jeffreyralph
24.04.2021 15:36:10
Two indicators that can alert you to potential trouble are the color of exhaust smoke and changes in the appearance of your oil when you check it.
See full version: The Life Expectancy of the Marine Engine
Two indicators that can alert you to potential trouble are the color of exhaust smoke and changes in the appearance of your oil when you check it.
Weekend boaters checking the oil before starting should be suspicious of oil levels that are too high or too low. here
Exhaust gases from marine engines should be clear. Any color of smoke can warn you of potential trouble.
Engines like to run long and steady. The shorter the running time between stops, and the longer the idle time between runs, the fewer the hours they will deliver before needing major repairs.
A well-maintained gasoline engine run under the best conditions may well run for more than the 1,500 hours without major overhaul. However, many that operate under the most atrocious conditions of salt air, damp bilges, intermittent operation and pure neglect will certainly die early. here
More horsepower from the same engine block will reduce the life expectancy. For instance, the Caterpillar 3208, a popular boat engine (of yesterday) is rated at 210 h.p. Add turbo charging and after cooling and, voila 435 h.p. More than double the horsepower but with a significant decrease in life expectancy. A competition pulling tractor named Silver Bullet has a nitro burning, blown Cat 3208 producing an estimated 3,000 to 5,000 horsepower; no life expectancy information was available. And we think our boat engines have it rough!
Craig Stange, a San Diego based Detroit Diesel engine specialist said he has seen a 71 series engine run for 7,000 hours before ring and cylinder liner wear lead to excessive blow-by. He noted that two stroke engines (like the old 71 series) wear out faster than four stroke engines and he uses 5,000 hours as an average life expectancy. He stressed that more horsepower results in less engine life.
The web sites BoatSafe.com and DiscoverBoating.com state that an average gasoline boat engine will run for 1,500 hours and the average diesel will last 5,000 hours before requiring a major overhaul, and a well maintained diesel may last 8,000 hours. more
This is a frequent question from potential boat buyers. Most mechanics and marine surveyors answer with some version of… “well, it all depends”. For this article I tried something different – research.
Randy Hynd, of Sunset Marine, a San Diego dealer for several popular gasoline marine engines said in his thirty years in the business he has seen two outboard engines wear out, and they had over 6,000 hours. He is aware of government vessels with over 4,000 operating hours on gasoline inboard/outdrive engines, and they “hardly ever wear out”. more
Yanmar dealer PacWest Marine (San Diego) and distributor Boatswain’s Locker (Costa Mesa) mentioned 10,000 operating hours as a target for Yanmar engines and they report knowledge of a Japanese government boat with over 40,000 hours on its Yanmar engine. [links]
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Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. more
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Diesel engines are built to finer tolerances than are gasoline engines. They will accept much more abuse and often deliver, if well maintained, 8,000 hours of hard work before need a major overhaul. Theoretically, a well-maintained diesel may last the life of your boat. Since the average recreational boater logs only about 200 hours per year, the 8,000 hour diesel would last 40 years.
Exhaust gases from marine engines should be clear. Any color of smoke can warn you of potential trouble. [links]
Two indicators that can alert you to potential trouble are the color of exhaust smoke and changes in the appearance of your oil when you check it. [links]
Two of the most important rules of thumb for engine compartment blowers on gasoline engines are that they should always be set to exhaust, not to blow air in, and they should be run for a minimum of 5 minutes before starting the engine. here
Re: What is really considered "low hours" here
Re: What is really considered "low hours" more
My 4.3LX is nearing 1000hrs,+ Still shows New Rebuild compression #s.
What is considered low hours on a boat? In a vehicle, 12k miles year seems the accepted mileage, and anything much below that is typically considered "low miles". What's the equivelant for boats?
Re: What is really considered "low hours" [links]