Replacing the timing belt cover is required in the following cases:
- Damage or cracks: If there are visible cracks, chips or other mechanical damage, the cover must be replaced to maintain protection of the timing belt and associated components.
- Poor fit or retention: If the cover does not fit snugly or securely, it can allow dirt and water to get inside, increasing the risk of timing belt damage.
- Timing Belt Replacement: When replacing a timing belt, it may be wise to replace the cover, especially if it is old or showing signs of wear, to ensure maximum protection for the new belt.
- Worn seals: If the cover sealing elements are damaged or worn, oil or other fluids may leak, which can damage the timing belt.
- Damage during Removal: The cover and cover fasteners may be damaged during removal and may require replacement of the entire cover to ensure proper attachment.
- Leaks and Damage: Timing covers are also used in engines with timing chains. They can become damaged due to corrosion and cavitation, as well as gasket wear. In some cases, the chain can even wear through the cover. Damage to the timing cover can cause oil and coolant leaks, especially if the water pump is mounted on the cover and coolant passages run through it.
Replacing the timing belt cover helps maintain proper timing and longevity by preventing foreign objects and contaminants from getting inside.