7-2, CHOKE TESTING AND ADJUSTMENTS (4.5 TWIN,
5.5, 7, 7.5kW)
7-2.1. General. The choke on the 4.5 (twin), 5.5, 7 and
7.5kW models is an intergral part of the carburetor. The
choke wit1 close automatically from ambient air. Upon
starting, the engine vacuum will partially open the choke.
The bi-metal spring in the choke is e&trically connected to
the ignition coil and the current flowing thrbugh the bi-
metal spring will heat to a point that the choke will open
fully.
7-2.2. Inspection.
1. Disconnect the high tension leads from spark plugs so
the engine will not start.
2. Remove the air cleaner cover, element and base plate.
3. Push the start switch on the controller to the start posi-
tion and hold for five seconds. The choke should fully close
and release when the start switch is released.
Figure 7-2. Choke (4.5 Twin, 5..5,7,7.5 kW)
4. If the choke does not function properly (Step 3), see
troubleshooting, Table 7-2.
7-2.3. Adjustment. The choke unit (Figure 7-2) is set at
the factory for average conditions. To readjust for local
conditions, loosen the cover retaining screws and shift the
cover in clockwise direction for richer setting or counter-
clockwise direction for leaner setting. Tighten the cover
retainer screws.
start position, battery current thru the solenoid holds the
plunger and continues to hold it while the engine is run-
ning. When the switch is moved to the stop position the
solenoid de-energizes and drops the plunger into a porting
in the carburetor to stop all flow of fuel.
7-3.2. Inspection and Repair.
1. Make sure the solenoid has a secure electrical connection
and good contact with the hold down bracket (ground).
7-3. POSITIVE SHUTDOWN CONTROL (3.5kW-7kW)
2. Check for stuck plunger. Replace if,.damaged.
7-3.1. General. If an engine has been working under load,
it tends to continue running or “diesel” after the switch is
moved to the stop position. This is prevented on these
generator sets by a solenoid and plunger which positively
stops all flow of fuel when the switch is moved to the stop
position. See Figure 7-I or Figure 7-3. The solenoid is
mounted on the carburetor. When the switch is in the
3. Check for defective solenoid with an ohmmeter or multi-
meter. Solenoid resistance is approximately 20 ohms.
7-3.3. Temporary Field Fix.
1. Turn the main fuel adjusting needle out then shift the
solenoid retaining bracket.
PROBLEMS
Choke won’t close during
cranking.
Choke will not4ully open.
CAUSES
Faulty lead to choke.
Fau
ty lead to ground.
PO0 r
s adjustment.
SOLUTlONS
1.
2.
1.
2.
1.
2.
Check for secure lead connections
Make continuity check on lead. Re-
place if no continuity.
Check for secure lead connections.
Make continuity check on lead. Re-
place if no continuity.
Adjust choke.
Repair with kit or replace choke.
1. Poor adjustment.
2. Faulty choke.
1. Adjust choke.
2. Repair with kit or replace choke.
Table 7-2. Troubleshooting Choke (4.5 Twin, 5.5, 7, 7.5kW)
7-3
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