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MTU Series 60 Won't Rev Over 1500 RPM

Discussion in 'Ocean Yacht' started by alvareza, Aug 10, 2019.

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  1. Capt Ralph

    Capt Ralph Senior Member

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    Excellent work PB.
  2. alvareza

    alvareza Member

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    Now that’s a checklist! I will look at what I can and use it with when I can get the MTU tech down to the boat. Thank you
  3. Capt J

    Capt J Senior Member

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    I had a 2 year old pair of S60 825HP that one engine developed a leaking aftercooler (made by Garrett), boat was a 2006, they replaced both aftercoolers under warranty. Not sure if this could be a cause, hopefully not.
  4. Beau

    Beau Senior Member

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    I think we should all wait for the computer reading. It will tell us what sensor derated the engine, then we can suggest why?? just me
  5. alvareza

    alvareza Member

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    MTU tech is coming Monday
  6. Capt Ralph

    Capt Ralph Senior Member

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    Monday,, Monday,,
    Que old song music..
  7. alvareza

    alvareza Member

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    The issue seems to be the paper gasket between the charge air cooler and the intake manifold is leaking air. The lack of boost puts the engine into smoke mode restricting fuel.

    Interestingly the starboard engine has a small leak in the same place. It explains some soot I was wondering about near the front of the intake on that engine.

    Waiting on the quote and schedule to remove, clean the CAC and replace the the gaskets with metal ones now standard. Need to do both engines.

    Might have the valves checked at the same time.

    While there is room to work on both sides of the engine moving the large parts around won’t be easy. Planning to help the tech move the parts. There seem to be cutouts in the engine room ceiling. Wondering if anyone knows whether these are ‘cut here’ lines or screwed down access. The carpet is being replaced in the fall, never the same after we pulled it up to install the seakeeper, so not worried about that. Hope making access easier will save time/money on the repair.
  8. onyx

    onyx New Member

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    Sounds like it could be the TURBO BOOST SENSORS
  9. onyx

    onyx New Member

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    I had a similar issue last year and it was a the Turbo Boost Sensor. It was about $100 and can be replaced yourself. My Std engine would not go above 1300 rpm
  10. Capt Ralph

    Capt Ralph Senior Member

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    Have the techs check all MTU/S60 bulletins.
    I remember alternator mounts and exhaust manifold issues during the early S60/MTU marine conversions.
    The S60 is super solid. The marine hang on sh** (stuff) is where the issues are.
  11. Beau

    Beau Senior Member

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    What am I missing? Didn't the OP just tell us what the tech found....no more speculating?
  12. Capt Ralph

    Capt Ralph Senior Member

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    I was adding to, while the MTU techs were on board fixing the low air issue. S60 did have some teething issues.
    Gad I do love them.
  13. Capt J

    Capt J Senior Member

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    on ALL of the MTU's.....starters.....alternators......coolant pumps......etc.....etc....
  14. alvareza

    alvareza Member

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    I will have them check bulletins. It was comforting that was a likely cause on PacBlue’s list.

    Interesting you mention starters.... Heard the Stbd starter grind when starting. I don’t normally have the engine hatch open when starting. Installing a reman starter while access is easy with the CAC box out.
  15. rtrafford

    rtrafford Senior Member

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    Now trying to find and remedy the Tech.
  16. Capt Ralph

    Capt Ralph Senior Member

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    Please fill us in (in another thread) about your SeaKeeper upgrade, or did I miss it.
  17. Capt Ralph

    Capt Ralph Senior Member

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    Send in lots of pics on your CAC work here.
    We like to watch and learn.
    Work area under your decks. Pints of blood spilled. Short cuts for the next service (steel gaskets are a great example).
    You will be the hard knock master next time this comes up with less post..;);)
  18. alvareza

    alvareza Member

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    Boat is running well now. Both engines turning up just below 2350 rpm at 98-99% load with nearly full fuel, full water, all our stuff and a lot of tools. It was an eye opener to see the size wrenches the tech used. What was done:

    1. Charge air cooler to intake gasket replaced
    2. CAC matrix cleaned
    3. Valves adjusted
    4. Valve cover gaskets replaced (2 per engine)
    5. Port exhaust gasket replaced and turbo cleaned
    6. Starboard starter replaced
    7. CAC bolts replaced with longer bolts and an extension sleeve to increase clamping pressure on the CAC gaskets between the cover and the basket.

    The really careful cleaning of all gasket mating surfaces was something else I did not expect. He practically polished the intake gasket surfaces before applying silicone to the metal gaskets replacing the old paper ones.

    Picture of the bad intake gasket on the port engine.

    upload_2019-9-12_21-34-4.jpeg
  19. Beau

    Beau Senior Member

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    Congrats and good boating!
  20. PacBlue

    PacBlue Senior Member

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    Sounds like you are good to go, glad it all worked out for you!