Trolling Operation Valve; When Sailing; Checking Instruments - Volvo Penta 22 Series Instruction Book

B A C

Trolling operation valve

HS25 reverse gear can be equipped with a trolling operation valve which
makes it possible to steplessly reduce the boats lowest speed by 1-80%
at engine speeds up to 1200 rpm.
IMPORTANT! At higher speed the reverse gear may overheat.

When sailing

When sailing the control lever should be in the neutral position if the
boat is equipped with HS25 reverse gear. If the boat is equipped with S-
drive or MS2/MS25 reverse gear the control lever should be the reverse
position if a folding propeller is used and in neutral position if a fixed
propeller is used.
IMPORTANT! S-drive and MS2 with fixed propeller: When
sailing long distances the engine should be started for five minutes
every 10 hours to cool the drive/reverse gear. If this is not possible
then a propeller shaft brake must be installed.

Checking instruments

Check the instruments and warning display directly after starting the
engine and then at regular intervals while driving the boat.
Oil pressure (A)
Normal operating oil pressure is between 150-500 kPa (21-71 psi). At
engine idle this is normally lower. The acoustic alarm will automatically
go off and the warning lamp will light up if the oil pressure is too low.
IMPORTANT! At the alarm the engine should be stopped
immediately. Investigate and correct the malfunction.
Engine coolant temperature (B)
Normal operating temperature is between 75-90°C. The acoustic alarm
will automatically go off and the warning lamp will light up if the coolant
temperature is too high.
IMPORTANT! At the alarm the engine speed should be reduced to
idle (neutral). Stop the engine if the temperature does not drop.
Investigate and correct the malfunction.
Charging (C)
During operation the charge voltage should be around 14 V. With the
engine stopped voltage is approximately 12 V. In event of charging
failure the alarm sounds at the same time as the warning lamp is lit.
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