Daikin GYEQ20AN Service Manual page 229

SiAUY361411EA
5
Adjusting the valve clearance
Part name
Tools/materials Plug wrench, offset wrench, slotted screwdriver, thickness gauge, waste cloth
Step
(1) See "Basics" (page 213)
(2) Remove the spark plug See "Replacing the spark plug."
(3) Remove the bonnet
(4) Set the piston in cylin-
der NO1 to the com-
pression top dead
center
(5) Check the current
clearance
(6) Adjust the clearance
(7) Set the piston to the
compression top dead
center for cylinder NO2
and onward
(8) Perform a post-adjust-
ment check
(9) Install the bonnet
(10) Install the spark plug
Feeler gauge
Maintenance / Service Data
1. Caution: The parts remain hot for some time after stopping the
engine.
2. Remove the breather hose.
3. Loosen and remove the bonnet cover mounting bolt.
Turn the crank shaft via the pulley until the piston reaches the compression
top dead center.
• Cylinder NO1 is the leftmost cylinder when viewed from the
maintenance side (flywheel side).
• Turn the crank shaft counterclockwise (when viewed from the
flywheel side).
1. Move the valve up/down by hand.
2. Use a thickness gauge to measure the clearance.
1. Loosen the lock nut.
2. Use the adjuster screw to adjust the clearance.
• Standard valve clearance value (for both intake and exhaust
valves): 0.3±0.05 mm
3. Tighten the lock nut.
For every cylinder from the second onward, repeat step 5.
Recheck the valve clearance after adjustment.
1. Tighten the bonnet mounting bolt.
2. Install the breather hose.
See page 217 [Replacing the spark plug].
Lock nut
Adjusting
screw
020934-00E
Task
Valve rocker arm
Valve
clearance
Maintenance
Remarks
To facilitate turning the
crank shaft.
• Prevent burns.
• Remove the hose from
the breather cap.
• Take care not to
damage the rubber
packing when removing
the bonnet.
You can determine whether
the compression top dead
center is reached based on
the fact that the intake/
exhaust valve adjusters
have a play when the piston
is at the top dead center.
• Wipe off oil from the
portion to inspect, and
measure the clearance
using a thickness gauge.
• Do not attempt to forcibly
insert the thickness
gauge when measuring
the clearance.
• Fasten so that the
adjuster screw does not
move.
• Take care not to detach or
damage the packing when
installing the bonnet.
Adjustment screw
Lock nut
010612-01E
218