Specifications

Service Training
Section 4.9
Page 40
12.05
It works as follows:
When the engine starts, a vacuum is passed through the connection (4) to the gas shutoff valve and opens
the valve.
This enables LPG to flow to the vaporisor and from there to reach the mixer via connection (6) in a gaseous
state. The fresh air flowing into the mixer at connection (2) is processed in the mixer into an ignitable mixture
and reaches the intake manifold through connection (1) and from there into the individual engine cylinders.
Through connection (7), the vacuum is passed to the gas-air regulating valve and thus regulates the opening
of this valve.
With adjustment screws (5) and (8), two limited mixture ratios are adjusted.
MIXTURE ADJUSTMENT FOR IDLING
The air and gas mixture which flows past the almost-closed throttle valve in idling mode is constant. In idling
mode, part of the inflowing air is conducted to the air inlet valve. The idling setting is controlled using the
idling mixture adjustment screw (8), by which the gas-air mixture in idling mode is thinned or enriched.
MIXTURE ADJUSTMENT FOR FULL LOAD
This setting controls the mixing proportions if the gas regulator valve is open. This setting is only effective
if the engine is approaching its maximum load. The setting of the full load mix adjusting screw (5) can only
be effective with an engine under full load close to its maximum r.p.m. speed (rated speed).
Mix formation between idling and full load conditions is controlled by the form of the gas regulation valve.
The gas regulation valve is formed in such a way that with a smaller load the mixture is thinner and as the
load and engine speed rise, the mixture is steadily enriched.