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? about waterpumps

Discussion in 'Intermediate CJ-5/6/7/8' started by CJjunk, Jul 14, 2008.

  1. Jul 14, 2008
    CJjunk

    CJjunk < Fulltime 4x4

    El Centro,CA
    Joined:
    Dec 26, 2005
    Messages:
    259
    A friend of mine is swapping a 4.0 from an '89 Cherokee into an '87 CJ7. In the process he said he installed the CJ WP onto the 4.0. It ran backwards but he said it bolted on. Is ther a 4.0 WP that runs the right direction for a non serpetine 258? I read somewhere the 2000 Cherokee had a high volume WP that would be for us desert guys. My cooling system is fine but I'm always looking out for possible upgrades.
     
    CJjunk, Jul 14, 2008
    #1
  2. Jul 14, 2008
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    A buddy of mine swapped a '94 ZJ 4.0 into his CJ7. I don't recall if he used the CJ water pump, or just the fan... but when the engine ran, it blew hot air from the engine compartment outward through the radiator :D

    To resolve the issue he ordered a special fan with blades designed to match the engine rotation and pull air into the engine bay through the rad.

    I think your buddy needs to be careful about running the WP in the opposite direction than stock for the '89 engine... it won't cool effectively, thermostat won't open, etc.
    Go with the original Cherokee WP, and get the fan with the reversed blades.
    (or go electric)
     
    Last edited: Jul 14, 2008
    lynn, Jul 14, 2008
    #2
  3. Jul 14, 2008
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,525
    serpentine = reverse rotation water pump and fan blades
    v-belt = standard rotation pump and fan blades
    if you change, you have to change both
    you simply ask for non-serpentine water pump
    intially, serepentine was first used on Calif models only, another way to check.
    if I recall, the word "reverse" is stamped into the water pump housing as well
    although I have seen pumps that weren't reverse with the word cast into the body.
     
    jpflat2a, Jul 14, 2008
    #3
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