F 350 2WD Super Duty V10-6.8L (2009)
Drive Belt Tensioner: Testing and Inspection
Belt Tensioner - Mechanical
Accessory Drive
Component Tests
Belt Tensioner - Mechanical
The only mechanical check that needs to be made is a check for tensioner stick, grab or bind.
1. With the engine off, check routing of the accessory drive belt. Refer to the illustrations under Accessory Drive See: Description and Operation in
the Description and Operation.
2. NOTE: The accessory drive belt tensioner spring is very strong and requires substantial force to release.
Using a suitable, commercially available serpentine belt tensioner release tool, release the tension on the belt and detach the accessory drive belt
from the tensioner. Carry out the following tests:
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Using the release tool, move the tensioner from its relaxed position, through its full stroke and back to the relaxed position to make sure there
is no stick, grab or bind, and to make sure that there is tension on the tensioner spring.
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Rotate the tensioner pulley by hand and check for a binding, contaminated or seized condition.
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Inspect the area surrounding the accessory drive belt tensioner for oil leaks or contamination and repair any leaks.
3. If the accessory drive belt tensioner does not meet the criteria in the previous step, install a new tensioner. If the accessory drive belt tensioner
meets the criteria in the previous step, proceed to testing the tensioner dynamically.
4. If the tensioner is saturated with oil and grease internally, install a new tensioner.
