1. Welcome to Nitro & Tracker Owners! Join today, registration is easy!

    You can register using your Google, Facebook, or Twitter account, just click here.

1999 Merc 115 ELPTO 2+2 knocking!

Thread in 'Motors & Props' started by Jeff Sondak, Aug 26, 2014.

  1. Jeff Sondak

    Jeff Sondak Member

    Messages:
    10
    Likes Received:
    0
    Joined:
    Feb 2, 2013
    So any help would be greatly appreciated!
    Was out on the lake the other day, running across the channel at about 45mph with the engine at 4500-5000 rpms. All of a sudden the engine just dies! Thought I might have hit the safety lanyard and pulled the kill switch?! Started back up right away. Went further on the lake doing same speed and it again just dies! I have had this thing at 5200RPMs at 50+ with no issues in past.
    So I raised the engine checked prop, etc. Nothing seemed out of ordinary...I start I up again with no issues and same thing happens, not I start to worry get it to nearest marine, idling slow...we take off the cover and the oil res is fairly low. So I buy a quart of 2 stroke oil and drive it out of the marina, and notice the engine has a Knock to it, sounds like lifters in old cars...
    I went back to Marina but it was Monday and they had no service techs...called later, and they are saying could be blown power head, crankshaft, cylinders, etc... $$$ is all I hear.
    Any thoughts on what I could be or a way to diagnose? I changed the plugs, changed the oil and it still sounds like knocking coming from center to lower unit...
    Before bringing it to a shop figured I would ask.
    Thanks for the help!

    Jeff
     
  2. Jeff Sondak

    Jeff Sondak Member

    Messages:
    10
    Likes Received:
    0
    Joined:
    Feb 2, 2013
  3. Scott Hammer  TOXIC

    Scott Hammer TOXIC Well-Known Member

    Messages:
    12,301
    Likes Received:
    26
    Joined:
    Jul 16, 2002
    Location:
    Warrenton, VA
    Compression check each tube. You will have your answer.
     
  4. Jeff Sondak

    Jeff Sondak Member

    Messages:
    10
    Likes Received:
    0
    Joined:
    Feb 2, 2013
    So we did a compression test, got 137/137/135/135 top to bottom cylinders. Pulled lower unit to check...don't seem to be any issues there as well...
     
  5. AirForce

    AirForce Well-Known Member

    Messages:
    828
    Likes Received:
    49
    Joined:
    Apr 17, 2013
    Location:
    Smyrna TN
  6. Jeff Sondak

    Jeff Sondak Member

    Messages:
    10
    Likes Received:
    0
    Joined:
    Feb 2, 2013
    We did warm it up...took off and inspected lower unit and still nothing out of ordinary. I do know its a 2+2 and yeh its weird but the other 2 cylinders kick on around the 1900 or so RPM's...so still not sure what could be causing this. Afraid of the power head teardown.
     
Loading...

Share This Page