COMPILER TECO/ATL
REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION
00
ENDORSED
DATE
10.06.99
89
LPG fuelled ENGINE LGW 627
HOW TO REGULATE THE SENSITIVITY OF REDUCER SE 81 SIC
The reducers will have already been regulated by the manufacturer, but if faults such as an instable idling speed or unsteady
acceleration occur, it is advisable to check the sensitivity of the reducer itself.
Adjuster screw G is not used to regulate the idling speed but just to adjust the sensitivity of the reducer. Slacken it off to
lighten the load that the spring exercises on the second stage lever or tighten it to increase the load that the spring exercises
on the second stage lever towards the shut-off position.
Since the idling flow is separate from that of max speed, the change over from idling speed to higher speeds must occur
without "carburation vacuums". These are particularly noticeable when the engine is accelerated very slowly (adjuster too
tight). Meanwhile, the reducer must remain tight and must not leak gas each time the engine is switched off (adjuster too
slack).
Proceed in the following way to adjust the sensitivity:
1) Remove the tube that conveys the gas from gas outlet tube C to
the mixer;
2) Fully tighten sensitivity adjuster G;
3) Disconnect the wire on the positive contact of idling solenoid valve
F and connect it to a +30 (battery positive) in order to charge the
gas reducer;
4) Form a bubble with soapy water on gas outlet tube C and tighten
adjuster G until gas begins to leave the reducer and to swell the
bubble;
5) The moment in which gas begins to leave the reducer, tighten
adjuster G until the gas leak stops then, from the point in which
the leak terminates, give an additional half-turn to the adjuster for
safety purposes.
6) Fit the protective cap on to sensitivity adjuster G in order to
prevent it from being tampered with.
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