Stage 1 overheated maybe bad fan clutch?

Discussion in 'Street/strip 400/430/455' started by green71stage1, Jul 14, 2019.

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  1. 1969RIVI

    1969RIVI Well-Known Member

    I got a brand new TA 1537BHP coming next week to put on maybe the water pump isn't able to keep up anymore? My Champion AE161 aluminum rad is a 2 row 1" tubes, 50/50 mix with 1 bottle water wetter also. Unless my gauge is out of whack I'll have everything in the cooling system replaced. As you know Larry you and I have went through my timing twice to make sure it's all good so that's ruled out.
     
    1969RIVI, Jul 21, 2019
    #21
  2. LARRY70GS

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

    With the engine idling, what is your actual ignition timing?With all the guys I talk to, I can't remember.:D
     
    LARRY70GS, Jul 21, 2019
    #22
  3. 1969RIVI

    1969RIVI Well-Known Member

    If I remember correctly I set it a 12° initial, the DUI distributor has 22° built into it and then what ever the vacuum adds to it once plugged in.
     
    1969RIVI, Jul 21, 2019
    #23
  4. LARRY70GS

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

    Then the timing should be 12 + the vacuum advance. So at idle, your timing should be 22* minimum. Check that.
     
    LARRY70GS, Jul 21, 2019
    #24
    Dadrider likes this.
  5. Brett Slater

    Brett Slater Super Moderator Staff Member

    Just did a side by side comparison of the (new) smooth edged RC29 cap I got from CARS a few weeks ago with the scalloped edged one I'd been using since last year.

    The spring on the new smooth edged one was almost fully open - and the car hadn't been run.

    I put the other one back on but didn't really get to drive it long enough for it to heat up. I'll know better later this week.
     
    Brett Slater, Jul 23, 2019
    #25
  6. green71stage1

    green71stage1 Well-Known Member

    Finally got a chance to check the car out some. I checked the fan clutch before and after I drove it and it spun the exact same way. It did not tighten up whatsoever after the engine was hot. That is probably why when I was stuck in traffic, it was overheating. There may be other issues and I will do some further checks. Does anyone know the GM part number for the fan clutch and where a good place to pick one up may be? Thanks for the help guys!
     
    green71stage1, Aug 18, 2019
    #26
  7. LARRY70GS

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

    Pick one of the thermal fan clutches,

    https://www.rockauto.com/en/catalog...79774,cooling+system,radiator+fan+clutch,6812
     
    LARRY70GS, Aug 18, 2019
    #27
  8. green71stage1

    green71stage1 Well-Known Member

    Thanks Larry. Standard or heavy duty?
     
    green71stage1, Aug 18, 2019
    #28
  9. LARRY70GS

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

    I have a standard four seasons thermal on mine.
     
    LARRY70GS, Aug 18, 2019
    #29
  10. green71stage1

    green71stage1 Well-Known Member

    Thanks
     
    green71stage1, Aug 18, 2019
    #30
  11. green71stage1

    green71stage1 Well-Known Member

    Just an update on the car. I replaced the clutch fan and no more overheating problems! I still plan on putting some gauges on it. After that problem was fixed the car was slow shifting out of first gear. After manually shifting it a few times and driving it awhile it started shifting normally.
     
    green71stage1, Nov 4, 2019
    #31
    Brett Slater likes this.
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