If the timing belt breaks on an interference engine:
* Bent valves: This is the most common and significant damage. The valves will likely be bent because the pistons will strike them as they continue their up-and-down motion without the proper timing synchronization provided by the belt. Repairing this involves removing the cylinder head, replacing bent valves, and potentially repairing or replacing other components damaged in the process.
* Damaged pistons: In severe cases, the pistons themselves might be damaged from the collision with the valves. This damage can range from minor scratches to significant holes, requiring piston replacement.
* Damaged cylinder head: The force of the collision can crack or warp the cylinder head, requiring repair or replacement. This is a very expensive repair.
* Broken piston rings: The impact can also damage or break piston rings, leading to further engine problems.
* Potential crankshaft damage: While less common, the crankshaft could suffer damage from the force of the broken belt and the resulting piston/valve collision.
In summary: A snapped timing belt on a Ford Transit diesel is a serious event leading to significant and expensive engine damage. It usually requires a major engine rebuild or even engine replacement, depending on the extent of the damage. The cost to repair can easily reach thousands of dollars.
Non-interference engines are less likely to suffer valve damage, but other components might still be affected (e.g., damaged crankshaft sensor). However, even in this less damaging scenario, it's crucial to replace the timing belt immediately and to inspect the engine thoroughly.
It's vital to replace the timing belt according to the manufacturer's recommended interval. This preventative maintenance is far cheaper than the cost of fixing the consequences of a broken belt.
