331.02.0003 MAN Compatible Fan Belt Tensioner

What does a fan belt tensioner do?

The fan belt tensioner is a mechanical component in the cooling system of heavy commercial vehicles that keeps the belt driving the fan at the correct tension. It consists of a spring-loaded arm and a bearing-mounted pulley that automatically compensates for belt stretch caused by heat and mileage. This ensures the fan operates at its designed speed to maintain stable engine temperatures.

Compatible MAN vehicles and engines

This component is specifically designed to fit a wide range of MAN vehicles, including TGS I, TGX I, TGA, LION'S REGIO, LION'S COACH, and HOCL models. It is compatible with engine configurations such as the D2676 and D2066, providing reliable performance in demanding transport environments. The unit is an essential part for maintaining engine cooling efficiency in trucks and buses.

Installation and maintenance guidance

When performing maintenance, it is recommended to check the tensioner whenever the belt is replaced. Technicians should verify that the pulley alignment is correct and that there are no signs of oil contamination on the pulley surface, which could cause slipping. Ensuring the center bolt is tightened to the manufacturer's specified torque prevents premature wear of the arm or bearing.

Maintenance and troubleshooting

Regular inspection of the tensioner helps prevent sudden cooling system failures. By ensuring constant pressure on the fan belt, this part supports the overall reliability of the engine's thermal management system during heavy-duty operation.

OE cross-reference

331.02.0003 (Fan Belt Tensioner Fan) is the equivalent of the Dayco and MAN OE numbers. This part directly replaces Dayco OE number APV1134. It also replaces MAN OE numbers 51958007428, 51958007429, 51958007436, 51958007459, 51958007477.