The stay bolt, code 102262, is a highly loaded structural fastening component of the MAN L21/31 engine designed to securely connect and stabilize major engine structures while maintaining the required clamping force during operation. In a medium-speed diesel engine, such fastening elements must withstand substantial tensile forces, cyclic combustion loads, vibration, and thermal expansion without allowing unwanted movement or loss of alignment between connected components. The stay bolt is therefore manufactured and machined to demanding mechanical and dimensional requirements so that the specified preload can be applied and maintained reliably throughout service. Correct installation, tightening, inspection, and condition monitoring are particularly important because deterioration or incorrect loading of a structural bolt can affect load distribution and the stability of associated engine parts. By maintaining structural rigidity and correct alignment, the stay bolt contributes significantly to safe operation, mechanical durability, and the long-term reliability of the MAN L21/31 engine.
The seal ring, code 136973, is a precision sealing element used in the MAN L21/31 engine to maintain a secure barrier between adjoining components and prevent the unwanted passage of operating fluids or gases. Depending on its location within the engine assembly, the seal ring may be required to retain lubricating oil, fuel, cooling water, compressed air, or another operating medium while simultaneously protecting sensitive internal components against contamination. The component is designed to maintain effective sealing despite vibration, changes in pressure and temperature, mechanical movement, and thermal expansion occurring during engine operation. Accurate dimensions, suitable material properties, and correct installation are therefore essential to its performance. By maintaining system tightness and reducing the risk of leakage, the seal ring contributes to reliable engine operation, reduced maintenance requirements, protection of associated components, and a longer service life of the MAN L21/31 engine.
The gasket, code 100100, is an important sealing component used in the MAN L21/31 engine to provide a reliable, leak-tight joint between mating surfaces of various engine parts and assemblies. Its primary function is to compensate for small surface irregularities and maintain effective sealing against lubricating oil, fuel, cooling water, compressed air, combustion gases, or other operating media, depending on its specific installation position. Designed to withstand pressure fluctuations, vibration, thermal cycling, and mechanical stresses encountered during continuous engine operation, the gasket must retain its sealing properties throughout demanding service conditions. Correct material selection, dimensional accuracy, surface preparation, and installation are essential for dependable performance, helping to prevent leakage, contamination, pressure losses, and consequential damage while contributing to the overall reliability, efficiency, and service life of the MAN L21/31 engine.
The stopper plate K 34138 is a mechanical retaining and positioning component associated with the operating piston assembly of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its principal function is to provide a defined mechanical stop or secure retention of associated components, helping maintain the intended position and movement limits of the operating piston mechanism. Although comparatively simple in form, a stopper plate can perform an important safety and reliability function because incorrect positioning or excessive movement within a mechanical assembly may lead to increased wear, misalignment, impact loading, or damage to neighboring parts. The K 34138 is therefore manufactured to accurate dimensions and from material capable of resisting repeated mechanical loading, vibration, and long-term operating stresses. Correct installation and inspection of the plate and its contact or fastening areas are important during maintenance. By preserving the designed mechanical limits and stability of the operating piston assembly, the K 34138 stopper plate contributes to predictable operation, reduced component wear, and dependable long-term engine service.
The bush K 34137 is a precision bearing and guiding component designed for the connecting rod shaft within the operating mechanism of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its primary role is to provide an accurately dimensioned bearing surface between the shaft and its supporting structure, allowing controlled relative movement while reducing friction and protecting more substantial components from direct wear. During operation, the bush must accommodate repeated mechanical loads, oscillating or rotational movement, vibration, and the effects of long-term service without allowing excessive clearance to develop. Appropriate bearing material, accurate machining, correct fit, and effective lubrication are therefore important to its performance and durability. As a replaceable wear component, the K 34137 bush can also help protect the connecting rod shaft and surrounding assembly from more costly damage. By maintaining correct shaft guidance and minimizing friction and wear, the K 34137 contributes to smooth mechanical operation, accurate alignment, reduced maintenance requirements, and long-term reliability of the operating mechanism.
The pawl K 34136 is a precision mechanical engagement and locking component designed for the operating piston mechanism of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its primary function is to provide controlled engagement, positioning, or retention within the operating piston assembly, helping ensure that the associated mechanism moves and remains positioned as intended during operation. Because a pawl may be subjected to repeated contact forces, cyclic loading, vibration, and localized surface pressure, dimensional accuracy and resistance to wear are particularly important for dependable service. Manufactured from durable, high-strength material and precisely machined at its functional contact surfaces, the K 34136 is intended to maintain reliable engagement throughout repeated operating cycles. Proper condition of the pawl and its mating components helps prevent excessive play, irregular movement, and premature wear. By supporting accurate mechanical control of the operating piston assembly, the K 34136 pawl contributes to stable operation, reliable functioning, and long service life of the associated engine mechanism.