What Should a Pre-Purchase Marine Diesel Inspection Include? #
The propulsion engines, generators and transmissions can represent a significant portion of the future repair and maintenance cost of a yacht.
A focused pre-purchase mechanical inspection can help buyers better understand the condition of these systems before completing the purchase.
Marine Diesel Engine Inspection #
Depending on the scope, the engines may be evaluated for:
- Starting behavior
- Visible leaks
- Engine oil condition
- Coolant condition
- Belts
- Hoses
- Engine mounts
- Cooling-system components
- Fuel-system condition
- Exhaust condition
- Fault codes
- General engine condition
Electronic diagnostics may also provide stored fault information on compatible engines.
Marine Generator Inspection #
Generator evaluation may include:
- Starting performance
- Raw-water flow
- Fluid condition
- Cooling system
- Fault codes
- Electrical voltage
- Frequency
- Performance under load
A generator that starts does not necessarily operate correctly once electrical demand is applied.
Marine Transmission Inspection #
Transmission inspection may include:
- Fluid condition
- Leaks
- Engagement
- Unusual noise
- Vibration
- Cooler condition
Sea Trial #
A sea trial is an important part of a comprehensive mechanical evaluation because many problems only appear under load.
The inspection may evaluate:
- Maximum engine RPM
- Temperature
- Smoke
- Vibration
- Acceleration
- Engine alarms
- Overall performance
Additional testing such as oil analysis, compression testing or borescope inspection may be recommended when concerns are found.
Learn more about Marine Diesel Engine Surveys & Inspections.
