The shaft with code K 28025 is specifically designed to support and align the main rocker arm (K 28005) within the ZV40/48 engine. This robust shaft acts as a pivot point for the rocker arm, allowing it to transfer motion from the camshaft to the valves with mechanical precision. Built from hardened, wear-resistant steel, it must withstand constant mechanical stress and thermal cycling. Its proper function is essential for maintaining accurate valve timing and reducing wear in the valve train, directly affecting engine efficiency and reliability over time.

The nipple coded K 27752 is a small but essential component that facilitates the connection of an indicator valve to the ZV40/48 diesel engine. Used primarily during performance diagnostics, this nipple provides a secure and pressure-tight interface through which cylinder pressure readings can be obtained in real time. Manufactured from high-strength, heat-resistant materials, it ensures safe operation even under high combustion pressures. Its role is critical during engine tuning, maintenance, and troubleshooting, as it enables precise monitoring of in-cylinder conditions without disassembly.

The water guide jacket, code P50507-03, plays a vital role in the thermal management of the MAN L21/31 engine by channeling coolant around critical engine components, such as the cylinder liners and combustion chamber. It ensures even heat distribution, prevents hotspots, and supports optimal engine temperature during operation. Constructed from corrosion-resistant materials, the jacket helps extend the life of internal parts and safeguards the engine against overheating, making it indispensable for sustained high-performance use at sea or in power plant conditions.

The valve spindles and valve gear assembly, code P50502-18, are essential for the timed control of gas exchange within the MAN L21/31 engine. This system regulates the opening and closing of intake and exhaust valves, ensuring precise airflow and exhaust management during each engine cycle. Made of high-strength alloys and engineered for minimal wear, these components operate under heavy mechanical and thermal loads. Their performance is crucial for efficient combustion, fuel economy, and long-term engine reliability in demanding operational environments.

The cylinder head, code P50501-27, is one of the most critical components in the MAN L21/31 engine, forming the upper seal of the combustion chamber. It houses the intake and exhaust valves, fuel injectors, and part of the cooling and lubrication circuits. Designed for high durability and thermal stability, the cylinder head must endure extreme temperatures and pressures during continuous engine operation. Its precise machining and structural integrity are key to maintaining efficient combustion, proper sealing, and overall engine performance in both marine and power generation applications.

The bolt marked K 28034 is a specially engineered fastener designed for securing the main rocker arm (K 28005) in the ZV40/48 engine. This bolt must withstand dynamic mechanical loads, thermal fluctuations, and vibrations encountered during valve operation. Manufactured from high-strength alloy steel and precision-machined for perfect fit and tension, it plays a vital role in ensuring stable rocker arm performance. Its reliability is crucial for maintaining accurate valve timing and reducing mechanical stress on the valvetrain.

The O-ring coded K 28045 is a specialized sealing component used with flange K 28030 in the ZV40/48 diesel engine. Designed to provide a tight, leak-free seal in high-pressure and high-temperature environments, this elastomeric ring prevents oil or gas escape from the flange connection. Its flexibility, resistance to thermal expansion, and chemical durability make it indispensable for maintaining internal system pressure and preventing operational losses. As part of the engine’s sealing network, it supports overall performance and reliability.

The cover with code K 27007 is a crucial protective component paired with the bearing casing K 28000 in the ZV40/48 diesel engine. It shields internal bearing assemblies from contaminants such as dust, oil mist, and moisture while retaining lubrication within the casing. Engineered from corrosion-resistant materials and precisely machined, the cover ensures structural integrity, minimizes wear, and helps maintain the alignment of rotating components. This essential part contributes significantly to the engine’s durability and reduces maintenance needs over long service intervals.

Jacketed packing rings with code EN14U2429 are advanced sealing elements used in critical areas of the MAN L21/31 engine where high-performance sealing is required. Featuring a soft core (often graphite or PTFE) surrounded by a durable metal jacket, these rings combine flexibility with strength, adapting to surface imperfections while resisting extreme heat and pressure. They are commonly installed in exhaust, cylinder, or high-pressure sealing areas, ensuring leak-proof performance and long-term durability.

The oval packing, code EN14DB029052, is a specially shaped sealing element designed for the MAN L21/31 engine to ensure a tight fit between mating surfaces. Often used in valve housings or flanged joints, its oval geometry provides superior surface contact, enhancing its ability to prevent oil, fuel, or gas leaks under variable loads. Its resilience to heat, pressure, and chemical exposure makes it a key component in maintaining engine reliability and environmental safety.