REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION
00
DATE
10.06.99
ENDORSED
COMPILER TECO/ATI
88
LPG fuelled ENGINE LGW 627
XV
Incorrect adjustments may saturate the air with LPG.
Make all the adjustments outdoors or in a well ventilated place, well away from naked flames that could create sparks.
REGULATING PROCEDURE WITH REDUCER SE 81 SIC
The first operation is to regulate the peak rate:
bring the engine to about
2
/
3
rds of its r/min speed and turn the peak
speed adjuster on the reducer/mixer tube to set the CO, HC, CO
2
values as shown in the table.
The second operation is to regulate the idling speed:
with the engine running, turn the idling screw E (clockwise to
decrease, anticlockwise to increase) until the CO, HC, CO
2
values
are as shown in the table.
Components:
A Water outlet union to connect to a return duct of the engine cooling
circuit;
B Water inlet union to connect to a delivery duct of the engine
cooling circuit;
C Gas outlet tube;
D Idle rate delivery tube (should always be positioned in the same
direction as the gas outlet tube);
E Idling adjuster;
F Positive and negative contact of the idling solenoid valve;
G Sensitivity adjuster;
H Reducer bleed plug
If there is no exhaust gas analyzer, it is advisable to:
1 max speed adjustment
Regulate the adjuster on the reducer/mixer pipe. Keep the engine accelerated (approx
2
/
3
rds of its r/min speed) and turn the
adjuster screw clockwise until the engine speed varies as the mixture becomes leaner. Now turn the same screw very slowly
in an anticlockwise direction until the engine r/min speed increases. If you continue to turn the screw in an anticlockwise
direction, the only result will be a high consumption and no increase in efficiency.
2 idling adjustment
regulate the idling speed by means of the relative adjuster on the reducer.
Proceed with a test once the idling and peak speeds have been obtained.
Carburation test with exhaust gas analyzer
The following conditions are required to correctly measure the exhaust gas:
- the engine must be at running temperature;
- the ignition must be tuned (dwell angle, firing point and idling speed must correspond to the values prescribed by the
manufacturer);
- multiple carburetor devices must be balanced (see carburetor balancing section);
- the exhaust system must be tight;
- the pick-up probe of the analyzer must be inserted at least 30 cm into the end of the exhaust
191
GAS
RATE
idling
2
/
3
rds r/min rate
idling
2
/
3
rds r/min rate
idling
2
/
3
rds r/min rate
REDUCER SE 81 SIC
1 to 1.5
0.20 to 0.50
11.5 to 12.5
12.50 to 13.50
200 to 400
50 to 80
CO
CO
2
HC
