Engine Testing - General Information Section 14 - Engine Testing - Group 14 M11 Page 14-2 Engine Testing - General Information This section outlines engine testing and engine run-in recommendations for M11 engines. All engines must be run-in after a rebuild or a repair involving the replacement of one or more piston ring sets, cylinder liners or cylinder kits. Incorrect or insufficient break-in of the piston rings will lead to early oil consumption or high blowby complaints. Adherence to these run-in guidelines will allow the full durability of new pistons, liners, and rings to be realized. Before running the engine, make sure the engine is filled with the proper coolant.
Also, be sure the lubricating oil system is filled and primed. In-Service Run-In The majority of heavy duty diesel applications will provide sufficient run-in under normal loaded operations. However, light load high rpm operation must be avoided during the run-in period. The following in-service run-in guidelines are recommended for M11 engines after a repair involving replacement of one or more of the piston ring sets, cylinder liners or cylinder kits where engine or an engine dynamometer or chassis dynamometer run-in cannot be performed. Engine Dynamometer Run-In This is the preferred method of run-in for engines that have been rebuilt out-of-chassis.
It is not practical, nor recommended that an engine be removed from the application to conduct the run-in after a rebuild or cylinder repair has been performed in-chassis. There is no requirement, nor is it recommended for an engine that has been run-in and tested on an engine dynamometer to be run-in again after it has been installed in the vehicle or equipment. Chassis Dynamometer, Portable Dynamometer or Load Bank Run-In When it is not possible to load an engine immediately after rebuild or repair, (example:
on-highway tractor that must be for delivery, a stand-by generator or fire pump that cannot be operated because of customer restrictions, a fire truck that cannot be loaded with the water pump, etc.), the engine must be run-in on a chassis dynamometer, portable dynamometer or load bank following the recommendations outlined in the attached procedures.