Install a vacuum gauge or water manometer in the intake air piping.
The gauge adapter must be installed at a 90-degree angle to the airflow in a straight section of pipe, one pipe
diameter before the turbocharger.
NOTE: On many applications, the air intake restriction can be measured by removing the pop-up flag restriction
gauge and installing a vacuum gauge or water manometer.
Operate the engine at rated speed and load.
Record the data on the gauge or manometer.
If restriction exceeds specifications, replace or clean the air filter element. Refer to the equipment manufacturer’s
instructions.
Inspect the intake piping for damage. Refer to the equipment manufacturer’s repair instructions.
Remove the test equipment.
