Tennant 1550, Manual

Page: 77 / 628

MAINTENANCE
3--31
1550 Gas/LPG/Diesel MM283 (9--01)
DISTRIBUTOR IGNITION TIMING
There are two methods of checking ignition
timing: with or without a timing light.
The preferred method is to use a timing light in
the following sequence:
NOTE: Painting a line on the front pulley will make
the timing mark more legible under the timing
light.
03944
CRANKSHAFT PULLEY TIMING MARK
1. Clip the blue secondary lead of light to the
#1 spark plug. Leave the spark plug wire on
the plug.
2. Connect the primary red positive lead to the
positive terminal of the battery.
A
B
C
D
E
F
G
H
00059
TIMING LIGHT HOOKUP
A. Crankshaft Pulley
B. Timing Light
C. Blue Lead
D. Black Lead
E. Red Lead
F. Battery
G. Head Bolt
H. Spark Plug
3. Connect the black primary negative lead to
the cylinder head cap screw or the alternator
bracket. Disconnect the vacuum line from
the distributor to the manifold, and clamp the
end of the line leading to the manifold.
4. Start the engine and run it at idle speed,
400 rpm or lower, so the automatic advance
of the distributor is completely retarded.
NOTE: The engine must be operating at or below
400 rpm to obtain the correct engine timing.
5. Direct the timing light on the crankshaft
pulley and note the timing marks as the light
flashes.
6. Timing is 2
_
for gasoline TM27 engines, and
5
_
for LPG TM27 engines.
7. To advance the timing, turn the distributor
body clockwise. To retard the timing, turn
the distributor body counterclockwise.
8. When the timing is correct, tighten the
distributor clamp screw securely. Then
recheck timing again with the light.
9. This operation is best performed in a shaded
area so the timing light is visible.
10. After setting the timing, remove the clamp
and reconnect the rubber tube to the
vacuum advance unit on the distributor.