Engine internals
Piston pin
Joins the piston to the small end of the connecting rod.
Through the piston bosses and the rod’s small end.
A hardened, polished tube lets the rod swing while carrying the full combustion load; clips or a press fit locate it.
The hinge pin in a door.
A light, rhythmic knock that changes with load can point to pin clearance but needs professional diagnosis.
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.
High-revving BMW M engines use short, light pins to keep reciprocating mass down.
BMW petrol and diesel engines; petrol-only systems are identified individually.
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