In our experience, diagnosing and solving some mechanical problems,

begins with a dive service.

A dive clean & inspection including photos from Bowline Marine can help diagnose the following 'mechanical' symptoms:

  • Poor boat performance including inability to plane under power or loss of steerage

  • Excessive black smoke from diesel & petrol engined vessels when under load

  • Shuddering from the propeller and shaft/s

  • engine overheats from shaft drives, stern drives and sail drive systems

  • Blockages in through hull openings

  • Trim tabs not functioning properly

  • Bow thruster lack of power

  • Impact from grounding in shallow water or rope entanglement


In some cases it will be necessary to consult a qualified marine mechanic.
Bowline recommends our sister company, Sydney Harbour Slipways for regular mechanical servicing and repairs, rebuilds and re-powers using Yanmar, Volvo and Mercruiser engines.



Bowline Marine Propeller Clean
Sydney Harbour Slipways Boat Mechanical Service
In-water mechanical diagnosis

For bookings & information call
0414 484 309

Marine Mechanical Services


  • Petrol engines Mercruiser, Mercury, Volvo & Yamaha

  • Diesel engines Volvo, Yanmar, Cummins, CAT, Onan

  • Engine cooling systems heat exchangers & manifolds

  • Gensets service & repair

  • Startermotors and marine electrical 

  • Engine servicing though to rebuilds

  • engine repower

  • Engine fuel systems: injector & fuel pump repairs

  • Trim systems & hydraulic steering


For bookings & information call

(02) 9954 3080