Cooling & lubrication
Accessory drive belt
Transfers engine rotation to belt-driven accessories.
At the engine’s accessory drive end.
A tensioned ribbed belt follows pulleys for the accessories present on that engine.
A conveyor linking several pulleys.
Squeal, fraying or charging faults may arise from belt, tensioner, pulley or accessory issues.
Fluids use vehicle-specific schedules. Seals, pumps and heat exchangers depend on age, condition and operating history.
Simple seals and filters can be accessible; an integrated pump, buried housing or overheating damage can make repairs more involved.
A BMW accessory belt and its internal timing chain do different jobs.
BMW combustion models; additional coolant circuits also appear in hybrids and electric BMWs.
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