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Between each piston pin and crankshaft journal.

The small end pivots at the piston and the big end rotates around a lubricated crank journal.

The link between a pedal and a bicycle crank.

Deep knocking or metal in oil demands diagnosis; running the engine can worsen damage.

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.