83
Operating Manual Crawler Excavator TC37
Care and Maintenance
7
7.8.7
Valve lash
• Test the valve lash (54/1) on a cold engine by
placing a feeler gauge between the upper part of
the tappet (54/3) and the rocker arm (54/2).
• Remove the valve cover
• Turn the crankshaft clockwise until the valves
intersect at the
1st cylinder
.
• The markings (54/6) on the housing and V-belt
pulley must coincide. 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 the 1st cylinder.
• To adjust the other cylinders, turn the crankshaft
further by 180° in each case.
Order of adjustment = firing sequence
• Check and adjust the valves as specified for the
1st cylinder.
• Re-install the valve cover.
Fig. 54
Adjusting the valve lash
HR1258
4
5
6
3
1
2
The correct valve lash is as follows:
Inlet valve
= 0.010 in
Exhaust valve
= 0.010 in
Attention
The 1st cylinder is located at the front on the
fan side of the engine.
Firing sequence: 1 – 3 – 2
Attention
If necessary, adjust the valve lash as follows:
• Slacken lock nut (54/4).
• Using a screwdriver, adjust the setting
screw (54/5) in such a way that the correct
valve lash (54/1) is obtained after the lock
nut is tightened.
