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MAINTENANCE/SERVICE
Gasoline Engine (continued)
IGNmON TIMING ADJUSTMENT
-
GAS ENGINE
A
WARNING:
To
avoid
personal
injury,
disengage all drives
and
engage
park
brake.
It is
necessary to have
the
engine running for this
procedure.
Be
sure everyone
in
the
area
is
aware
that the
machine
is
being
serviced.
Use extreme care
when working around
moving
parts.
Never
wear
loose fitting or dangling clothing.
Keep
hands, feet, clothing
and
hair
away
from moving
parts.
For
maximum
engine
performance,
position
distributor
(A)
correctly
to give proper ignition
timing.
To adjust:
1. Connect secondary
lead
of timing light to
No.
1 spark plug (8).
2.
Connect
red
primary
lead
to
positive
battery
terminal
and black
primary lead
to negative
battery terminal.
3.
If
unit
is
not
equipped
with optional
tachometer,
connect
tachometer
to
engine.
4.
Loosen
bolt
at
distributor mount
enough to
allow rotation of distributor by hand.
5.
Start
engine
and run
to normal operating
temperature.
6.
Disconnect
throttle rod at
bellcrank
(C)
and
move rod to achieve tach reading of 500
RPM.
7.
Aim timing
light
at
indicator
scale at fan end
of
engine and rotate distributor (A) to align timing
mark (D) on crank pulley with the 5· BTC
mark.
NOTE:
DO NOT use distributor vacuum advance
chamber (E)
as a
turn
handle.
8.
When marks
align,
stop engine and tighten bolt
at distributor mount.
9. Start
engine,
set at 500 RPM and recheck
timing with timing light.
NOTE: If advance units are functioning, timing
mark (D) should move down on flywheel, below
5·
mark when engine speed is
increased.
DISTRIBUTOR AND NO.
1
SPARK PLUG
TIME TO 5· BEFORE TOP CENTER AT 500 RPM
54
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