Measure the exhaust air restriction. Install the vacuum gauge, Part No. ST-1273, or a manometer in the exhaust
air piping.
NOTE: The gauge adapter must be installed near the turbocharger in a straight section of pipe at the turbine outlet.
Operate the engine at maximum horsepower RPM and advertised horsepower.
Observe the gauge or manometer.
NOTE: Pressure must not exceed 75 mm Hg [3.0 inches Hg].
