Valve Clearance Adjustment - Robin DY23-2D Service Manual

5- 4- 11 VALVE CLEARANCE
ADJUSTMENT
(1) Set the crankshaft to the top dead
center by matching the mark "T" of the
flywheel with the
"TOP" mark of the
crankcase.
(2) Loosen the lock nut on the rocker arm
and turn the adjusting screw to adjust
the clearance between the rocker arm
and valve stem end to
0.1 mm.
(both intake and exhaust)
Then, tighten the lock nut.
Adjust the valve clearance while ' t h e
engine is cold.
(3) Turn the flywheel by hand and check
the valves move smoothly without
hitting piston.
FIG. 58
0
INTAKE, EXHAUST VALVE TIMING
The valve clearance shall increase to
0.4 mm while engine is running hot.
In this condition, the valve timing
is as
follows
:
Intake valve opens at 16" before TDC.
Intake valve closes at 5 4 " after BDC.
Exhaust valve opens at 54" before BDC.
Exhaust valve closes at
14" after TDC.
TDC (TOP DEAD CENTER)
INTAKE V A L V E 1 6 "
1 4 "
EXHAUST VALVE
(4)
Apply sealant (THREE BOND 1215) t o
the joining surface of the rocker cover.
I N T A K E V A L V E
CLOSES.
BDC (BOTTOM DEAD CENTER)
(5) Install the rocker cover and the gasket
(rocker cover) to the cylinder head.
FIG. 59
,
-
36
-