Engines Powertrain
Valve Actuation
• The camshafts actuate the valves via mechanical bucket tappets without adjustment
shims.
• The valve clearance is adjusted by the different thickness of the bucket tappets. The
tappet thickness can be determined by the engraved number (e.g. number “402” means
a thickness of 3.402 mm). In order to replace the tappets the camshafts have to be
removed (refer to the workshop manual for details).
• The valve clearance has to be audibly inspected (and if noisy adjusted) every 120,000
km.
L1001.4_01009
1 Camshaft 4 Tappet thickness
2 Tappet cross-sectional view 5 Valve stem contact surface
3 Cam lobe contact surface 6 Bucket tappet
01-14 Curriculum Training
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