MTD BCR4 - Manual (Page 20)

FIGURE 27
MAINTENANCE & REPAIR INSTRUCTIONS
20
Remove
Screws
Back of Engine
Loosen
Screws
Remove Screw
Rocker Arm Cover
Spark Plug
Hole
1. Loosen the four (4) screws shown in Figure 27.
2. Remove the three (3) screws that secure the
engine cover, visible in Figures 27 and 28.
3. Disconnect the spark plug wire.
4. Remove the spark plug.
5. Remove the engine cover.
Engine
Cover
7. Pull the starter rope slowly to bring the piston to
the top of its travel, (known as top dead center).
Check that:
• While looking in the spark plug hole, the piston is
at the top of its travel. See Figure 29.
• Both rocker arms move freely, and both valves are
closed.
If not, repeat this step.
8. Slide the feeler gauge between the rocker arm and
the valve return spring. Measure the clearance
between the valve stem and rocker arm. Measure
both the intake and exhaust valves. See Figure 30.
The recommended clearance for both intake and
exhaust is .076 – 0.152 mm (.003 – .006 in.). Use a
standard automotive 0.127 mm (.005 in.) feeler gauge.
The feeler gauge should slide between the rocker arm
and valve stem with a slight amount of resistance,
without binding. See Figure 30.
FIGURE 28
6. Clean dirt from around the rocker arm cover. Then
remove the screw holding the rocker arm cover
with a large flat blade screwdriver or Torx T25 bit.
Remove the rocker arm cover and gasket. See
Figure 29.
FIGURE 29
10. If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm)
wrench or nut driver. See Figure 30.
• To increase clearance, turn the adjusting nut
counterclockwise.
• To decrease clearance, turn the adjusting nut
clockwise.
b. Recheck both clearances, and adjust as necessary .
11. Reinstall the rocker arm cover using a new gasket.
Torque the screw to 2.2–3.4 N
•
m (20–30 in
•
lb).
NOTE: You can purchase a rocker arm cover gasket
from your local authorized dealer.
12. Reinstall the engine cover. Check alignment of the
cover before tightening the screws. Tighten screws.
14. Check the spark plug and reinstall. Refer to
Replacing the Spark Plug.
15. Replace the spark plug wire.
Adjusting Nut
Feeler
Gauge
Rocker Arm
Gasket
FIGURE 30