Accessory belt replacement-4.7L engine. Automatic belt tensioner-5.2L/5.9L engine

Accessory belt replacement-4.7L engine

NOTE: The belt routing schematics are published from the latest information available at the time of publication. If anything differs between these schematics and the Belt Routing Label, use the schematics on Belt Routing Label. This label is located in the engine compartment.

REMOVAL

CAUTION: DO NOT LET TENSIONER ARM SNAP BACK TO THE FREEARM POSITION, SEVER DAMAGE MAY OCCUR TO THE TENSIONER.

Belt tension is not adjustable. Belt adjustment is maintained by an automatic ( spring load ) belt tensioner.

(1) Disconnect negative battery cable from battery.

(2) Rotate belt tensioner until it contacts it's stop.

Remove belt, then slowly rotate the tensioner into the freearm position. (Fig. 59).

Fig. 59 Belt Routing-4.7L

1 - GENERATOR PULLEY

2 - ACCESSORY DRIVE BELT

3 - POWER STEERING PUMP PULLEY

4 - CRANKSHAFT PULLEY

5 - IDLER PULLEY

6 - TENSIONER

7 - A/C COMPRESSOR PULLEY

8 - WATER PUMP PULLEY

INSTALLATION

Belt tension is not adjustable. Belt adjustment is maintained by an automatic ( spring load ) belt tensioner.

(1) Check condition of all pulleys.

CAUTION: When installing the serpentine accessory drive belt, the belt MUST be routed correctly. If not, the engine may overheat due to the water pump rotating in the wrong direction (Fig. 59).

(2) Install new belt (Fig. 59). Route the belt around all pulleys except the idler pulley. Rotate the tensioner arm until it contacts it's stop position.

Route the belt around the idler and slowly let the tensioner rotate into the belt. Make sure the belt is seated onto all pulleys.

(3) With the drive belt installed, inspect the belt wear indicator (Fig. 60). On 4.7L Engines only, the gap between the tang and the housing stop ( measurement A ) must not exceed 24 mm (.94 inches). If the measurement exceedes this specification replace the serpentine accessory drive belt.

Fig. 60 Accessory Drive Belt Wear Indicator-4.7L Engine

1 - AUTOMATIC TENSIONER ASSEMBLY

Automatic belt tensioner-5.2L/5.9L engine

REMOVAL

(1) Remove accessory drive belt.

(2) Disconnect wiring and secondary cable from ignition coil.

(3) Remove two mounting bolts and ignition coil from engine (Fig. 61).

(4) Remove mounting bolt and tensioner assembly from engine (Fig. 61).

WARNING: BECAUSE OF HIGH SPRING PRESSURE, DO NOT ATTEMPT TO DISASSEMBLE AUTOMATIC TENSIONER. UNIT IS SERVICED AS AN ASSEMBLY (EXCEPT FOR PULLEY).

(5) Remove pulley bolt. Remove pulley from tensioner.

INSTALLATION

(1) Install pulley and pulley bolt to tensioner.

Tighten bolt to 61 N*m (45 ft. lbs.).

(2) Position tensioner assembly and install mounting screw tighten screw to 67 N*m (50 ft. lbs.).

Fig. 61 Automatic Belt Tensioner Removal/ Installation 5.2L/5.9L Engines

1 - AUTOMATIC TENSIONER

2 - COIL AND BRACKET

3 - SCREW AND WASHER

(3) Connect all wiring to ignition coil.

(4) Position coil to tensioner assembly, install two mounting screws. Tighten to 11 N*m (100 in. lbs.) (Fig. 61).

CAUTION: To prevent damage to coil case, coil mounting bolts must be torqued.

(5) Install accessory drive belt.