Engine Accessory Test

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.

Limit engine running time to one minute or less with belts removed or serious engine damage will result.

To carry out this test, proceed as follows:

NOTE: Use a frequency measurement tool to pinpoint accessory vibrations. A listening device, such as an EngineEAR, will also help to identify noises from specific accessories.

Remove the accessory drive belt(s).
Increase the engine rpm to where the symptom occurs.
If the vibration/noise is duplicated when carrying out this test, the belt(s) and accessories are not sources.
If the vibration/noise was not duplicated when carrying out this test, install the accessory belt(s), one at a time, to locate the source.
If the source of the symptom has been identified as a result of this test, proceed to the appropriate information for further diagnosis and repair. If the source has not been identified, continue with the road test.