Non-interference engines have valve clearances designed so that even if the timing belt breaks, the valves won't hit the pistons. This means less damage if the timing belt fails.
Interference engines have tighter valve clearances. If the timing belt breaks, the valves can collide with the pistons, resulting in significant engine damage.
Here's a breakdown of the E34 engines and their interference status:
Non-interference Engines:
* M20: This 6-cylinder engine, found in the E34 520i, 525i, and 530i, is non-interference.
Interference Engines:
* M50: This 6-cylinder engine, found in the E34 525i, 530i, and 535i, is interference.
* M50TU: The updated version of the M50 engine is also interference.
* M60: The V8 engine in the E34 540i is interference.
It's crucial to determine the specific engine in your E34 before making any assumptions about interference or non-interference. You can use your vehicle identification number (VIN) to confirm the engine type.
To be safe, it's always recommended to have the timing belt inspected and replaced at regular intervals, regardless of whether the engine is interference or non-interference. This will help prevent any potential issues and ensure the longevity of your engine.
