The guide bearing cap, code 11.01254-0169.A, is a precision-fitted component used to secure and guide the motion of critical engine elements such as the camshaft or auxiliary shafts within the MAN L21/31 engine. By stabilizing axial and radial movement, the guide bearing cap contributes to smooth engine timing and mechanical efficiency. Its durable design helps reduce wear, misalignment, and mechanical failure over time, especially in applications involving sustained operational loads.

The quality specification document, code 10.09412-3021-1.0, outlines the rigorous manufacturing and inspection standards for the MAN L21/31 engine. This specification ensures that all components, from castings to precision-machined parts, meet strict criteria for material integrity, dimensional accuracy, and performance reliability. It serves as a critical reference for OEMs, maintenance teams, and suppliers to guarantee consistent quality throughout the engine’s lifecycle and to uphold MAN Diesel's global reputation for engineering excellence.

The main bearing cap with code 11.01254-0168-1.B is a structural cornerstone of the MAN L21/31 engine, designed to securely hold the crankshaft's main bearings in place. Subjected to tremendous mechanical forces, this component ensures that the rotating crankshaft remains perfectly aligned during engine operation. Precision-machined and built to withstand stress, the main bearing cap plays a vital role in maintaining engine balance, minimizing vibration, and extending the lifespan of internal components in high-load marine or industrial environments.

The oil filling eye coded K 32379 is a functional element designed to facilitate easy and clean oil replenishment for the barring engine in the Sulzer ZV40/48 system. Typically located in an accessible position, it acts as both an entry point for lubrication oil and a visual inspection aid to monitor oil levels. Its presence ensures that the barring engine remains properly lubricated, minimizing wear on moving parts and contributing to the reliability and longevity of the entire mechanism.

The knob identified by code K 32378 is a user-interface component used for the manual engagement or release of the arrestor pin in the Sulzer ZV40/48 engine's barring system. This small yet crucial part allows operators to control the locking mechanism of the rotating shaft, ensuring safe operation during manual turning or when the engine is stationary. Engineered for ergonomic handling and durability, the knob simplifies an essential safety function in the daily handling of the engine.

The electric motor marked with code number K 32375 is a vital component of the barring engine system in the Sulzer ZV40/48 diesel engine. It provides the power necessary to slowly rotate the engine shaft during maintenance, inspection, or warm-up phases. By enabling controlled and gradual movement, the electric motor ensures technicians can safely align pistons and valves without engaging the full engine power. Its robust design supports consistent performance under varying operational conditions, making it an indispensable part of the engine’s auxiliary functions.

The main bearing cap, code 11.01254-0168.A, is a key mechanical component in the MAN L21/31 engine, responsible for securing the crankshaft bearings firmly in place. Its robust construction ensures that the rotating crankshaft operates with precise alignment under heavy mechanical loads. Proper design and installation of this part are vital for minimizing vibration, reducing wear on the crankshaft, and maintaining the overall integrity of the engine’s lower structure during continuous operation.

The QS Cylinder Crankcase, code 0743748-6.1, refers to a quality-specified version of the engine’s crankcase—one of the most essential structural parts of the MAN L21/31 engine. It provides a strong, precision-machined foundation for housing the crankshaft and other internal moving parts. Designed to withstand extreme loads and vibration, this crankcase is manufactured to the highest quality standards to ensure long-term structural stability in marine propulsion and power generation applications.

The quality specification document, code 10.09004-5200-1.0, for the MAN L21/31 four-stroke engine is a critical technical reference that outlines the exact standards and tolerances required during manufacturing and servicing. It ensures that each component meets MAN Diesel's rigorous performance, material, and dimensional criteria, contributing to engine safety, durability, and reliability. This document is indispensable for quality assurance teams, service engineers, and suppliers working with original or replacement parts.

The housing identified as K 32301 encloses the barring engine mechanism on the Sulzer ZV40/48 diesel engine. Designed to provide structural support and protection, it houses the gearing and drive elements responsible for slowly rotating the engine during maintenance or startup synchronization. Its design ensures secure alignment, easy access for technicians, and durability under varying loads, making it an indispensable part of the engine’s auxiliary systems.