Mechanical contamination indicator
49
After the air cleaner has been re-assembled, the
red zone „1“ visible in the maintenance indicator
must be cancelled by pressing reset knob „2“.
5.4.3. Checking and adjusting
valve clearances
– On the encapsulated engine, take off the
capsule hood (see Chapter 2).
– Unscrew the hex nuts and take off the cylinder
head cover (Figure 3, Item 13).
– Take off the covers for the air guide housing
and belt guard (see Chapter 2).
50
– Insert a ratchet wrench or a 1/2" T-piece with
the necessary extension into square hole „1“
(Figure 50).
Important !
Turn the engine over in the normal direction of
rotation.
This is counter-clockwise in either case – at the
flywheel or timing gear end.
Adjusting method for two-cylinder engines
51
– The valves in cylinder 1 (at the fan end) must
be in the overlap position (exhaust valve not
yet closed, inlet valve just starting to open).
– Turn the crankshaft through 180 degrees in the
normal direction of rotation, and check valve
clearances at cylinder 2.
– Turn the crankshaft a further 180 degrees in
the same direction as before, and check the
valve clearances at cylinder 1.
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