Справочник Пользователя для Generac Power Systems 005240

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To adjust valve clearance (if necessary):

Make sure the engine is at 60° to 80° F.
Make sure that the spark plug wire is removed 

from the spark plug and out of the way.

Remove the four screws attaching the valve cover 

with a #2 or #3 Phillips screwdriver.

Loosen the rocker jam nut. Use an 10mm allen 

wrench to turn the pivot ball stud while checking 
clearance between the rocker arm and the valve 
stem with a feeler gauge. Correct clearance is 
0.002-0.004 inch (0.05-0.1 mm).

Jam Nut

Pivot Ball

Stud

Rocker 

Arm

Valve

Stem

NOTE:

Hold the rocker arm jam nut in place as the pivot 
ball stud is turned.

When valve clearance is correct, hold the pivot ball 
stud in place with the allen wrench and tighten the 
rocker arm jam nut. Tighten the jam nut to 174 
in/lbs. torque. After tightening the jam nut, recheck 
valve clearance to make sure it did not change.

Install new valve cover gasket.
Re-attach the valve cover.

NOTE:

Start all four screws before tightening or it will not 
be possible to get all the screws in place. Make 
sure the valve cover gasket is in place.

Install spark plugs.
Re-attach the spark plug wire to the spark plug.
On the GT-530 and GT-990, repeat the process for 

the other cylinder.

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Air inlet and outlet openings in the generator com-
partment must be open and unobstructed for con-
tinued proper operation. This includes such obstruc-
tions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the 
engine/generator quickly overheats, which causes it 
to quickly shut down. (See Figure 4.11 for vent loca-
tions.)

Make sure the doors and roof are in place dur-
ing operation as running the generator with them 
removed can effect cooling air movement.