John Deere squeak

Discussion in 'Downeast Engine Room' started by Amaralfish, Jun 27, 2019.

  1. Amaralfish

    Amaralfish Member

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    Finally got the boat going and ready to fish out here in California. Ran the boat up the coast and a few cod trips with no issues.
    Went to load up some gear and when I started the motor I got a squeak.
    Ran it for a few hours and still squeaking.
    Idler and tensioner look good oiled them to be safe.
    Any ideas?
    I ordered a new alternator and belt going to try that next week when I go to the boat.
     
  2. Dslpwr

    Dslpwr Senior Member

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    Most likely it’s the belt. What model engine is it?
     
  3. Amaralfish

    Amaralfish Member

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    2006 6068 300hp serpentine belt manual tensioner
     
  4. Dslpwr

    Dslpwr Senior Member

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    Make sure your pulleys line up, put a straight edge on them to check them, I have found that engine the where never all running true
     
  5. Amaralfish

    Amaralfish Member

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    Went to the boat today.
    Installed New alternator and belt and still squeaking.
    Pulleys are lined up perfect
    Only thing I can think is the water pump
    Should a water pump only last 1600 hours?
    My QSM11 on my old boat was trouble free for over 10000 hours only had a alternator go out at 9000 hours
     
  6. Dslpwr

    Dslpwr Senior Member

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    Did you spin all the idlers and water pump pulleys to see if turned smooth and it they any play. I have replaced these pumps from 7500hrs and beyond
     
  7. Amaralfish

    Amaralfish Member

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    Idlers and water pump seem smooth
    Maybe it’s no big deal. But it drives me crazy
     
  8. Dslpwr

    Dslpwr Senior Member

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    I’ll do a search on Deere service advisor tonight and see if there’s a solution
     
  9. c1steve

    c1steve Senior Member

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    A rough bearing can be very difficult to feel when installed. I would start with spraying the belt with some water, while running. If squeak goes away for a few seconds, it is belt related.

    1600 hours is plenty for a raw water pump. Ideally have two identical pumps, completely set up and ready for instllation. You can swap them as needed, and repair at your leasure.

    I would try the water test, then very, very carefully slowly roll any pulley bearings in my hand. Remove the component to do this, do not test while bolted in place as the mass of the engine can hide roughness.

    You could order a new raw water pump, install it, then overhaul the current one. This saves time and give you a spare ready to go.
     
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  10. Amaralfish

    Amaralfish Member

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    I tried the water test. No difference
    I’m gonna down to boat Saturday with a stethoscope. By ear it sounds like it’s the coolant circulation pump
     
  11. Captinlon

    Captinlon Senior Member

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    I am interested to see what you find. I have a 6068 rated at 265 and have been trouble shooting the same problem. Replaced belt and mechanic says he cant find anything wrong. I was also thinking the circulation pump.
     
  12. Ben Zehnder

    Ben Zehnder Member

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    Check your shaft ground also. I fooled with my alternator for three years before my friend lifted the deck hatch and showed me that the ground point was squeaking on the shaft. A dab of dielectric grease Solved it.
     
  13. Amaralfish

    Amaralfish Member

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    Found the squeak!
    It was the raw water pump
    Drop off oil on the shaft and it quit
    Gonna run it tomorrow see how it goes.
     
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  14. steveinak

    steveinak Captain

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    Who'd a thunk it ! good luck
     
  15. Amaralfish

    Amaralfish Member

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    Did two offshore trips 12 hour days no issues. Now I gotta chase down a hydraulic leak.
     
  16. steveinak

    steveinak Captain

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    what/where do you think it is ?
     

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