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New upgrade, that possibly nobody ever wanted!

Discussion in 'Early CJ5 and CJ6 Tech' started by SFaulken, Feb 2, 2016.

  1. Apr 3, 2016
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,372
    Awesome, I'm glad it worked for you..:)
     
  2. Apr 30, 2016
    KBH

    KBH New Member

    Tucson, AZ
    Joined:
    Mar 21, 2016
    Messages:
    13
    I just installed this fan / clutch combo. It fit perfectly. I have a '66 CJ5 with a Dauntless. My issue is that it doesn't cool at all. I took it for a test drive and when I idled it in the driveway the temp spiked to 230 deg, and it's only 75 degrees outside. With the old fan it never got higher than 200, maybe 210. I didn't have a fan shroud on, but again the old fan didn't overheat even without the shroud. I went with a brand new clutch so I assume it's working. I'm at a loss for why it doesn't work. Here's a picture of the old fan & new one. Also, a picture of the installed fan. Lastly, my next experiment. The BFF. A 20 inch GM fan. BTW, I'm trying to get better cooling because I'm in Tucson. The old fan was marginal on 85 degree days. I'm trying to make sure I'm good on 110 degree days. Plus I'm putting in A/C so I need all the cooling I can get. Lastly, it does stay at 190 when driving at highway speeds. So I think my radiator is sufficient.
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  3. Apr 30, 2016
    SFaulken

    SFaulken Member

    Renton, WA
    Joined:
    May 24, 2011
    Messages:
    646
    No clue, I don't even have a shroud on mine, and even in stop and go seattle traffic, it never breaks 200, on a 195 degree thermostat. I can let it sit there and idle basically all day, and no issues.
     
  4. Apr 30, 2016
    Danefraz

    Danefraz Well-Known Member 2019 Sponsor

    Chico CA
    Joined:
    Aug 11, 2012
    Messages:
    1,976
    @KBH: how's your radiator condition? I took mine to the local shop for the dunk and fix... (or what ever they do to boil it).

    What temp thermostat do you have? I recall there being some choices, I think I put a 185 in mine and with the stock fan here in my area, when it was about 95 outside it'd idle fine.
     
  5. May 1, 2016
    KBH

    KBH New Member

    Tucson, AZ
    Joined:
    Mar 21, 2016
    Messages:
    13
    Sounds like a trip to the radiator shop is next. I have a 180 degree thermostat installed. The rad core seems to be clean inside but there are a lot of broken cooling fins. I'll also heat the clutch with a heat gun to ensure that it's engaging when hot. I think I'll also try the BFF just to see what it does, and what it sounds like.

    Thanks for the input.
     
  6. May 1, 2016
    KBH

    KBH New Member

    Tucson, AZ
    Joined:
    Mar 21, 2016
    Messages:
    13
    Update: I installed the BFF (20" GM fan, no clutch) and WOW!!! That baby moves some air. The temp stays right at 180 degrees all the time. It is a little loud and I feel that it's taking some power away, but it for sure stays cool!

    I also tested the fan clutch. I put a heat gun on the coil. The coil does contract and rotate the shaft as it should. However, I could feel no difference in the force it takes to rotate the fan. I thought when it got hot that it would not spin on the hub at all. Maybe my brand new clutch is bad...

    For now I'll run the BFF.
     
  7. May 1, 2016
    SFaulken

    SFaulken Member

    Renton, WA
    Joined:
    May 24, 2011
    Messages:
    646
    As I understand it, this fan clutch, being of a non "heavy duty" design never fully locks up. It runs at something like 30% of the water pump speed while the heat clutch is disengaged, and at something like 80% of the water pump speed when engaged.
     

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