Vessel: Fairline Squadron 58
Engines: Twin Volvo Penta D12
Scope of Work: Tappet clearance and injector adjustment, rear main seal replacement
The owner of a Fairline Squadron 58 commissioned Ocean Marine Services to complete tappet clearance checks and injector adjustments on both Volvo Penta D12 engines. During inspection it was also identified that the rear main seals required replacement to prevent future oil leaks. These works formed part of essential ongoing yacht maintenance to protect performance, reliability and engine longevity. The project was delivered by our marine engineering team in line with Volvo Penta servicing procedures and best practice marine diesel repairs across the South Coast.
The service presented several challenges. Adjusting tappets and injectors on large marine diesel engines required precision, with exact tolerances and strict adherence to Volvo Penta procedures. Replacing the rear main seals involved careful disassembly and precise alignment to avoid damage during installation. Although the Squadron 58 has a relatively accessible engine bay, efficient planning was still required to work safely and effectively on both engines. The project also had to be completed promptly to ensure the vessel was ready for upcoming use.
Ocean Marine Services began by preparing the vessel, isolating power and removing the necessary covers and components to gain access to the valve gear, injector assemblies and rear main seals. The tappets were adjusted to Volvo Penta specifications to achieve correct timing and smooth running, while the injectors were calibrated for accurate fuel delivery and clean combustion. The rear main seals were removed, mating surfaces cleaned and new OEM Volvo Penta seals installed to eliminate oil leakage. Once reassembled, the engines were run and carefully checked to confirm correct idle, smooth acceleration and stable operation. A detailed service report was provided to the client, outlining all adjustments, measurements and parts replaced.
Both Volvo Penta D12 engines now run more smoothly with optimised fuel delivery and no oil leaks from the rear main seals. The service restored peak performance and provided important preventive protection against downtime caused by oil contamination or component wear. This case demonstrates Ocean Marine Services expertise in Volvo Penta servicing, marine engineering and professional yacht maintenance across the South Coast.
