Engine Testing General Information
This section outlines engine testing and engine run-in
recommendations for N14 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 N14 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 and/or chassis dynamometer
run-in can not 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 reinstalled 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 ‘‘bobtailed’’ for delivery, a stand-by generator or fire pump that can not be operated because of customer
restrictions, a fire truck that can not 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.
Engine Testing General Information Section 8 - Engine Testing
N14Page 8-2
To Next Page
Loading...
