Top 5 signs your engine needs a service – Northern Beaches Guide

At Johnson Bros Marine Services, based on Sydney’s beautiful Pittwater in the Northern Beaches, we know how much you rely on your boat engine to perform safely and reliably. Whether you're cruising through Pittwater, fishing off Barrenjoey, or exploring Sydney Harbour, keeping your engine in top shape is essential.

But how do you know when it’s time for a service? Below, we’ve listed the top 5 warning signs your boat engine needs professional attention, before a small issue becomes a costly problem.

 

1. Difficulty Starting the Engine

If your outboard engine is struggling to start, or won’t start at all, it’s a red flag.

Common causes include:

  • battery or ignition issues
  • old spark plugs
  • fuel delivery problems
  • clogged filters or injectors.

Don’t ignore slow starts or intermittent failures. A quick diagnostic check by a Johnson Bros Marine Services qualified marine mechanic can save you from being stranded on the water.

 

2. Unusual Noises or Vibrations

Your boat should run smoothly, if you're hearing knocking, rattling, grinding, or other strange noises from the engine, it could point to:

  • loose or damaged components
  • internal wear and tear
  • propeller shaft misalignment.

Likewise, excessive vibration isn’t just annoying, it may indicate an issue with your propeller, mounts, or bearings.

Pro tip: If your boat feels different under throttle or sounds “off”, it’s time to call Johnson Bros Marine Services.

 

3. Excessive Smoke or Exhaust Fumes

Notice more smoke than usual? Or strong fuel smells? These can indicate fuel or oil system problems, such as:

  • improper fuel mix
  • oil leaks
  • water in the fuel
  • faulty injectors or sensors.

Black smoke, blue smoke, or white smoke all point to different issues, but none should be ignored.

 

4. Reduced Power or Poor Performance

If your boat is losing speed, not reaching full RPM, or feels sluggish under load, don’t assume it’s just the tide or wind. Performance issues often trace back to:

  • dirty fuel systems
  • worn-out spark plugs
  • engine timing problems
  • dirty or damaged propellers.

Our marine mechanics and electricians at Johnson Bros Marine Services use advanced diagnostics to pinpoint the issue quickly and get you back on the water with confidence.

 

5. Increased Fuel Consumption

If you're burning more fuel than usual for the same trip, your engine may not be running efficiently. Causes include:

  • fouled plugs
  • poor combustion
  • fuel system obstructions
  • sensor malfunctions.

Not only is this bad for your wallet, it's worse for the environment. A well-serviced engine means lower emissions and cleaner boating on our local waterways.

 

When Was Your Last Service?

If you're noticing any of these signs, or you can’t remember when your engine was last serviced, it's time to book in.

At Johnson Bros Marine Services, we specialise in:

  • Outboard engine servicing, maintenance and repairs
  • Engine repowers and installations
  • 12 Volt electrical systems and full rewires
  • Sales, servicing and installation of Suzuki Marine outboards.
  • Slipway and antifouling services.

 

Serving Pittwater, Scotland Island, Western foreshores, Hawksbury River, Central Coast and beyond

With decades of experience and a reputation for reliability, our team keeps the Northern Beaches boats running at their best. We offer convenient on-site servicing, quick turnaround times, and expert advice.

 

Book Your Next Boat Engine Service Today

Don’t wait until you're stuck offshore with engine trouble. Contact Johnson Bros Marine Services today to book a service or inspection.

 

Stay Tuned for More Boating Tips

Looking for more marine maintenance tips? Follow our blog or [join us on Facebook/Instagram] for updates, how-to guides, and news about local boating events and services.