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Old 08-07-2020, 10:23 PM   #1
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Smile When to replace hoses 2002 Cummins

My 42 Nordic Tug has a single 6CTA8.3M engine, 2002 model, and an Onan generator of the same age.

For proactive maintenance, is there a time when all of the hoses should be replaced? I donít have any maintenance records from the PO, therefore my question....

Many thanks!
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Old 08-08-2020, 07:42 AM   #2
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Now would be a good time. Then youíll know the history.
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Old 08-08-2020, 07:51 AM   #3
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The port engineer I used to work for said 12 yrs on all hoses. That's 12 yrs from date of manufacture not 12 yrs of service.
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Old 08-08-2020, 08:07 AM   #4
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The above make sense I add that if you see any cracking replace then regardless of age. Consider new clamps as well.
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Old 08-08-2020, 08:13 AM   #5
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I don't know about price for Cummins parts, but my Perkins parts are pretty reasonable. I replaced all hoses, hose clamps, lift pump, and both water pumps. I think all-in the parts were around $750 or so, but not positive as I did some other work at same time. I know the water pumps were surprisingly inexpensive - something like $400 for both. Good for the soul.

10 years or abnormal wear sounds about right. For me, had been more than 10 years and everything looked fine, but wanted preventative maintenance.
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Old 08-08-2020, 09:21 AM   #6
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The service manuals don't cover the change frequency at least for the Qsb which is a cousin to your engine. They are "long life" belts. I think the previous advice is good and I would change them if you think they may be original.
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Old 08-08-2020, 10:33 AM   #7
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Replace the belts by all means and keep the old as spares.
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Old 08-08-2020, 11:43 AM   #8
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I replaced all the hoses and clamps on my 2003 Yanmars this Spring when I took all the coolers off for cleaning. The hoses were all in good shape, but I figured that after 17 years it was time.
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Old 08-08-2020, 12:04 PM   #9
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I have a yr 2000 6CTA 450 with about 4000hrs. About 4yrs ago I pulled all the coolers, cleaned them, and while doing that put on all new hoses and put in fresh coolant. The hoses were still in pretty good shape, but with all that stuff off it was easy. Puts the mind at rest.

If you are going to replace the hoses, do the coolers at the same time.
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Old 08-08-2020, 05:05 PM   #10
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Originally Posted by mvweebles View Post
I don't know about price for Cummins parts, but my Perkins parts are pretty reasonable.
Far cheaper still is to buy good quality silicone hose by the meter on ebay and cut yourself and have plenty left for spares
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Old 08-08-2020, 06:15 PM   #11
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I would think that 18 year old hoses are due for replacement. Better and easier to do it at the dock on a scheduled basis than underway in heavy weather.
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Old 08-08-2020, 07:16 PM   #12
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When we took possession of our boat six years ago there was a full set of spare hoses for both Lehman 120s. Not knowing the age of them existing hoses I replaced all even though they all looked just fine. Even if I didn't have those spares I would have replaced them.
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Old 08-08-2020, 07:42 PM   #13
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When we took possession of our boat six years ago there was a full set of spare hoses for both Lehman 120s. Not knowing the age of them existing hoses I replaced all....
American Diesel sells a complete set of hoses in a package,the likely source of the pack you found. Worth knowing if you own these excellent engines.
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