10. Intake Restriction Test
10. INTAKE RESTRICTION TESTPurpose:
This purpose of this test is verify an intake air or exhaust restriction is not contributing to a low power condition. If the engine does have a high intake air restriction, a considerable amount of black or blue smoke may be produced.
Intake Restriction
- Check air filter restriction gauge and indicator.
- Measure the vacuum on clean side of intake air system at wide open throttle (WOT) with a Magnehelic Gauge(R) 0-60 in-H20 Bar (part of DSL ENG Pressure Test Kit 014-00761 or equivalent).
Recommended Procedure:
Inspect the air cleaner inlet and ducting to make sure it is not blocked or collapsed. Inspect the air cleaner housing and filter for proper installation.
Inspect for any indication of water intrusion into air cleaner and filter.
If necessary, use DSL ENG Pressure Test Kit 014-00761 or equivalent to install a Magnehelic Gauge(R) on the port on the air cleaner and measure restriction at high idle.
Air Filter Restriction Gauge:
Possible Causes:
- Snow 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 Gauge(R) 0-60 in-H20 Bar (part of DSL ENG Pressure Test kit 014-00761 or equivalent)