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Leak down compression results.

Discussion in 'Early CJ5 and CJ6 Tech' started by DanStew, Oct 23, 2004.

  1. Oct 23, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    Sep 22, 2002
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    4,585
    Well i did the leak down test tonight.

    The previous results with the cylidners dry

    Driver Side - 145, 145, 128

    Passenger Side - 130, 124, 105


    Leak down compression results

    Driver Side - 155, 160, 190

    Passenger Side - 155, 145, 180

    Ok what does this mean now??

    Thanks!!
     
    DanStew, Oct 23, 2004
    #1
  2. Oct 23, 2004
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    It means you need rings.
     
    Glenn, Oct 23, 2004
    #2
  3. Oct 23, 2004
    gte636p

    gte636p Member

    smyrna, Ga
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    Sep 23, 2002
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    that rear passenger hole definately needs some rings...
     
    gte636p, Oct 23, 2004
    #3
  4. Oct 23, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    NOOOOOOO say it isnt so :(

    Guess i will run it as it is for a while, i still want to find out what the problem is for the misfire, guess it is ignition or timing chain, i will probably check those before i go into the motor. So does the pressure test indicate that i do not have a blown head gasket??
     
    DanStew, Oct 23, 2004
    #4
  5. Oct 23, 2004
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    The oil you put in there got down around the rings and basically sealed them. That tells you the rings are the reason for the low compression readings. Obviously you put enough to raise the compression ratio. :) How much did you put anyway?
     
    Glenn, Oct 23, 2004
    #5
  6. Oct 23, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    That i wasnt sure about. i put a funnel in the hole and dumped about ... say 4-5 tablespoons i would say. I didnt know for sure, i didnt fill the cylinder up by any means. i wondered if i added to much, i just added what i thought would be required to seal
     
    DanStew, Oct 23, 2004
    #6
  7. Oct 23, 2004
    Hill

    Hill Member

    Colorado
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    Mar 7, 2004
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    142
    I would say you are actually not that far off. You might have used a tad too much oil. Does it use oil, or smoke a bunch? If not, then next is to check the timing chain. They are famous for getiting loose on these engines. Also screws up timing.
    You can try a product I have had decent luck with.... RESTORE. Believe it or not, it works. It will help the rings re-seat a bit.
    Good luck! -Hill
     
    Hill, Oct 23, 2004
    #7
  8. Oct 24, 2004
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    Sep 20, 2002
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    Get a leakdown tester Dan.......
     
    blevisay, Oct 24, 2004
    #8
  9. Oct 24, 2004
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
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    blevisay, Oct 24, 2004
    #9
  10. Oct 24, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    It really doesnt seem to smoke that much. alot of it seems to be richness issues because it is black when it does smoke. and it seems to smoke after getting on it and then after it will smoke a bit and go away. And it seems to smoke bad after the jeep rolls over ;)

    I will go for the timing am guessing. Now i have to search for the posts on the timing chains.

    Thanks!!
     
    DanStew, Oct 24, 2004
    #10
  11. Oct 24, 2004
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I thought you had another engine to put in there. :?
     
    Glenn, Oct 24, 2004
    #11
  12. Oct 24, 2004
    Southtowns27

    Southtowns27 Custom Title

    The Backhills of...
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    You do need rings... The timing chain just might be compounding the problem. It sounds like you have a carb issue also. Seeing the compression come up that far after adding oil to the cylinders is definately showing a case of worn rings. The misfire could be coming from that cylinder with 105lbs of compression, it might not be firing regularly anymore. It probably isn't. I really don't see the timing chain doing much for you with the bottom end that weak. Put a timing light on it-Does the mark move all over the place or is it steady? If it jumps back and forth a lot, that's a sign of a stretched chain. But I doubt that would cause a misfire on only one side of the engine. When chains get sloppy enough to cause misfires, it's randomly all over the engine, not just one side. I'd look at rebuilding or replacing the carb too, especially if you're getting lots of black smoke. It could have a weak powervalve, leaky needle and seat, worn jets, etc etc.
     
    Southtowns27, Oct 24, 2004
    #12
  13. Oct 24, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    The carb is in great shape i havent dialed it in fully. the timing mark does move around for me alot. it has been doing that for a while, always frustrated me. i was thinknig quite possibly the cam maybe has warn lobes. But the motor actaully has good power to it, i have never lamented about power from it.

    Glenn i was going to get that 4.3 chevy V6, but that deal fell through :(
     
    DanStew, Oct 24, 2004
    #13
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