6BTA Cummins life expectancy

Maniac

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Just wondering if there is a average number on life expectancy of this engine with good maintenance
 

Benny

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I’m sure I’m at risk of getting roasted for saying this and I admit I’m biased but I don’t think there’s any engine out there with a better reputation for longevity and reliability. 6B is the foundation of that and a properly maintained and operated 6B, BT, BTA at any HP should last as long as any other engine of similar size.

Plus every knows you gain at least an inch of girth when you have a Cummins.
 

Diesel Jerry

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My experience, at 180 to 270 HP, somewhere between 15 to 20,00 hours with good maintenance. Above that horsepower rating it falls off to between 5 to 8000 hours. Normally they fail because of poor seawater cooling maintenance, overloading or a stuck injector melting a piston.
 

captjohn

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Life is very much dependent on the boat being properly propped (reaches rated RPM's at wide open throttle, not reaching it, even missing it by a little is no good), how hard the boat is run, and performing regularly scheduled maintenance, makes all the difference in the world. Don't do any of the above, expect as little as a few thousand hours. Do everything correctly, expect thousands of hours. Same holds true for any engine.
 

hardcore1

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It's more about fuel use then hours. But they are related. You can expect a rebuild between 30000 and 40000 gallons of fuel use. So if you burn 1gph for 20000 hours you're still in the workable life. If you burn 12gph for 3000 hours,. Then a rebuild is on the horizon. On average a 330 or 370 is good for 5000 hours of mixed use with good maintenance.
 

Diesel Jerry

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Jjammer

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It's more about fuel use then hours. But they are related. You can expect a rebuild between 30000 and 40000 gallons of fuel use. So if you burn 1gph for 20000 hours you're still in the workable life. If you burn 12gph for 3000 hours,. Then a rebuild is on the horizon. On average a 330 or 370 is good for 5000 hours of mixed use with good maintenance.
I've heard both Art Stanley and Tony Athens throw around gallons burned too, and both said 30,000-ish before rebuild for the 300+ hp B series. Art of course said Deeres last way longer. :)

My 6bta 315 burns 8/9gph at 2200, but "all in" burn with all the lower rpm putting around I do I'm down at like 3gph average burn.
 
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Jjammer

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Well yes and no. I have seen a lot of harm done just sitting idling using the engine as a battery charger (sail boaters). No real amount of fuel burned but lots of carbon build up and glazing of the cylinders. I have know owners scared to hit full throttle because fear of taking life out of the engine when in my opinion a diesel engine should hit full throttle a few times per season.
The idling thing is funny. I think it comes from truck stops who run all night in cold weather to keep the cab warm...but guys seem to think no-load idling diesels is the thing to do. My understanding from Tony A is no-load idling should be minimized, warm em up in gear at low rpm.
 

Diesel Jerry

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0000000000000

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It says in the cummins manual "do not idle for more then 10 minutes." Cant remember if that was for initial start up or for continuous operation. either way idling is not the intended use.
 

traditions

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Low oil pressure at idle, if yo are going to sit idle, bump up the RPM a tiny bit, watch the oil pressure go up. Engine life depends a lot on how it is used, not over wheeled, and top RPM . Ever notice how gensets have high hours, like in the 30,000. They run constant 1800 RPM. My 6076 Deere is around 40,000 hrs, and gets run at 1800 max, with occasional wide open. She turns 100 rpm light on the tach.
 
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