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Frequently Asked Questions

If something’s not quite right with your vessel, you’re not alone. From starting issues to unusual vibrations or power loss, marine problems can pop up when you least expect them. We’ve put together answers to some of the most common issues boat owners face to help you troubleshoot and know when it’s time to call in the pros. If you’re still unsure, don’t stress—just reach out and we’ll be happy to help.​

1. Why won’t my diesel engine start?

Common causes include:

  • Dead or weak batteries

  • Air in the fuel system

  • Clogged fuel filters

  • Faulty starter motor or wiring

  • Water in the fuel

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2. What causes white/blue/black smoke from the exhaust?

  • White smoke: Often unburnt fuel or water in the fuel.

  • Blue smoke: Indicates oil burning, possibly from worn piston rings or valve seals.

  • Black smoke: Usually from incomplete combustion—check air filters, injectors, or overloading.

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3. Why is my engine overheating?

Typical causes include:

  • Blocked raw water intake

  • Failed impeller in raw water pump

  • Low coolant levels

  • Faulty thermostat or heat exchanger

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4. How often should I service my marine diesel engine?

Generally every 100–250 engine hours or annually—whichever comes first. This includes oil changes, filter replacements, and system inspections.

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5. What are the signs of water contamination in diesel fuel?

  • Difficulty starting

  • Poor engine performance

  • Visible separation or cloudiness in fuel

  • Corrosion or microbial growth in the tank

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6. Why is my engine vibrating more than usual?

Excessive vibration can come from:

  • Engine mounts wearing out

  • Misaligned shaft or propeller

  • Fouled prop

  • Imbalanced or bent propeller

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7. How can I prevent fuel system issues?

  • Use clean, high-quality diesel

  • Regularly drain water separators

  • Add biocide if storing fuel long-term

  • Change fuel filters regularly

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8. Is it normal for my engine to use some oil?

Some oil consumption is normal, but excessive use may signal leaks or internal wear.

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9. What should I do if my engine alarms sound while underway?

Immediately:

  • Reduce throttle

  • Check gauges (temp, oil pressure)

  • Stop engine if needed

  • Investigate cause before restarting

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10. Can I run my marine diesel engine dry to burn off old fuel?

No—marine diesels rely on fuel to lubricate internal parts. Running dry can damage the fuel pump and injectors.

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