CUMMINS N14 Specifications download pdf (Page 442)

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 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-Chassis 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-chassis 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 chassis dynamometer or load bank run-in can not be

performed.

SRT 14-704, Engine - Run-In and Test (In-chassis) provides time for in-chassis run-in when there is no other way

to perform the run-in (chassis dynamometer, load bank or portable dynamometer) and the engine will be applied

in high speed/low load operation immediately after engine is returned to service.

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. SRT 14-701, Engine - Run-In and Test (Engine Dynamometer) provides the time

for this work. 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. SRT 14-702, Engine - Run-In and Test (Chassis Dynamometer), or SRT 14-703, Engine - Run-In and

Test (Load Bank or Portable Dynamometer), provide time for this work.

General Information Engine Testing

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CUMMINS N14 Specifications Page 442