Engine Run-In Procedure - Engine Dynamometer (14-02) Section 14 - Engine Testing - Group 14 M11 Page 14-34 It is a good practice to observe these measurements even if engine performance meets specifications. If engine per- formance does not meet specifications, these measure- ments can indicate possible reasons for underperformance. The measurements taken are: Fuel inlet restriction at fuel pump inlet Fuel temperature Exhaust system back pressure Air inlet restriction pressure Fuel drain pressure Coolant pressure Oil patch test Compulink™for CELECT™equipped engines Obtain the CPL number from the engine data plate and the fuel pump code from the fuel pump data plate.
Engine performance specifications and fuel system calibration values for specific engine CPL and fuel pump codes are listed in the following publications: 1. Fuel Pump Calibration Values, Bulletin No. 3379352. 2. Injector Parts Flow and Cross Reference, Bulletin No. 3379664. 3. Engine Data Sheets. If a sudden increase in blowby occurs, or if blowby ex- ceeds the maximum allowable limit during any run-in step, return to the previous step and continue the run-in. If blowby does not reach an acceptable level during the next step, discontinue the run-in and determine the cause. Do not proceed to the next step until a steady blowby reading is obtained. NOTE:
Blowby must be measured by using Service Tool, Part No. 3375150 or 3822566, with manometer, Part No. ST-1111-3, or equivalent. Service Tool, Part No. 3375150, as shown, utilizes a chamfered 7.67 mm [0.302 inch] orifice. Start the engine. Move the throttle to obtain 1200 RPM engine speed, and apply a test load sufficient to develop 25 percent fuel rate. Operate the engine at this speed and load level until the coolant temperature is 70°C [160°F]. Check all gauges and record the data.