Announcement

Collapse
No announcement yet.

Belt slip / squeal. 330/370 Cummins 5.9BTA

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Belt slip / squeal. 330/370 Cummins 5.9BTA

    I replaced both belts on my motors over the winter. Now both belts squeal when the alternators are loaded at low rpm. One side is now slipping very badllty. I have the right belt size. Same length as the old belt. Can't remember what brand.

    Does anyone have a similar issue? Solution?

    1997 Bayliner 4788 "Mostly Harmless"
    Sold: 1990 Bayliner 3888

    #2
    First.... sometimes its common for the belts to squeal when they are cold and the alternator is pulling hard right after start up.... bring the idle up and let it play for 3-4 minutes and it should go away...

    are these serpentine belts or v-belts?.... when the serpentine belts squeal all the time, its time to look at the tensioner. if the spring base or the bearings are getting worn, it can throw it out of alignment... causing a squeal.

    and if the the alternator has gotten out of alignment, it will cause the same issue, but the b engines dont usually get an alternator mis-alignment.

    and dont overlook the alternator pulley itself.... due to the heavy pulling these get, they will wear out, and the only thing you can do is replace the pulley.. this is about the only problems with the serpentine belts on a B engine...
    if its v belts, the pulleys can wear out, causing a mis matched surface between pulley profile and belt profile... causing it to squeal...


    NU LIBERTE'
    Salem, OR

    1989 Bayliner 2556 Convertible
    5.7 OMC Cobra - 15.5x11 prop
    N2K equipped throughout..
    2014 Ram 3500 crew cab, 6.7 Cummins
    2007 M-3705 SLC weekend warrior, 5th wheel
    '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
    Heavy Equipment Repair and Specialty Welding

    Comment


      #3
      I really have to get the RPMs up to stop the slip. B-Series is serpentine. I've replaced the alternators on both sides and the tensioner on the side that is slipping badly, with no effect. It's like the belt is a hair too long or a pulley is slowing the belt.
      1997 Bayliner 4788 "Mostly Harmless"
      Sold: 1990 Bayliner 3888

      Comment


        #4
        Are your idler pulleys OK? Engines built up to the mid 90's and some of the remans have had these issues. Please see attached link....

        Idler Pulley Issues on Cummins 6BT / 6BTA 5.9 - Seaboard Marine (sbmar.com)

        Also - please check the belt routing, it is easy to get it wrong.
        Northport NY

        Comment


          #5
          Silly question, are sure you have it tensioned correctly?
          Mark
          USCG OUPV
          1990 4588
          Carlsbad, CA

          Comment


            #6
            I just changed one of my belts this week.

            This should be a no brainer. On that engine the belt tensioner pushes down on the belt so even if it was a hair long it would not matter.

            Lets go back to the basics here...

            Before you changed the belts all was fine???

            Now both engines slip???

            Either you put them on somehow wrong or they are not the right belts.

            KEVIN SANDERS
            4788 LISAS WAY - SEWARD ALASKA
            www.transferswitch4less.com

            Whats the weather like on our boat
            https://www.weatherlink.com/embeddab...59665f4e4/wide


            Where are we right now? https://maps.findmespot.com/s/36S4

            Comment


              #7
              Solved. Sanded the water pump pulley as smooth as silk, cleaned all the other pulleys, and replace the belt with Cummins OEM.

              Looks like not all belts are created equal. The OEM belt was noticeably heavier.

              1997 Bayliner 4788 "Mostly Harmless"
              Sold: 1990 Bayliner 3888

              Comment


                #8
                I have also found not all belts created equal. The replacements I bought and installed ended up shedding bits of material all over the place. Thinking they were a tad wide to begin with.
                Tony Bacon,
                Washougal, WA
                Caspian, MMSI 338355743
                1997 3788 Cummins 250hp

                Comment


                  #9
                  OK guys what replacement belts did not work out so well on your 330/370 Cummins?

                  I'm running NAPA belts and so far they are doing well.

                  KEVIN SANDERS
                  4788 LISAS WAY - SEWARD ALASKA
                  www.transferswitch4less.com

                  Whats the weather like on our boat
                  https://www.weatherlink.com/embeddab...59665f4e4/wide


                  Where are we right now? https://maps.findmespot.com/s/36S4

                  Comment


                    #10
                    This is what I used and won't use again: Gates K070846
                    Tony Bacon,
                    Washougal, WA
                    Caspian, MMSI 338355743
                    1997 3788 Cummins 250hp

                    Comment


                    • ksanders
                      ksanders commented
                      Editing a comment
                      Thanks! that is great to know!

                    • Bacon
                      Bacon commented
                      Editing a comment
                      Good to know the napa belts work well. I'll go with that next time. Napa store between me and the boat

                    #11
                    I have found the same issue with the Hino engines, dust in the engine room, always adjusting them when using NAPA or any jobber belts. Switched to factory Hino belts and they've run clean and without adjusting for 1000 hours now.

                    James
                    1989 Bayliner 3888, 175 Hinos,
                    Hurth 630's Onan 8kw MDKD
                    Lowrance Electronics!
                    Boating on Georgian Bay & the North Channel
                    Completed the Great Loop 07/25/19
                    AGLCA #8340
                    MTOA# 7469

                    Comment


                      #12
                      Tried two "Dayco 5080537". One on each motor. Both slipped badly.

                      I've ordered a pair of Gates HD "Green" FleetRunner K080537HD as a spare. The Dodge 6bta Cummins truck guys seem to swear by them.
                      1997 Bayliner 4788 "Mostly Harmless"
                      Sold: 1990 Bayliner 3888

                      Comment


                        #13
                        I'm moving this to motoryacht saved topics. This is important information that folks need to find easily.

                        KEVIN SANDERS
                        4788 LISAS WAY - SEWARD ALASKA
                        www.transferswitch4less.com

                        Whats the weather like on our boat
                        https://www.weatherlink.com/embeddab...59665f4e4/wide


                        Where are we right now? https://maps.findmespot.com/s/36S4

                        Comment

                        Working...
                        X