4 - Intake Restriction

4. Intake Restriction







Purpose:
This is a visual inspection to determine if an air intake restriction is contributing to a low power condition. If the engine does have a high air intake restriction, a considerable amount of black or blue smoke may be produced.

Recommended Procedure:






Inspect the air cleaner inlet and ducting to assure that it is not blocked or collapsed. Inspect the air cleaner housing and filter for proper installation.






If necessary, use Pressure Adapter Kit 014-00761 or equivalent to install a Magnehelic (R) gauge on the port on the air cleaner and measure restriction at high idle.

Possible Causes:
- Snow, plastic bags or other foreign material may restrict airflow at the air inlet.
- Misrouted air cleaner ducting.
- On engines recently repaired, rags or cap plugs may have been inadvertently left in an air inlet pipe.

Tools Required:
Magnehelic (Del) gauge (part of Pressure Adapter Kit 014-00761 or equivalent)