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MIKRON III A
MAINTENANCE
21
7.3. Valve Clearance Adjustment
Valve clearance adjustment
is carried out on cold
engine and both the
inlet and
exhaust valve clearances
are adjusted to
0.1 mm. The valve
clearance is measured by a feeler gauge between the valve and the valve
rocker
roller
ter
the cover
of the
valve rocker
compartment was
removed. Valve
earance adjustment is
carri
out, with the piston of
the corresponding
cylinder in its
top dead centre
of the compression
stroke, or according to the valve overlap, as
lows:
- Start with the
cylinder No. 1 (valve overlap
cylinder NO.4) and
then proceed
in accordance with
the firing
each time turning
the crankshaft
by 180 deg. in
the sence of
rotation, i.e. cylinder
NO.3
(NO. 2 cylinder
valve overlap),
then
inder
NO.4
(No. 1
cylinder valve
overlap) and finally
cylinder No. 2
(No.3 cylinder
valve overlap) .
The
feeler
gauge
should
fit
without
any
play,
but should not be
clamped.
Clearance
adjustment is
accomplished
after
loosening
the
lock
nuts.
The
completing the adjustment.
by
lo
me
ck
ans
nuts
adjustment screws
are tightened after
7.4. Adjustment of Ignition Timing
The ignition
spark advance
magnetos used
control.
on
the engine are
fit
with centrifugal
Basic advanced ignition timing carry out after adjusting breaker
contact gap within 0.30 - 0.40 mm by Scintilla magneto or 0.25 - 0.35 mm
by LUN 2225 magneto to the following values:
- left-hand magneto 5 deg. before top dead centre
- right-hand magneto 10 deg. before top dead centre
.
Breaker contact surfaces
should be clean, free of
damage and
at the instant of closing.
Adjust ignition timing, after loosening the clamping sleeve then turn
I
the
magneto opposite
to its
rotor sence
of rotation to
iminate
backlash, with correctly adjus
value of spark advance on the
I
crankshaft (in detail se 12.2.). Correct position is at the moment when
the contacts break up.
Accurate ignition timing adjustment:' is accomplished during engine test
run so that
switching any of the two ignition
magnetos
'OFF
results
an engine speed drop by fUl'l-throttle within 30-50 rpm.
7.5. Spark Plugs
Use spark
plugs
given
in
3.2.,
checking
the
condition
of
r
ectrodes.
Issued 9/95
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