Care and Maintenance 7
TC29
71
7.9.7 Valve lash
• The valve lash (57/1) is tested with the engine
cold, by placing a reed gauge between the
upper part of the tappet (57/3) and the rocker
arm (57/2).
• The correct valve lash is as follows:
Inlet valve = 0.25 mm
Exhaust valve = 0.25 mm
Cylinder no. 1 is located on the front side
of the engine breather.
Firing sequence: 1 - 3 – 4 - 2
• Remove the valve cover.
• Turn the crankshaft clockwise until the valves
intersect at cylinder no. 1.
• The marking (57/6) on the housing and V-belt
pulley must be identical. Check the overlapping
of the valve by moving the crankshaft by
approx. 20° in both directions. The rocker arm
must not move.
• If the rocker arm moves, the crankshaft must
be turned further by one full turn (360°).
• In this position, check the valve lash of the
valves on cylinder no. 1.
If necessary, adjust the valve lash as follows:
⇒ Slacken the lock nut (57/4).
⇒ Using a screwdriver, adjust the setting screw
(57/5) in such a way that the correct valve lash
(57/1) is obtained when the lock nut is
tightened.
• To adjust the other cylinders, turn the
crankshaft further by 180° each time. Order of
adjustment = Firing sequence
• Check and adjust the valves in the same
manner as for cylinder no. 1.
• Re-fit the valve cover.
Fig. 57-Valve lash
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