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Oil in the Spark Plug tubes

Discussion in 'Rotax Engine Topics' started by Boat~R~US, Oct 18, 2018.

  1. Boat~R~US

    Boat~R~US Active Member

    Messages:
    36
    Ratings:
    +9 / 0
    Boat Make:
    SeaDoo
    Year:
    2010
    Boat Model:
    Challenger
    Boat Length:
    19
    Hello All,

    So started to winterize the Rotax engines and when I removed the spark plugs on both engines prior to fogging the engines. What I found was a big surprise. Their was motor oil on top and bottom of the spark plugs, enough to cause drips of oil on the socket. These engines have 70 hour of use and it was the first time plugs were removed. (its a 2018 engines)

    So what could cause this to happen on both engines? Plugs also looked pretty covered in oil. No engine performance issues and no large amounts of smoke.

    Did Rotax have a set of bad seals ? Did they over torque or under torque? Like to throw this out to everyone and see if they ever heard of this issue... We are in a puzzle why this happened.

    Thank you
     
  2. JetTech72

    JetTech72 Jet Boat Addict

    Messages:
    188
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    +104 / 0
    Boat Make:
    SeaDoo
    Year:
    2012
    Boat Model:
    Challenger
    Boat Length:
    23
    I wouldn't be to worry, but looks like your valve cover maybe leaking.
    You can try to re-torque those 8 Torx screws.
    Go in a cross pattern starting from the middle & target about 7 lbf.ft.
     
  3. Cobra Jet Steering LLC

    Cobra Jet Steering LLC Jetboaters Admiral

    Messages:
    3,132
    Location:
    Florida
    Ratings:
    +2,860 / 67
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    Other
    Common occurrence when the valve cover gasket leaks , the oil collects in the plug recesses so try tightening the bolts or just replace the gasket
     
  4. Boat~R~US

    Boat~R~US Active Member

    Messages:
    36
    Ratings:
    +9 / 0
    Boat Make:
    SeaDoo
    Year:
    2010
    Boat Model:
    Challenger
    Boat Length:
    19
    Here is a follow up of what happened. Bad seals placed in both engines.... Check your plugs their might be more out there like this.
     

    Attached Files:

  5. At the Sand Bar Again

    At the Sand Bar Again Active Member

    Messages:
    28
    Location:
    Marblehead/Sandusky Bay, Ohio
    Ratings:
    +12 / 0
    Boat Make:
    Chaparral
    Year:
    2016
    Boat Model:
    VR
    Boat Length:
    22
    So, Boat-R-US, what are we looking at? I am sorry, but I don't know where those tubes in your photo come from. I too had oil all over the top of the plugs when I changed them last week. I haven't tried to retorque anything yet. I was checking this forum for additional information and saw this updated post. Thanks in advance.
     
  6. Boat~R~US

    Boat~R~US Active Member

    Messages:
    36
    Ratings:
    +9 / 0
    Boat Make:
    SeaDoo
    Year:
    2010
    Boat Model:
    Challenger
    Boat Length:
    19
    So these sit below your spark plug housing. What it does is prevents oil from pushing up past the spark plug.

    You can see nothing to do with torque or head gasket seal. The rings were bad because installer never noticed them or just installed anyway.

    It’s a simple fix to perform and I recommend to order the service manual if your doing it yourself or if under warranty have the dealer do it.

    Hope this helps
     
    • Informative Informative x 1

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