Compatibility: The 3073707 Diesel Cummins Crankshaft is a part designed for M11 and QSM11 excavator engines. The crankshaft is a vital component that converts the reciprocating motion of the pistons into rotational motion, playing a central role in the engine's operation.
Physical Dimensions and Specifications
Length: The length of the crankshaft can vary depending on the specific design and engine requirements. Typically, it might range from around 1000 - 1500 mm. This length is designed to accommodate the proper spacing of the crankshaft throws and main journals to ensure the correct piston stroke and engine balance.
Diameter of Main Journals: The main journals, which rotate within the engine's main bearings, have a specific diameter. Usually, the diameter can be in the range of 100 - 150 mm. The precise diameter is crucial for proper fit and to ensure that the crankshaft rotates smoothly and with the correct clearances within the bearings.
Diameter of Crankpins: The crankpins, where the connecting rods attach, also have a specific diameter. This diameter is typically in the range of 80 - 120 mm. The size of the crankpins affects the torque - transmitting capacity and the overall strength of the connection between the crankshaft and the pistons.
Number of Main Journals and Crankpins: The M11/QSM11 Cummins crankshaft usually has a specific number of main journals and crankpins corresponding to the number of cylinders in the engine. For these engines, which are typically 6 - cylinder engines, there are usually 7 main journals and 6 crankpins. The additional main journal at one end provides extra support and stability to the crankshaft.
