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rebuilt engine-bent two push rods?

Discussion in 'Early CJ5 and CJ6 Tech' started by rossbos, Apr 17, 2010.

  1. Apr 17, 2010
    rossbos

    rossbos Member

    everett wa.
    Joined:
    Nov 10, 2002
    Messages:
    230
    Does anyone know why I would bend two pushrods after about 15 minutes of run time on a rebuilt 225 v6 engine. It has new lifters but I used the old pushrods. The valves aren't stuck and the lifters look fine. Could it be that I didn't pre-oil the lifters before I installed them. I'm getting ready to put it back togethetr and don't want to run into the same problem again.
     
    rossbos, Apr 17, 2010
    #1
  2. Apr 17, 2010
    Todd1973

    Todd1973 Jeep Resurrect er

    Lima,Ohio
    Joined:
    Mar 9, 2010
    Messages:
    124
    Always lube parts before installation.

    Did you put the push rods back in exactly as they came out????



    Todd
     
    Todd1973, Apr 17, 2010
    #2
  3. Apr 17, 2010
    wheelie

    wheelie beeg dummy 2024 Sponsor 2023 Sponsor

    York, PA
    Joined:
    Mar 6, 2004
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    4,521
    Weak valve springs ???
     
    wheelie, Apr 17, 2010
    #3
  4. Apr 18, 2010
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Don't know what causes it, but I've seen it before. Let a good-running engine sit for a long time. When it's restarted, it bends pushrods, with no obvious cause. Possibly the lifters don't leak down like they should? Or somehow something gets into the cylinder and interferes between the valve and the piston?
     
    timgr, Apr 18, 2010
    #4
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