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  1. #1
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    msx 140 cyl head-black residue

    I am getting a black greasy residue on the outside top of the mag cylinder head, it appears to combustion products coming from the injector. Is this the injector seal leaking? How hard to change?


    smoke,


  2. #2
    ph2ocraft's Avatar
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    Can you tell us where the leak is on the photo?

  3. #3
    www.springbreak-florida.com rgard32's Avatar
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    Try tightening up the 2 bolts on top of the injector... It worked on a friend of mines boat..... and then keep an eye on it.....I think they try and come loose over time from vibration...since there so long..

  4. #4
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    I will take some pictures, Yes I tried tightening the 2 bolts.

    smoke,
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  5. #5
    ph2ocraft's Avatar
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    Remove the injector and re-seal. Torque to 18 foot pounds (tighten them evenly) and while you're there torque head bolts to 20 foot pounds (use a star pattern.
    Be sure to keep the injectors on their original heads as they are calibrated for that cylinder.
    Last edited by ph2ocraft; 10-28-2007 at 12:22 AM.

  6. #6
    cordespc's Avatar
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    The past couple days I am having the same oil leaking from the base of the injectors. I clean the skis after each ride, so this is definitely a new occurrence. Has anyone found a definite solution to these leaks? Also, if I remove the injectors to clean and reseal, are there any gotchas to be aware of?

    Thanks,
    PC

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Combustion residue (blackish) around the base of the fuel injectors - is that what you are seeing? Around all the fuel injectors or just one?

    What model and year is your machine?

  8. #8
    cordespc's Avatar
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    Its an 04 MSX140, and the condition I am seeing is just like Smoke's pics from years ago. My 03 MSX140 does not have this issue. Both have ~125 hours.

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by cordespc View Post
    Its an 04 MSX140, and the condition I am seeing is just like Smoke's pics from years ago. My 03 MSX140 does not have this issue. Both have ~125 hours.
    The actual 'seal' is straight metal to metal contact between the cylinder head and the injector tip.

    Remove the injector bolts evenly, wiggle the bracket up and off the injector, then clean the cylinder head opening and the outer surfaces of the injector tip. Do not use anything abrasive, and do not drop any grit into the cylinder. No need to remove the tip from the injector. Just use some solvent on a clean cloth.

    Reinstall the injector. Make sure the fat rubber o-ring that sits under the top of the injector bracket (and on top of the injector body) is in place and not damaged. That o-ring is the 'spring' that actually presses the injector against the cylinder head.

    Be sure the injector tip portion is aligned with the hole in the cylinder head. Evenly tighten the injector bolts so the injector is 'well aligned'. I think the torque spec is 18 ft-lbs, but you might want to verify that.

  10. #10
    cordespc's Avatar
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    K447, I knew you'd have great advice.

    So I removed the injectors tonight and I'm a little concerned with what I found on the PTO cylinder. I attached a couple pics. Basically there is significant oxidation/corrosion on this injector. It was also the one that had the greatest amount of residue dribbling from it. I think I now recognize that residue to be a mix of fuel, oil and rust from the injector housing.

    The other cylinders were significantly cleaner. I believe the PTO cylinder has this corrosion due to previous leak in the exhaust that misted water on the injector. That problem is now fixed. I have cleaned as best I could and reinstalled. Thoughts?

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    Last edited by K447; 09-17-2012 at 10:25 PM.

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