IMG_2240.JPG IMG_2241.JPG Having trouble with timing on my ’52 mercy 233 flathead. Just got the motor rebuilt and the distributor seems to jump after about 15 seconds. Replaced the old one with a new Mallory. Checked for broken gears and nothing seems to be wrong there. Only thing I can see is that there’s no shoulder at the end of the cam shaft where it can enter the timing cover, is that an issue. Anybody, suggestions?
     
  2. alchemy
    Joined: Sep 27, 2002
    Posts: 15,851

    alchemy
    Member

    Some of the distributors made for the "supported" covers don't really have much body around the lower part of the shaft. They basically have the shaft hanging down there in the air. If that's what your distributor looks like, you should get a supported cover.
     
    Desoto291Hemi likes this.
  3. 1Slowjoe
    Joined: May 28, 2020
    Posts: 5

    1Slowjoe

    The shaft is supported. I shaved a bit off where the shaft end and the timing cover meet. That allowed it not to bind. Still wondering about that shoulder at the end of the cam/distributor gear. (top picture, middle).
     
  4. Mr48chev
    Joined: Dec 28, 2007
    Posts: 27,510

    Mr48chev
    ALLIANCE MEMBER

    A shoulder wouldn't keep it from popping off the gear or jumping off and on the gear.

    Have you checked to see if the distributor housing is slipping up in the cam cover as it runs?
     

  5. coilover
    Joined: Apr 19, 2007
    Posts: 616

    coilover
    Member
    from Texas

    Got to be something wrong with the housing I would think. I won't use the POS Loadamatic 8BA type dizzy but make external point adjusting Chevy distributors to replace them. With this set up the gear just hangs in the air but gives no trouble.

    Converted Chevy top weight with gear at very end and mounted in an 8BA

    IMG_4088.JPG IMG_4085.JPG
     
  6. Is the distributor gear meant to be down some more to center around the cover boss ? :confused: Dist.jpg
     
  7. 1Slowjoe
    Joined: May 28, 2020
    Posts: 5

    1Slowjoe

  8. 1Slowjoe
    Joined: May 28, 2020
    Posts: 5

    1Slowjoe

    It’s clamped down so I don’t think that’s the problem


    Sent from my iPhone using The H.A.M.B. mobile app
     
  9. 1320 Fan
    Joined: Jan 6, 2009
    Posts: 59

    1320 Fan
    Member

    First pic shows shallow tooth contact. Last pic looks like room to lower gear some with a shim to get closer to cam centerline. May help contact depth.
     
  10. 1Slowjoe
    Joined: May 28, 2020
    Posts: 5

    1Slowjoe

    I’m sorry how do yo mean shallow tooth contact?


    Sent from my iPhone using The H.A.M.B. mobile app
     
  11. Look at the witness mark on the cam drive gear,,,,,very close to the top .

    Tommy
     

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