8112851 SP1 Volvo Compatible Twin Cylinder Compressor

What does a twin cylinder compressor do?

This twin cylinder compressor is an essential engine-driven component within the air brake system of heavy commercial vehicles, designed to generate consistent compressed air through two piston-cylinder assemblies. By utilizing two compression strokes per crankshaft revolution, this unit provides higher air output compared to single-cylinder alternatives, ensuring faster reservoir replenishment. The assembly is built with heavy-duty grade materials to withstand high-pressure operating environments.

Vehicle and engine compatibility

This specific model is engineered for Volvo FL12 trucks equipped with TD122 engines. It features a water-cooling configuration with M16x1,5 inlet and outlet ports to maintain thermal stability during sustained high demand. The unit includes an ESS feature and a water-cooled valve plate to optimize performance under heavy load conditions.

Installation and maintenance guidance

For correct installation, technicians should verify the gear drive configuration and mounting flange alignment. The unit features an Ø88.00 cylinder bore and a 50 mm stroke, with an air outlet port size of M26x1,5 and an air unloader port of M22x1,5. Ensuring the coolant lines are properly connected to the M16x1,5 ports is critical for maintaining the thermal stability of the valve plate.

Selection and troubleshooting

When replacing a worn unit, it is vital to match the mounting interface and port locations exactly to avoid system leaks or mechanical mismatch.

OE cross-reference

1300 050 006 (Twin Cylinder Compressor) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 8112851SP1.