Install a vacuum gauge or water manometer into the exhaust air piping.

NOTE: The gauge adapter must be installed at a 90 degree angle to the air flow in a straight section of pipe, 127 mm [5 in], from the turbocharger turbine outlet.

Operate the engine at full throttle and at maximum horsepower RPM with maximum load, and record the manometer reading.

NOTE: Exhaust pressure must not exceed 1016 mm H₂0 [40 in H₂0]

If exhaust pressure exceeds the specifications, inspect the exhaust piping, muffler, and rain cap for damage and restrictions. Refer to the OEM service manual.

Remove the test equipment.