Addressing A Few Myths About Marine Diesel Engines

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Most of what you would learn about engines from other marine engineers and ship owners would be valuable. However, more than often, you would come across something that’s completely bogus. Trouble may soon be on its way if you apply just about everything you hear.

In this blog post, we shed light on some of the most common myths regarding diesel engines and help you spot out fact from fiction:

The Engine Should Be Set Idle To Warm Up After Starting

This is not true. In fact, marine diesel engines don’t really warm up until they are under load. Therefore, only let the engine sit idle for 30 to 40 seconds to facilitate circulation of oil. Don’t start moving immediately after starting up. Warm up the oil so it flows better.

Marine Diesel Engines Burn Less Fuel So It’s Okay To Let Them Sit Idle

While diesel engines may burn less fuel in idle state, it is not preferable to let the engine sit started for hours. The fuel may not combust fully due to low operating temperatures. Unburned fuel can lead to a number of problems for your engine. This includes pollution, diluted lubricant, and more chances of wear. Turn off the engine and avoid the trouble if you are not underway.

It Is A Good Idea To Throttle The Engine A Few Times Before Shutting It Off

Most people tend to rev the engine a few times before shutting it off, but this isn’t a good practice either.

They are under the impression that the practice will help circulate oil through the engine before it is turned off. The truth is a marine diesel engine sitting in idle state is able to circulate oil better.

Revving the engine before turning it off may leave unburned fuel in the chamber, starving the turbocharger bearing as it keeps going even after the oil supply dies. Doing so will eventually lead to fuel wastage.

Most Of The Wear In Marine Engines Occurs At High RPMs

The highest wear takes place at startups. Even though lube oil creates a thin film over moving components of the engine, it takes a few moments after startup for the oil to flow freely. This is the reason why many marine diesel engines have pumps to circulate the oil before the engine revs up. If your engine doesn’t have pumps or block heaters, it is a good idea to wait a minute before advancing the throttle.

We hope we helped you clear out these myths. Make sure that you do your research before applying anything you hear to your marine diesel engine. For a collection of high quality marine spare parts and marine diesel engines, get in touch with us today.

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