Timing belts are typically only used on overhead camshaft engines. Timing belts are used to synchronize the crankshaft with the camshaft, similar to a timing chain on an overhead valve (pushrod) engine. Unlike a timing belt, a timing chain will normally last the life of the engine without needing service or replacement. Timing belts use raised teeth to mesh with sprockets to operate the valvetrain of an overhead camshaft engine.
Whenever a vehicle with an unknown service history comes into your repair facility or is recently purchased, here are some points that should be asked to help prevent costly engine damage:
* Does the owner know if, or when the belt was replaced-
* If the vehicle purchased is used, or the condition and mileage of the last timing belt replacement are unknown, it is recommended to inspect, replace or at least inform the owner that the vehicle is equipped with a timing belt.
* Note the mileage of the vehicle. The average replacement interval for a timing belt is approximately 60,000 miles (96,000 km).Inspection
Inspect the drive belt for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately.Removal & Installation
1. Raise and support the vehicle.
2. Remove the engine splash shield.
3. Rotate the drive belt tensioner clockwise to release the drive belt tension.
4. Remove the drive belt from the alternator.
5. Slowly release the drive belt tensioner.
6. Remove the drive belt from the accessory drive pulleys.
Fig. Accessory drive belt routing - 2.4L engines
1. Install the drive belt to the accessory drive pulley.
2. Rotate the drive belt tensioner clockwise.
3. Install the drive belt to the alternator.
4. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
5. Slowly release the drive belt tensioner
6. Install the engine splash shield.
7. Lower the vehicle.