Applicable to: B22 and B25 (a ll versions)
Revision 1.3 – 02/24/ 2015
Manual B – Operations
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Warm up the engine with hot air jets direct to the oil sump and engine heads.
It is necessary to use fuel specific to the season in which the engine is used. The
formulation of the fuel varies with the presence of some components or additives,
particularly alcohol, which contains water and may cause condensation under certain
conditions.
If the engine does not start it is likely that there is condensation or ice in the intake
system, due to high relative humidity. In this case it is appropriate to blow or replace
the spark plugs. In addition to this, there is also the possibility of the presence of
water condensation in the fuel. To avoid problems due to the presence of water in
the fuel it is necessary to provide the fuel circuit with a gascolator to be placed at the
lowest point in the circuit itself before the fuel pumps. This will collect, by gravity,
the water which may be present in the tanks.
Be aware that under certain conditions the presence of small drops of water on the
electrodes of the spark plugs can cause irreversible damage
.
An advantage of the fuel injection system is that there is no venturi which is present
with a carburetor. The venturi facilitates the formation of ice inside of the intake by
subjecting the air to an expansion.
In extreme cases, even in a fuel injection system, icing can occur in the intake duct
due to the cooling of the condensate on the surface of the throttle valve. This
phenomenon is very rare and occurs only when the engine is cold and there are low
throttle angles (i.e. when the presence of the throttle valve in the inlet manifold
constitutes a barrier for more than 2/3 of the total cross-section).
