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Startup Procedure For Newly Rebuilt 225?

Discussion in 'Early CJ5 and CJ6 Tech' started by Chuckman, Oct 12, 2019.

  1. Oct 12, 2019

    Chuckman New Member

    Jan 4, 2011
    is there a definitive procedure for the startup of a 225 after a fresh rebuild? bought this motor in a basket, and theres ZERO to start from. carb rebuilt, motor rebuilt, converted to HEI etc. so theres many variables to consider.

    break in oil etc.
  2. Oct 12, 2019

    cj6/442 Sponsor

    Fallbrook, Calif
    Feb 6, 2008
    I just broke in a freshly rebuilt 225 , I spun the oil pump first to build pressure and get oil to the top end , then installed the distributor. I filled it with delo 400 15w30.and used a zinc additive also .started it up I was close with the timing and once started I turn hei to get it to run clean and spun the motor a 2000rpm for 15 min , keep an eye on temp, pressure and water leaks .
  3. Oct 12, 2019

    wheelie beeg dummy 2019 Sponsor

    York, PA
    Mar 6, 2004
    I was always told to run straight water in the cooling system during initial start up of a fresh engine. Something about, if there is a coolant leak into the oiling system (like a head gasket problem?), the straight water is less likely than anti freeze, to lead to damage of the bearings. Might be hocus-pocus. Just what I was told. Maybe a pro can confirm or deny this info.
  4. Oct 13, 2019

    Twin2 not him 2020 Sponsor 2019 Sponsor

    Virginia Beach, VA
    Apr 28, 2011
    225 pack oil pump with petroleum jelly (vaseline)
  5. Oct 14, 2019

    53A1 Member

    Kern Co. Ca.
    Jun 17, 2008
    Good advise. Assuming you put in a new cam and lifters, Melling cams actually recommends Delo and I would take the above advice and add an additional bottle of Lucas with ZDDP. Drive it around for 20 min after cam break-in to break in the rings under load then dump the oil. I would stick with the Delo for the life of the vehicle but don't want to start another oil debate.
    Last edited: Oct 14, 2019

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