Yanmar 129100-77501 Air Heater Assembly

The Yanmar 129100-77501 air heater is an intake air heating device designed for Yanmar TNV/TNE series diesel engines. It operates by heating incoming combustion air to improve cold-start reliability and reduce white smoke emissions during low-temperature operation. The unit features a non-immersion type heating element with integrated electrical connector and threaded mounting flange for direct installation into the intake manifold. Cross-reference interchangeability includes Yanmar part numbers 129579-77500, 129120-77502, and 129120-77501. Equipment manufacturers Komatsu and Hyundai Heavy Industries reference this component under YM129100-77501 and 129120-77501 respectively. Application spans Yanmar 4TNE84, 4TNE82, 4TNV88, 4TNE86 engines and Komatsu 3D75, 3D78, 3D84, 3D88E, 4D84, 4D88E derivative engines used in PC27R-8, PC27MR-2 mini excavators and SK818-5, SK820-5, SK714-5, SK815-5 skid steer loaders.