გაზგამანაწილებელი ჯაჭვი

Inside the timing cover; front or rear location depends on engine.

Sprockets, guides and a tensioning system maintain the designed timing relationship.

A chain linking two clocks so they stay in step.

Rattle or timing correlation faults may involve chain wear, tension or lubrication.

Usually condition-based rather than a routine replacement. Lubrication, overheating and the exact engine affect wear.

Internal-engine work is usually labor-intensive. Diagnosis and the engine code determine the repair scope.

BMW petrol and diesel engines; petrol-only systems are identified individually.