MTD Yard-Man YM26SS Manual Del Operador página 22

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SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel
unsure or unqualified to perform this, take the unit to an
authorized service center.
NOTE: Inspect the valve to rocker arm clearance with a
feeler gauge after the first 10 hours of operation
and then every 25 hours of operation thereafter.
• The engine must be cold when checking or adjusting
the valve clearance.
• This task should be performed inside, in a clean, dust
free area.
1. Remove the muffler cover by pressing down on the
corner with a flat blade screwdriver (Fig. 38). Slide
the notches on the sides of the muffler cover over
the tabs on the engine cover and remove
Engine Cover
Muffler Cover
2. Remove the two (2) screws on top of the engine
cover with an appropriate screwdriver (Fig. 39).
Top View Of The Engine
Engine Cover
Fig. 38
Remove Screws
Muffler
Fig. 39
3. Remove the screw behind the engine cover (Fig. 40).
4. Disconnect the spark plug wire.
5. Clean dirt from around the spark plug. Remove the
spark plug from the cylinder head by turning a 5/8 in.
socket counterclockwise.
6. Remove the engine cover (Fig. 39).
7. Clean dirt from around the rocker arm cover.
Remove the screw holding the rocker arm cover with
a large flat blade screwdriver or Torx T25 bit
(Fig. 41). Remove the rocker arm cover and gasket.
Rocker Arm Cover
Spark Plug Hole
8. Pull the starter rope slowly to bring the piston to the
top of its travel, (known as top dead center). Check
that:
• The piston is at the top of its travel while looking in
the spark plug hole (Fig. 41).
• Both rocker arms move freely, and both valves are
closed.
If not, repeat this step.
22
Screw
Fig. 40
Fig. 41

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