What is considered high hours on a marine diesel engine?

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Raina Auer asked a question: What is considered high hours on a marine diesel engine?
Asked By: Raina Auer
Date created: Wed, May 12, 2021 5:46 AM
Date updated: Wed, Jul 6, 2022 7:53 AM

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Top best answers to the question «What is considered high hours on a marine diesel engine»

A Closer Look at the Numbers

On average, marine engines run this long: Outboard diesel motors usually run for more than 3,000 hours. Inboard marine diesels should run for an average of 5,000 hours. Well-maintained diesel engines run up to 8,000 hours.

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So what are the average hours a boat engine has? Gasoline boat engines run for an average of 1500 hours before the need for an extreme overhaul. While the average marine diesel engine will run more than three times the gasoline engine will and can log about an average of 5000 hours under the same conditions.

The marine engine hours are a good metric of how long the boat has been used in any capacity, which can be valuable information for resell, maintenance, and upkeep. In terms of maintenance, our diesel specialists consider both miles and hours. We base our marine diesel maintenance schedules off both hours and calendar time between visits. For maintenance, your marine engine hours are important to understand when to stop by for your next upkeep appointment.

The other aspect that comes immediately to mind is maintenance. No engine will survive if it is not properly maintained. One instance of overheating can ruin an engine whether it has 30 or 30,000 hours. Failure to maintain the cooling system is probably a more common fault than failing to change oil and filters.

10,000 hours seems to be the upper limit on most Yanmars. Of course you do have to send the injectors out for recalibration/rebuild about every 2000 hrs. and the Injector pump out at 5000 hrs. if you want a 'perfect' engine.

The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions. The number of hours that a marine engine runs is very dependent on the amount and quality of maintenance over the years.

A marine diesel engine is supposed to last for an average of 5,000 hours. Unfortunately, a poorly-maintained marine diesel engine is liable to last a lot shorter. Poor cooling. The first harm that could be done to a marine diesel engine is not ensuring it cools properly.

If a boat is four years old, then about 200 hours would be about normal. If it’s five years old, 250 is about right, and so forth. Rinda’s TechMate diagnostic tool can help with determining engine hours on a used boat with electronic fuel injection. But there are exceptions to the rule.

with normal maintenance I/O motors will go well over 3000 hours. 1000 hours is just broken-in in most cases as there are many hours of idling, light cruising, etc even if the motor was at 4000 RPM its whole life, that would be like a car doing 80 mph for 72000 miles Maintenance is the key.

Most marine engine manufacturers recommend an oil change every 50 engine hours. Our 1000 hour boat serviced every 50 hours would have had the same 20 oil changes. Similar levels of wear can be assumed in this example. Some newer vehicles have an engine hour meter. Here is a picture of the hour meter on one of our shop trucks.

Diesel engines generally run for a couple thousand more hours than their gasoline counterparts. Diesel engines also generally have more horsepower than the typical gasoline engine. They are also more efficient due to the type of fuel. Diesel engines, however, are more expensive and heavier than gasoline engines. They are also louder than gas engines.

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