42
Fig. 2.36
H
N
P
R
P1
P2
Fig. 2.37
Fig. 2.38
Tab. 2.34 Tab. 2.35
ED0053030410
TECHNICAL INFORMATION
2.14 Sensors and switches
2.14.1 Fuel lter water detection sensor (optional)
The water presence sensor in the fuel lter serves to indicate
the presence of water in the fuel.
The sensor closes the electrical circuit and the warning lamp
in the panel board switches on the dashboard of the car on
which the motor is mounted.
Water, if present in the fuel, because of its greater specic
weight separates and settles in the lower part of the lter
where there is a drain plug.
Gently loosen the water drain plug without removing it and
spill out the water if present. Re-tighten the water drain plug
H as soon as the fuel spills.
2.14.2 Oil pressure switch
Oil pressure switch N is situated on the crankcase near to the
injection pump.
It is a N/C switch, calibrated at 0.8 bar ± 0.1 bar.
The switch closes the electrical circuit and the warning lamp in
the panel board switches on the dashboard of the application
on which the motor is mounted.
2.14.3 Coolant temperature sensor
The coolant temperature sensor P of the cooling circuit is
situated on the engine head.
Sensor P1 or P2 (Fig. 2.39) can be assembled on the engine:
P1 Characteristics indicated in Tab. 2.34 (blue connector).
Thermal contact N/O with closing temperature at +110 °C
±3°C, re-opening +88 °C / +100 °C.
P2 Characteristics indicated in Tab. 2.35 (white connector).
Thermal contact N/O with closing temperature at +110 °C
±3°C, re-opening +88 °C / +100 °C.
NOTE: R indicates the pin where it is possible to measure
electrical resistance.
SENSOR P1 CHARACTERISTICS
°C R min Ω R max Ω
-35 53.983 73.806
-30 39.229 52.941
-15 18.006 20.825
0 7.095 8.929
30 1.717 2.039
60 0.520 0.589
90 0.18 8 0.204
120 0.076 0.084
SENSOR P2 CHARACTERISTICS
°C R min Ω R max Ω
-36 11.835 15.724
-30 8.258 10.834
-16 3.721 4.753
0 1.611 2.003
30 414,1 493
60 132 151,7
90 50,27 56,11
120 21,6 24,29
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