Abstract: The objective of this paper is to calculate the design of timing gears trains for MICO Tractor Engine (80hp), which is an inline, 4-stroke, 4-cylinder diesel engine. The engine is produced maximum rated output power of 59.68kW (80hp) at 1800 rpm. This timing gear trains for Tractor Engine is incorporated with helical gears. It consists of five helical gears are used. Synchronize mesh is used for this timing gear for tractor engine. This paper is consider the design calculation of timing gear. Tooth load is calculated with help of Lewis equation & dynamic tooth load is calculated with help of Buckingham equation. Static analysis of the gear is done to find the von-Mises stress on the tooth of the gear in while meshing with Autodesk software.