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225 Oil Smoke

Discussion in 'Early CJ5 and CJ6 Tech' started by EDDY ARNOLD, Apr 8, 2022.

  1. Apr 8, 2022
    EDDY ARNOLD

    EDDY ARNOLD Member

    71655
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    Apr 6, 2021
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    Have 71 cj5 starts oil smoke out right side 5-10 minutes after startups. None left side
    Unknown history of engine ran 6 months ago with headers didn't seem to smoke.
    Compression at that time around 150.
    Changed 2 stock exhaust and 2 used mufflers? Also rebuilt oil pump with hp spring oil pressure 40-60.
     
  2. Apr 8, 2022
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    cordele, Ga.
    Joined:
    Mar 29, 2007
    Messages:
    5,882
    Welcome to the forum. You will get lots of help from these guys. Some know 225's inside-out.(y)
     
  3. Apr 8, 2022
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
    Joined:
    Jul 30, 2003
    Messages:
    8,410
    Too many variables and unknowns to deal with..
    Worn valve guide(s) ?
    Worn/broken oil ring(s)?
    Plugged oil return hole in cylinder head on that bank ?
    PCV system operation okay?
    Spark plug color/deposits on effected bank of cylinders ?
    It's residual oil after shutdown that finds it's way into combustion chamber.
    Leakage test might help. Air introduced into the each cylinder at top dead center (TDC) to determine if
    leakage past valves or piston rings.
    Any recent oil change made ?
    Was multi-grade or synthetic oil introduced?
     
    OzFin likes this.
  4. Apr 8, 2022
    EDDY ARNOLD

    EDDY ARNOLD Member

    71655
    Joined:
    Apr 6, 2021
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    Unknown engine had good 150psi last fall with very little smoke. Run very little before winter. Not sure what oil po had run but had setup very long. Plugs didn't look bad.
    Cleaned carb, new gas tank, and plugs fired right up.
    Would think valve guides worn would smoke on startup. PCV valve appears to be operational.
    Just surprised only pass side and takes 5-10
    Minutes.
    I do have leak tester.
     
  5. Apr 8, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,244
    Sounds like the passenger bank may have some sticky oil control rings. Might soak them with some Marvel Mystery Oil or similar down the cylinders. Let them soak a couple days, turn over the engine without the plugs in and cover the spark plug holes with clean rags to keep from blowing fluid everywhere. This keeps the cylinders from hydro locking. Reinstall the spark plugs and run it down the road getting it fully warmed up if possible. This can help loosen the rings up. No guarantees but it can help or revive an engine that has been sitting.
     
    colojeepguy, Fireball and timsresort like this.
  6. Apr 11, 2022
    53A1

    53A1 Member

    Kern Co. Ca.
    Joined:
    Jun 17, 2008
    Messages:
    349
    After resurrecting my 225 I always have to ask if it recently sat for a long time. Sounds like it may have. Letting these engines sit for a long period of time is terrible for them.
     
  7. Apr 12, 2022
    EDDY ARNOLD

    EDDY ARNOLD Member

    71655
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    Smoking is almost gone my theory is used mufflers had residual oil...many thanks for the help
     
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