Inspect Belt Tensioner

IMPORTANT: Inspect all belt tensioner and pulley systems in this manner.

NOTE: Pulley and dust shield can be serviced separate from spring tensioner. Spring tensioner is serviced as an assembly.

a. Check to see if tensioning arm (A) is against free arm stops (B). Replace belt if this condition is seen.

b. Check belt tracking mark on the pulley. Replace belt tensioner if tracking mark is considerably wider than belt.

2. With belt OFF the drive, perform the following checks:

NOTE: Do not pry between pulley and spring case.

a. Release tension on belt using a long-handle 1/2 in. drive tool. Remove belt from alternator pulley.

b. Release tension on tension arm (A).

c. Rotate tension arm (A) slowly using a 1/2 in. drive tool. Arm should rotate smoothly between arm stops (B); if not, replace tensioner.

d. Replace tension mechanism if there is:

• Metal-to-metal contact is present between rotating and stationary parts at location (C and D) on tensioner.
• Cracks or broken spring case or broken stops.

3. Apply thread lock and sealer to cap screw and install belt tensioner in engine front cover at mounting hole. Tighten to specification.

A-Tension Arm
B-Free Arm Stops
C-Metal-to-Metal Contact Between Arm and Spring Case
D-Metal-to-Metal Contact Between Arm and End Cap

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Specification

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