Engine Accessory Test
To carry out this test, proceed as follows:
WARNING:
- Block the front and rear wheels, and apply the parking brake and the service brake, or injury to personnel can result.
CAUTION:
- Limit engine running time to one minute or less with belts removed or serious engine damage will result.
NOTE:
- A serpentine drive belt decreases the usefulness of this test. In these cases, use a vibration analyzer, such as the EVA, to pinpoint accessory vibrations. An electronic listening device, such as an EngineEAR PROBE, will also help to identify noises from specific accessories.
- Remove the accessory drive belts.
- Increase the engine RPM to where the concern occurs.
- If the vibration/noise is duplicated when carrying out this test, the belts and accessories are not sources.
- If the vibration/noise was not duplicated when carrying out this test, install each accessory belt, one at a time, to locate the source.