The PRO-SMH SY43060 is an aftermarket timing gear designed for various Yanmar 3TNV and 4TNV series diesel engines, including models such as 3TNV88, 4TNV88, 4TNV98, 4TNV94L, 4TNV84T, 4TNV84, and 3TNV84T. This critical engine component ensures precise synchronization of engine valves and pistons, contributing to optimal engine performance and reliability. It serves as a direct replacement for the Yanmar OEM part number 129001-11100.