78
REGULAR MAINTENANCE
ENGLISH
h Valve clearance checkup/adjustment
The valve clearance should be checked every 2,000 hours or one year and perform the adjust-
ment if necessary.
When the rocker arm shaft(spindle) is removed due to a parts replacement, valve clearance
should be adjusted as well.
Valve clearance checkup/adjustment proceeds as follows.
Refer to the table below when preparing the tools and part required for the replacement/mainte-
nance.
Valve clearance adjustment
Stop the engine by controlled shutdown before the maintenance. (refer to 'Operation restriction
of the outdoor unit prior to maintenance' in the 'Self-diagnosis')
1) Rocker cover removal/ top dead center checking
- Remove the high-tension wires of all cylinders and the blow-by hose, and then open the
engine rocker cover. (size 12mm)
- Rotate the crank shaft pulley clockwise in order to position a far left groove from the crank
pulley grooves (F) inside a timing gear (E) of a front case. (Figure 1)
- When there is a gap between an air intake & the exhaust rocker arm (G) of #1 cylinder and a
valve cap, cylinder #1 is the compression top dead center. When there is a gap between the
air intake & exhaust rocker arm (H) of cylinder #4 and the valve cap, cylinder #4 is the com-
pression top dead center. Therefore, make sure to have the cylinder #1 be the compression
top dead center by rotating the crank pulley 1 full revolution.
CAUTION
• In order to cool down completely, stop the unit 1~2 hours prior to maintenance/replace-
ment. If you touch a heated area of the outdoor unit parts which was in operation, it may
cause burns.
• Make sure to shut off the power breaker of the outdoor control panel when performing
internal work on the outdoor unit. If the indoor unit is operated by the customer’s remote
control during internal work, it may cause injury or equipment damage.
• Use authentic products from LG electronics for the parts replacement. Use of inauthentic
parts or oil can cause malfunction of the unit and the customer will be responsible for any
damages involved.
!
Necessary parts
and tools
Specifications and
Stock No.
Quantity Remarks
THICKNESS GAUGE
0.3 ~ 0.25mm 1 0.25mm (in cold)
Socket wrench 10 ~ 19mm 1ea
Screwdriver 1SET
Torque wrench
2.9~9.8 N·m
9.8~44.1 N·m
1ea
Engine ignition plug replacement
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