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unsticking an engine

Discussion in 'Early CJ5 and CJ6 Tech' started by all4jpn, Oct 11, 2010.

  1. Oct 14, 2010
    krkx93

    krkx93 Member

    louisiana
    Joined:
    May 16, 2010
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    81
    i just did this with a 360 today as a matter of fact. i pulled all the plugs and filled the cylinders with motor oil and let it sit for a day. turned over like a champ good luck
     
  2. Oct 15, 2010
    chuck123wapati

    chuck123wapati Member

    wyoming
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    Jun 18, 2008
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    761
    penetrating oil , nockerloose in the cylinders and valves they look just as bad then next day a piece of hard wood and a big hammer may take a couple f days f soakin
     
  3. Oct 15, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

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    I have done the air pressure trick as well with some penetrating oil, it will work but if you have a cylinder really stuck you are just farting in the wind. got 3 cylinders passing air by the rings in just a few minutes, left air on #4 for two days and it didnt even leak down:shock: hammer & block of wood got #4. never thought about hyd pressure though, a man might ben a rod with that kind of PSI :shock: but it wouldnt be stuck anymore:rofl:
     
  4. Oct 15, 2010
    Philip-TX

    Philip-TX Member

    Flower Mound, Tx
    Joined:
    Jul 25, 2010
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    156
    Keeping an eye on this thread......I may need it.

    I have the head bolts/etc out, and the head will not "gently lift off" per the FSM. :) I am not sure how much "persuasion" to give the head to get it to break loose. I have gently (about 5 on a BFH-force scale of 1-10) tried to drive a screwdriver, used a wooden block against "protrusions" such as the t-stat housing. I can get the PB to leak out around the gasket, which shows some progress.

    Any trick to get the stuck head off, so I can proceed to unstick the pistons?

    This morning I took out the plugs a get a generous shot of PB to start the piston soaking process.
     
  5. Oct 15, 2010
    Mike S

    Mike S Sponsor

    Cameron Park Ca.
    Joined:
    Oct 6, 2009
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    811
    The same air pressure trick will lift a head------put a couple of head bolts back in, but do not tighten the up, leave a turn or so free play----this will keep the head from attaining orbit when it breaks loose.
     
  6. Oct 15, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

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    me thinks he has not removed the head bolt under the carb;)
     
  7. Oct 15, 2010
    Philip-TX

    Philip-TX Member

    Flower Mound, Tx
    Joined:
    Jul 25, 2010
    Messages:
    156
    The under carb bolt, is out. along with EVERYTHING else (carb., rocker arm, fuel pump, oil line, dist., etc). I am working with a stripper down motor. FWIW
     
  8. Oct 15, 2010
    Bob Greenslade

    Bob Greenslade Member

    Roseville CA
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    Sep 15, 2008
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    232
    You need a bigger hammer.
     
  9. Oct 15, 2010
    all4jpn

    all4jpn Member

    fredericksburg,va
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    Dec 16, 2006
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    so today i put a block of wood on top of the pistons (one at a time) and hit it with a sledge...i broke the wood............................................................................................................................
    then i said screw it and put a huge thick socket on top of the pistons..hit with a sledge again and nothing......
     
  10. Oct 15, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

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    :iagree: if you got everything loose, and it sounds like you do
     
  11. Oct 16, 2010
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
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    Might be time to pull the whole thing and toss it.
     
  12. Oct 17, 2010
    chuck123wapati

    chuck123wapati Member

    wyoming
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    Jun 18, 2008
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    761
    you may have to pull the engine and remove th crank shaft to get the pistons out, if its that bad it may not be cost efective to try and repair it.
     
  13. Oct 17, 2010
    unclebill

    unclebill Banned

    a sun blasted...
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  14. Oct 17, 2010
    droff85

    droff85 New Member

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    Oct 16, 2010
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    I ran into a problem like this, thinking the pistons were hung up in a motor cycle engine. Started tearing the engine down and did everything you guys have mentioned to get it to move. Finally decided to bust the pistons thinking I could buy a set. Turned out they were not frozen, the crank and rods were. After I got the pistons demolished one rod would rotate and the other wouldn't. Took the rod loose but couldn't get the crank to rotate to take the other rod free. So your pistons may not be frozen, it may be deeper.
     
  15. Nov 27, 2010
    all4jpn

    all4jpn Member

    fredericksburg,va
    Joined:
    Dec 16, 2006
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    update....since family was down for the holiday...had my 18 year old brother in law help me..he hit one piston with a sledge while i did the same on another....and after a few hits,..it turns..still cant turn it by the crank nut, but by hitting the top of the piston..but the valves arent moving.........
     
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