Technical Information 08.2005
Page 15
TI_08_2005_11_01_02.fm
5.4.3
Determine top dead centre
.
Rotate the crankshaft until the tip of the flywheel
(
arrow
) is flush with the ignition coil as shown
The piston is now at the top dead centre, valve
overlap,
or
in top dead centre, ignition.
.
Turn the crankshaft back and forth a few
degrees – if the rocker arms and valve stems
move up and down (see
arrows
), the piston is in
the
top dead centre for valve overlap
.
Rotate the crankshaft
once
more until the tip of
the flywheel is flush with the ignition coil.
Rocker arms and valve stems do not move and the
piston is now in the
top dead centre for ignition
.
.
Turn the crankshaft back anticlockwise
approx.1/4 turn and then slowly turn it clockwise
again until the tip of the flywheel is lined up with
the ignition coil.
The crankshaft must be turned backwards in order
to eliminate the flank backlash from the timing gear.
5.4.4
Check valve clearance
The cam disk cover must be installed to
"Check the
valve clearance“
and
"Set the valve clearance“
.
.
Insert setting gauge (
1
) between rocker arm (
2
)
and valve stem (
3
) – the setting gauge must
produce a
slight suction
effect when it is pulled
through
The valve clearance must be adjusted if it is found
to be too large or too small.