Official Cummins QSC-500 Thread

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by Hampton, Nov 16, 2011.

  1. Airplane Guy

    Airplane Guy New Member SILVER Sponsor

    11
    Feb 26, 2013
    Noank Ct
    2006 44 Searay Sedan bridge
    2005 Zodiac Yacht line 340, 30 hp Yamaha
    GHS hydraulic Lift
    Cummins QSC 500
    Thanks for the advice
     
  2. JV II

    JV II Active Member SILVER Sponsor

    Nov 17, 2007
    Newport, RI
    2016 50 Fly
    Volvo Penta D11
    There may be more than one problem causing all this and you may have peeled away a few of them. Looking at your Racor filteres, I noticed that one of them shows dirt only on the lower half. My 48DA was doing that on one engine. The problem was air seeping into the fuel system under the Racor cover. The bowl was half empty when I checked it on one of the filter housings. It was a recurring issue and the cover was very sensitive. I needed to crank it down hard and make sure ther rim was super clean. Once the tab on the Racor handle got pinched in the gasket. It did not cause a performance problem all the time, but when it did at worst it would air lock the engine. At best, it would hesitate.
     
    Last edited: Jul 8, 2018
  3. sb in gp

    sb in gp Member SILVER Sponsor

    746
    Oct 10, 2006
    Grosse Pointe, MI
    44 Sedan Bridge 2006
    Cummins QSC-500
    I change my impellers every 2 seasons during winter layup. I take the pumps off because it is easier to pull and install the impeller on the bench. My impeller kit comes with an o-ring for the pump but I’d like to replace the o-rings on the in/out pipes that connect to the pump. Can anyone tell me the part number for those o-rings?
     
  4. villain style

    villain style Active Member SILVER Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8,3s
    Cummins QSC 8.3s 500HO
    Boat is new to me with 950Hrs so I am doing some PM work. I am installing new belts to start with. Is there any reason that I should be changing the Idler Pulley or Tensioner also? Do they have a service schedule as well?
     
  5. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    That is the first thing I did when I got my boat as well. I had one belt that was making a little “dust.” I did not change anything but the belts, and no more dust. If you go back and read the beginning of this thread, there is a lengthy discussion around the belts. I keep one new one and the best one of the two I changed out as spares. It appears that Cummins’ are notorious for going through belts.

    Bennett
     
    villain style likes this.
  6. villain style

    villain style Active Member SILVER Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8,3s
    Cummins QSC 8.3s 500HO
    Does anyone have P/N for Thermostats and gasket? I also heard there were two thermostats per engine. Is that true? if so are they the same? Thanks..
     
  7. Jaybeaux

    Jaybeaux Active Member SILVER Sponsor

    213
    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    villain style...re belt tensioner.....if it looks like this, change it! 20170916_123412.jpg
     
    villain style likes this.
  8. swaterhouse

    swaterhouse Active Member GOLD Sponsor

    329
    Jan 7, 2015
    Mattapoisett, MA
    2007 Sundancer 44
    Cummins QSC 8.3
    Thermostat 3972537
    Gasket (need 2) 145581

    You may also want o-ring 145582, it's between the pipe and heat exchanger, you need to remove that pipe to get to the thermostat.

    There is only one thermostat per engine.


    You can register at https://quickserve.cummins.com with one or both of your engine serial numbers, from there you get all the parts diagrams, manuals etc.
     
    importmonkey and villain style like this.
  9. villain style

    villain style Active Member SILVER Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8,3s
    Cummins QSC 8.3s 500HO
    Thank you - I am on Quickserve.cummins but I cannot get to any parts diagrams. I'll look again. Thank you for the response..
     
  10. swaterhouse

    swaterhouse Active Member GOLD Sponsor

    329
    Jan 7, 2015
    Mattapoisett, MA
    2007 Sundancer 44
    Cummins QSC 8.3
    I assume all regions have the same pages but maybe not.

    In pic below, select one of your ESN's on the left, then above that click Parts.

    Once on the parts view, make sure you select "Display Upfits" to show the marinized portions of the engine that were supplied from the factory (which for Sea ray was everything painted white and attached to engine).

    Untitled.png
     

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