Maintenance, Warning – LEHR Eco Trimmer User Manual

Page 18

LEHR

Fig.43

Rocker Arm

Cover

Rocker Arm Cover

Screws

8. Pull the starter rope slowly to bring the piston to

the top of its travel, (This position is known as top

dead center).Check that the piston is at the top of

its travel by looking down into the spark plug hole.

Both valves should be closed and the rocker arms

should move freely. If this statement is not true,

repeat this step.

9. Slide a feeler gage between the rocker arm and the

valve return spring. Measure the distance between

the rocker arm and valve stem (Fig. 44) Take care

to only measure the free play. It is very easy to

insert too thick a feeler gauge and accidentally

depress the valve and spring. Measure both the

intake and exhaust valve distances.

10. Check the spark plug and reinstall (See Replacing

the Spark Plug (p.14).

11. Reinstall the spark plug wire.

Jam Nuts

Adjusting Screws

Rocker Arm

Feeler Gauge

Exhaust Valve

Intake Valve

Fig.44

IF THE CLEARANCE IS NOT WITHIN SPECIFICATION

1. Loosen the jam nut and turn the adjusting screw

as necessary. To increase the clearance, turn the

adjusting screw CCW. To decrease the clearance,

turn the adjusting screw CW.

2. Tighten the jam nut when the clearance is set.
3. Recheck the both clearances. Readjust if necessary.
4. Reinstall the rocker arm cover using a new gasket.
5. Tighten cover screws evenly until snug.
6. Reinstall the engine cover checking the alignment of

the cover. Tighten the four engine cover screws until

snug.

• The recommended clearance for both intake and

exhaust is 0.076-0.152mm (0.003-0.006in).

• Use a standard automotive 0.127mm (0.005in) feeler gage.

WARNING:

ROCKER ARM CLEARANCE ADJUSTMENT

5. Clean dirt from around the rocker arm cover.
6. Remove the three screws holding the rocker arm

cover with a phillips head screwdriver.

7. Remove the rocker arm cover and gasket (Fig. 43).

MAINTENANCE

TO PREVENT SERIOUS INJURY, NEVER PERFORM
MAINTENANCE OR REPAIRS WITH UNIT RUNNING.
ALWAYS SERVICE AND REPAIR A COOL UNIT. DISCON-
NECT THE SPARK PLUG WIRE TO ENSURE THAT THE
UNIT CANNOT START.