Sheared Distributor Roll Pin

Discussion in 'Street/strip 400/430/455' started by Brett Slater, Apr 18, 2022.

  1. Brett Slater

    Brett Slater Super Moderator Staff Member

    I had to maintain some semblance of idle, otherwise the video is moot.

    Nonetheless, that's a cold start.
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Mine pretty much sits at 70 psi as I warm it up. At the track fully warm, it's close to if not 80 as I go through the traps, but the oil is at full temperature. Your video looks like it wants to go much higher when cold. Do you have an adjustable regulator?
     
  3. CJay

    CJay Supercar owner Staff Member

    So 80 psi snsps roll pins or doesn't snap roll pins? Or 80 psi cold will do it but not 80 psi hot?
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No, but it might be going higher than that cold. Hard to say from the video. There is a big difference between cold oil and hot oil as far as how much stress there is on parts.
     
  5. Brett Slater

    Brett Slater Super Moderator Staff Member

    I have whatever the TA cover came with.

    This is after driving for a while, at idle. Seems a bit high to me.

    20220423_145758.jpg
     
    dan zepnick likes this.
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Back the adjuster out. There may be too much preload on the relief valve. That won't affect the idle pressure, just limit the maximum pressure.

    To get the oil to the highest temperatures requires 15-20 minutes of highway driving.
     
    john.schaefer77 and Brett Slater like this.
  7. CJay

    CJay Supercar owner Staff Member

    I had to remove the 60 lb spring the ta pump comes with and install a 40 lber to get the pressure to where I wanted
     
  8. Brett Slater

    Brett Slater Super Moderator Staff Member

    I just read a thread about distributor gear issues and realized I never updated this one.

    Dan Zepnick was kind enough to send me a few larger (diameter) roll pins that required widening the hole in the shaft & gear to install.

    It worked like a charm and took quite a few good thrashings after my wheelhop issue was resolved.
     
    dan zepnick and Max Damage like this.
  9. STAGE2PAT

    STAGE2PAT Well-Known Member

    I had a 455 shear the distributor roll pin . I replaced it . Then it was putting out too much pressure and ballooned the oilfilter and pushed the element out and clogged the pick up . Thus starving the motor of oil .
     
  10. Waterboy

    Waterboy Mullet Mafia since 6/20

  11. 87GN_70GS

    87GN_70GS Well-Known Member

    Many years ago I sheared one on a really cold morning. I had a HV oil pump and it would sometimes hit 100 psi when cold out. This particular morning I had to jazz the throttle to keep it running bc the choke had been acting funny. Saw 100 on the gauge followed quickly by zero and silence. Unfortunately I did not have an adjustable regulator
     

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