Engine internals
როლიკებიანი კოჭა
Transfers cam-lobe motion to the valve.
Between each cam lobe and valve in the cylinder head.
A roller rides on the lobe while one end pivots on a lash adjuster and the other presses the valve stem.
A see-saw that turns a push into a nudge.
Ticking from the top of the engine may involve followers, adjusters or oil supply.
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.
Valvetronic BMW engines add an intermediate lever above the follower to vary intake valve lift.
BMW petrol and diesel engines; petrol-only systems are identified individually.
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