Drive Belt Tensioner

OPERATION The automatic belt tensioner maintains correct belt tension using a coiled spring within the tensioner housing. The spring applies pressure to the tensioner arm pressing the arm into the belt, tensioning the belt. If a new belt is being installed, the arrow must be within approximately 3 mm (1/8 in.) of indexing mark. Belt is considered new if it has been used 15 minutes or less. If this specification cannot be met, check for: -The wrong belt being installed (incorrect length/width) -Worn bearings on an engine accessory (A/C compressor, power steering pump, water pump, idler pulley or generator) -A pulley on an engine accessory being loose -Misalignment of an engine accessory -Belt incorrectly routed.

The automatic belt tensioner is a spring loaded arm and pulley assembly. The tensioner assembly is designed to apply constant pressure on the accessory drive belt to maintain proper belt tension.

WARNING: The automatic belt tensioner assembly is spring loaded. Do not attempt to disassemble the tensioner assembly.

The automatic belt tensioner maintains correct belt tension using a coiled spring within the tensioner housing. The spring applies pressure to the tensioner arm pressing the arm into the belt, tensioning the belt.

If a new belt is being installed, the arrow must be within approximately 3 mm (1/8 in.) of indexing mark. Belt is considered new if it has been used 15 minutes or less. If this specification cannot be met, check for:

The wrong belt being installed (incorrect length/width) Worn bearings on an engine accessory (A/C compressor, power steering pump, water pump, idler pulley or generator) A pulley on an engine accessory being loose Misalignment of an engine accessory Belt incorrectly routed.

1. Disconnect negative battery cable. 2. Remove accessory drive belt (9). See Fig. 25. See BELT-ACCESSORY DRIVE.

3. Remove belt tensioner retaining bolt and remove tensioner (1).

1 - TIMING CHAIN COVER 2 - BOLT TORQUE TO 41 N.m (30 FT LBS) 3 - AUTOMATIC BELT TENSIONER

1. Remove accessory drive belt (Refer to BELT-ACCESSORY DRIVE ). 2. Remove tensioner assembly (3) from engine front cover.

WARNING: Because of high spring tension, do not attempt to disassemble automatic tensioner. Unit is serviced as an assembly (except for pulley on tensioner).

3. Remove pulley bolt. Remove pulley from tensioner.

1 - IDLER PULLEY 2 - ACCESSORY DRIVE BELT TENSIONER 3 - MOUNTING BOLT

1. Remove accessory drive belt. See BELT-ACCESSORY DRIVE. 2. Remove accessory drive belt tensioner.

1 - ACCESSORY BELT TENSIONER RETAINING BOLT 2 - POWER STEERING PUMP PULLEY 3 - BELT TENSIONER 4 - BRACKET 5 - POWER STEERING PUMP 6 - POWER STEERING PUMP RETAINING BOLTS 7 - POWER STEERING PUMP PULLEY RETAINING BOLTS

1. Install belt tensioner on bracket. Tighten retaining bolt to 47 N.m (35 ft. lbs.).

1 - IDLER PULLEY 2 - GENERATOR

3 - IDLER PULLEY 4 - A/C COMPRESSOR 5 - COOLING FAN SUPPORT 6 - VIBRATION DAMPER 7 - BELT TENSIONER 8 - POWER STEERING PUMP 9 - ACCESSORY DRIVE BELT 10 - VISCOUS HEATER

2. Install accessory drive belt. See INSTALLATION. 3. Connect negative battery cable.

1 - TIMING CHAIN COVER 2 - BOLT TORQUE TO 41 N.m (30 FT LBS) 3 - AUTOMATIC BELT TENSIONER

1. Install pulley and pulley bolt to tensioner. Tighten bolt to 61 N.m (45 ft. lbs.) torque. 2. An indexing slot is located on back of tensioner. Align this slot to the head of the bolt on the front cover. Install the mounting bolt. Tighten bolt to 41 N.m (30 ft. lbs.). 3. Install drive belt (Refer to INSTALLATION). 4. Check belt indexing marks (Refer to INSTALLATION).

1 - IDLER PULLEY 2 - ACCESSORY DRIVE BELT TENSIONER 3 - MOUNTING BOLT

1. Position accessory drive belt tensioner (2). 2. Install mounting bolt (3). Tighten bolt to Tighten bolt to 61 N.m (45 ft. lbs.). 3. Install accessory drive belt. See INSTALLATION.

PULLEY-IDLER