Valve Clearance Adjustment; Check Valve Clearance; Adjust Valve Clearance - Generac GH-410 Manual Del Propietário

Section 4: Maintenance
Clean the plug(s) by scraping or washing with a
4.
wire brush and commercial solvent. Do not blast
the plug(s) to clean.
Check the spark plug gap using a wire feeler
5.
gauge. See Figure
specification, replace the spark plug. See Section 2
Specifications.
Figure 4-3. Spark Plug Gap Adjustment

Valve Clearance Adjustment

Check the valve clearance after the first 25 hours of
operation, then after 400 hour intervals. Adjust if
necessary.
Important: Please contact an Independent Authorized
Service Dealer for service assistance. Proper valve
clearance is essential for prolonging the life of the
engine.
B
A
Figure 4-4. Valve Clearance Adjustment

Check Valve Clearance

•
The engine should be cool before checking.
Adjustment is not needed if valve clearance is
within the specification
Specifications.
20
4-3. If the gap is out of
000211
C
D
000602
in Section
•
Remove spark plug wires and position wires away
from plugs.
•
Remove spark plugs.
•
Make sure the piston is at top dead center (TDC) of
its compression stroke (both valves closed). To get
the piston at TDC, remove the intake screen at the
front of the engine to gain access to the flywheel
nut. Use a large socket and socket wrench to
rotate the nut and hence the engine in a clockwise
direction. While watching the piston through the
spark plug hole. The piston should move up and
down. The piston is at TDC when it is at its highest
point of travel.

Adjust Valve Clearance

See Figure 4-4:
•
The engine should be cool before adjustment.
•
Remove spark plug wires and position wires away
from plugs.
•
Remove spark plugs.
•
Remove the four screws attaching the valve cover.
Remove and discard gasket.
•
Loosen the rocker jam nut (A) using a 10mm Allen
or 13mm Allen wrench.
•
Turn the pivot ball stud (B) while checking
clearance between the rocker arm (C) and the
valve stem (D) with a feeler gauge. Correct
clearance is in the specification in Section 2
Specifications.
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 (19.68 Nm) torque. After tightening the jam nut,
recheck valve clearance to make sure it did not
change.
•
Install new valve cover gasket.
•
Install the valve cover. Tighten fasteners in a cross
pattern, torquing to 48 in-lbs (5.4 Nm).
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.
•
Repeat the process for the other cylinder, if
necessary.
2
Owner's Manual for 60 Hz Air-cooled Generators