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- Cummins Marine Forum Topics
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Qsb-380 Coolant loss
This topic has 8 replies, has 6 voices, and was last updated by 3 years ago
January 2, 2019 at 3:40 am I am on my second full year of ownership of a 390 sundancer. I’ve noticed a small loss of coolant on the expansion bottle with no visible leaks, oil clean without any moisture. I remember reading that it could be a problem with the turbo gaskets or cracks. I am ordering parts for my after coolers now and would like to address this issue now. The after coolers were never serviced, one a total loss, one rebuildable
8 RepliesNovember 20, 2020 at 5:53 am Iāve been told to run engines with cap not fully locked down for a while to allow air to escape.
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Qsb 5.9 aftercooler test pressure
This topic has 7 replies, has 3 voices, and was last updated by 5 years ago
March 24, 2019 at 6:32 am I have removed my intercoolers for the first time and found one to be totally unserviceable and I’m hoping the second will pass the leak test. What is is pressure used on the core and do I need to test the fully assembled unit too? I believe the replacement unit has been modified to the Seaboard standards already and doesn’t need to be greased
7 RepliesMarch 26, 2019 at 6:06 am 20 PSI is fine………Pits inside the cooler housing do not matter–Only the flat sealing surface ( on each end) after block sanding…….. Our coolers come pre-greased and are good for 2 years or so before you need to service it again if in seawater.. If you fresh water flush diligently when at the dock, you can easily double the service time interval. Tony
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Old oil sample
This topic has 3 replies, has 2 voices, and was last updated by 6 years ago
November 26, 2017 at 6:15 am I Performed an oil change on QSB 5.9 engines 10 days ago. The boat is new to me since July. The oil sample were no longer available the day I went to do the service so I have dated oil in my garage. I think a bench mark is important but is it too late to get a meaningful analysis at this late date?
3 RepliesNovember 27, 2017 at 6:21 am IMO just send it in as-is but you can check with the labs on your concerns prior to sending it in.
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Qsb380 2005-2006 Sea Ray Sundancer
This topic has 5 replies, has 5 voices, and was last updated by 6 years ago
May 29, 2017 at 8:10 am I am between buying either a 2005 or a 2006 sundancer, both with Qsb 380s I was told they didn’t have the quiet idling common rail fuel system until 2006. Is there any difference in these engines? I can’t find anything to support this claim This would be my first diesel boat
5 RepliesJune 15, 2017 at 10:30 am I just bought a 2007 formula 40pc with dual qsb’s and so far so good … they are a dream to run and i couldn’t be happier so far .
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Qsb-380 Coolant loss