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  1. #11
    Join Date
    Jun 2004
    Location
    Guernsey
    Posts
    3,086

    Default Re: Help with diagnosis....loss of RPMs port engine

    My first thought is the one which is low on revs is doing all the work while the other one has a slipping bush, this happens a lot with the torque of the D6.

    If you lift the boat see if the gap between the duoprops on both sides has the same gap or if they have been touching.

    Other wise possibly turbocharger?

  2. #12
    Join Date
    Nov 2018
    Posts
    31

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by julians View Post
    This is a complete stab in the dark,but when other (and myself) have had similar issues it was due to the prop bushing having failed on the sidebof the engine that will reach max revs, IE your starboard engine.

    IE the engine with the failed bush is doing much less work because it's not actually spinning a prop, so will rev to max easily,leaving the other engine to do much more of the work, which it cannot do ,so it can't reach max revs.
    Winner, winner, chicken dinner!

    I know several others have pointed to the same problem. Turns out you guys are darn good! I posted on several sites and this one is the ONLY one that pointed to this as a possible problem. Awesome!

    And, that's exactly what the problem was. Turns out that one of the starboard-side propeller bushings on the duo prop was shot. I effectively only had one of the two propellers spinning on that side. That poor port engine was fine the entire time. It could never get to WOT RPMs as it was working to compensate and carry the load from the starboard side.

    Thanks again fellas! Best boating site hands down!

  3. #13
    Join Date
    Jun 2006
    Posts
    1,317

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by Advantage View Post
    Winner, winner, chicken dinner!

    I know several others have pointed to the same problem. Turns out you guys are darn good! I posted on several sites and this one is the ONLY one that pointed to this as a possible problem. Awesome!

    And, that's exactly what the problem was. Turns out that one of the starboard-side propeller bushings on the duo prop was shot. I effectively only had one of the two propellers spinning on that side. That poor port engine was fine the entire time. It could never get to WOT RPMs as it was working to compensate and carry the load from the starboard side.

    Thanks again fellas! Best boating site hands down!
    Good news, glad to have been of assistance.

  4. #14
    Join Date
    Nov 2018
    Posts
    31

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by julians View Post
    Good news, glad to have been of assistance.
    Virtual beers on me fellas!

  5. #15
    Join Date
    May 2015
    Posts
    347

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by Advantage View Post
    Winner, winner, chicken dinner!

    I know several others have pointed to the same problem. Turns out you guys are darn good! I posted on several sites and this one is the ONLY one that pointed to this as a possible problem. Awesome!
    Other forums? are there any?
    OK I know there are others but for the best advice this is the tops.

  6. #16
    Join Date
    Nov 2018
    Posts
    31

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by Croftie View Post
    Other forums? are there any?
    OK I know there are others but for the best advice this is the tops.
    Ha, ha! Seriously though....you make a solid case!

  7. #17
    Join Date
    Mar 2013
    Location
    boat conwy
    Posts
    3,930

    Default Re: Help with diagnosis....loss of RPMs port engine

    how did you find it

  8. #18
    Join Date
    Nov 2018
    Posts
    31

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by seastoke View Post
    how did you find it
    My boat sits in a covered slip during the summer. We finally pulled the boat out of the water for winterization and storage. It was pretty obvious with an inspection and turn of that one bad prop. Pretty simple fix.

  9. #19
    Join Date
    Jun 2001
    Location
    home Brum, boat Costa Brava
    Posts
    3,978

    Default Re: Help with diagnosis....loss of RPMs port engine

    Any chance of some pics?. I'd be really interested to see what a shot bush on a prop looks like.

  10. #20
    Join Date
    Nov 2018
    Posts
    31

    Default Re: Help with diagnosis....loss of RPMs port engine

    Quote Originally Posted by DavidJ View Post
    I'd be really interested to see what a shot bush on a prop looks like.
    I think you need to find another website for that?! Seriously, I didn't take any pictures but there was obvious slop in the propeller and rubber bits strewn about. The prop will need to be re-hubbed.

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