Accessory Drive System: Other Ford Econoline E150

Drive Belt Tensioner - Automatic

The drive belt tensioner will maintain correct belt tension if the correct length drive belt is on the engine. To verify that the drive belt tensioner is working correctly, check to see that the belt length indicator mark on the drive belt tensioner is between the minimum and maximum marks. Remove the drive belt and rotate the tensioner to verify that the tensioner does not stick, grab or bind. If the tensioner exhibits any of these conditions, install a new tensioner.

Scheme 24

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 «DESCRIPTION AND OPERATION»(ref-234567-S18733816422006061100000) .
2. Using a suitable, commercially available serpentine belt tensioner release tool, release the tension on the belt and detach the accessory drive belt in the area of the tensioner.
3. Using a suitable, commercially available serpentine belt tensioner 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.
4. Rotate the tensioner pulley by hand and check for a binding, contaminated or seized condition. Install a new accessory drive belt tensioner if necessary.
5. Inspect the area surrounding the accessory drive belt tensioner for oil leaks or contamination and repair any leaks. Install a new accessory drive belt tensioner as necessary.
6. If the accessory drive belt tensioner meets the above criteria, proceed to testing the tensioner dynamically. If the accessory drive belt tensioner does not meet the above criteria, install a new tensioner.

Belt Tensioner - Dynamics

The accessory drive belt tensioner can be checked dynamically as follows

1. With the engine running, observe the accessory drive belt tensioner movement. The accessory drive tensioner should move (respond) when the air conditioning clutch cycles (if equipped), or when the engine is accelerated rapidly. If the accessory drive belt tensioner movement is excessive without air conditioning clutch cycling or engine acceleration, check belt rideout. Excessive belt rideout (uneven depth of grooves in the belt) can cause excessive accessory drive belt tensioner movement. Check rideout condition by installing a new belt. If excessive accessory drive belt tensioner movement still exists, install a new accessory drive belt tensioner.

Scheme 25

1. Remove the air cleaner assembly. For additional information, refer to «INTAKE AIR DISTRIBUTION & FILTERING»(ref-210150) .
2. Rotate the tensioner clockwise and remove the drive belt.
3. To install, reverse the removal procedure. For additional information, refer to «ACCESSORY DRIVE (DRIVE BELT ROUTING - 4.6L, 5.4L, 6.8L WITH A/C»(ref-234567-S09248162352006061100000) ).

Scheme 26

1. Remove the air cleaner assembly. For additional information, refer to «INTAKE AIR DISTRIBUTION & FILTERING»(ref-210150) .
2. Rotate the tensioner counterclockwise and remove the drive belt.
3. To install, reverse the removal procedure. For additional information, refer to «ACCESSORY DRIVE (DRIVE BELT ROUTING - 4.6L, 5.4L, 6.8L WITH A/C»(ref-234567-S09248162352006061100000) ).