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  1. #1

    Join Date
    Jul 2000
    Posts
    97
    Location
    Mid West
    Tractor
    Boomer 33D

    Default Blue Smoke - choking

    Have a 20 Year Old Ford 4600 SU and last year it began choking out and then discharging blue exhaust under higher RPM and under load. The dealer replaced the fuel pump and it seamed to help a little.

    The condition seems to be getting a little worse, so when I was replacing the fuel filter I noticed the injectors had never been changed. I replaced the injectors and the it still smokes badly.

    Could this be bad valves or seats? Could a person replace the valves and seats from the top - under the valve cover? Other sugestion??

    Thanks in advance!!

  2. #2

    Default Re: Blue Smoke - choking

    Marty

    I'M no expert but to me it sounds like very worn oil rings or even broken rings.

  3. #3

    Join Date
    Sep 2001
    Posts
    386
    Location
    hudson, NH
    Tractor
    kioti LK3054

    Default Re: Blue Smoke - choking

    yes, blue smoke usually means oil, so rings worn, broken or cracked. maybe vale seals but smoke due to seals usually clears up after intial puffs on starting. Do a compression check to find the offending cylinder.

  4. #4
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,521
    Location
    Nova Scotia, Canada

    Default Re: Blue Smoke - choking

    Does the crankcase oil level go down between oil changes?

    Egon

  5. #5

    Join Date
    Jul 2000
    Posts
    97
    Location
    Mid West
    Tractor
    Boomer 33D

    Default Re: Blue Smoke - choking

    I checked the tempature on each cylinder and they seam to be the same. The tractor does not use oil either and the breather seam to be fine. I did notice that it only starts to choke out at low ideal and at high RPM's.

    There is no unusual smoke during moderate RPM's. I have to believe it is fuel related and the injector pump seems to be a high suspect.

  6. #6
    Elite Member
    Join Date
    Mar 2002
    Posts
    3,390

    Default Re: Blue Smoke - choking

    Check for a plugged up muffler.

  7. #7

    Join Date
    Jul 2001
    Posts
    1,806
    Location
    Houston, TX.
    Tractor
    2001 TN65, 1951 8N Ford

    Default Re: Blue Smoke - choking

    Make sure your thermostat is working and your engine is warming up. I threw a load to my tractor a little too early today and it started cutting out and blowing blue smoke just as you described. I let it warm up a little longer and the problem went away.

  8. #8
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,220
    Location
    Eastern NY
    Tractor
    Case 885, JD 730D, Ford 4000

    Default Re: Blue Smoke - choking

    See the post above concerning old fuel and fuel conditioners. Engine operating temp is critical, they weren't designed to putz around with the coolant temp below 180.

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