Main Engine Repair & Overhaul
Valnau Superyacht Services delivers professional main engine repair, overhaul and troubleshooting solutions for superyachts, covering both scheduled maintenance and critical breakdown scenarios.
Our team operates during planned yard periods or emergency interventions, ensuring minimal downtime and full technical compliance.
We work on high-performance marine diesel engines installed on motor yachts and superyachts, including complex propulsion systems, auxiliary integrations and engine room refit coordination.
Main engine services include:
Complete engine overhaul and rebuild
Cylinder head, liners, pistons and crankshaft works
Cooling system failures and oil contamination diagnosis
Fuel injection systems and turbocharger servicing
Alignment checks and vibration troubleshooting
Pre-purchase and condition assessments
Based in Valencia and operating across the Mediterranean, Valnau Superyacht Services supports captains, technical managers and owners with discreet, reliable and fully accountable engine repair solutions.
A Structured Approach to Main Engine Repair
Diagnosis & Technical Assessment
Comprehensive inspection and fault analysis of main propulsion engines, including performance issues, cooling failures, oil contamination, abnormal temperatures and mechanical wear, to define the correct repair scope from the outset.
Engine Repair & Overhaul
Execution of corrective and preventive engine works, from partial repairs to complete overhauls, including cylinder heads, liners, pistons, crankshafts, fuel systems and auxiliary components, following manufacturer specs.
Testing, Commissioning & Sea Trials
Post-repair testing, system checks and commissioning to verify correct engine operation, reliability and performance, including dock trials and sea trials when required.
Experienced Engine Specialists
Main engine repair works require highly experienced technicians capable of operating in confined engine room environments and under strict technical and safety standards.
Our team is composed of marine engineers and engine specialists with hands-on experience in diagnosis, repair and overhaul of main propulsion engines installed on superyachts.
All works are carried out either on board or during yard periods, following manufacturer specifications, approved repair procedures and industry best practices to ensure reliability, performance and long-term durability.