Engine Speed Control; Engine Speed Control During Over-Revving; Engine Speed Control During Overheating; Engine Speed Control During Low Oil Pressure - SELVA MARINE Kingfish 25 Service Manual

TECH
FEA

Engine speed control

When the engine speed is more than the upper limit or when overheating or low oil pressure is
detected, the engine speed is controlled to prevent damage to the engine.

Engine speed control during over-revving

When the engine speed is 6200 r/min or more, control is performed by cutting off the power to the
ignition coil (ignition by the spark plug is stopped).

Engine speed control during overheating

When the engine cooling water temperature is 93 °C (199 °F) or more and the following engine
speed conditions are present, control will start by cutting off the power to the ignition coil (ignition by
the spark plugs is stopped) so that the engine speed does not increase to 2000 r/min or more.
During overheating control, the buzzer (remote control model) will sound and the alert indicator
(located on the bottom cowling and digital tachometer [optional]) will come on.
Engine cooling
water temperature
93 °C (199 °F) or
more
2000 r/min or more

Engine speed control during low oil pressure

When the oil pressure is at or less than the specified pressure and the following engine speed con-
ditions are present, control will start by cutting off the power to the ignition coil (ignition by the spark
plugs is stopped) so that the engine speed does not increase to 2000 r/min or more.
During low oil pressure control, the buzzer (remote control model) will sound and the alert indicator
(located on the bottom cowling and digital tachometer [optional]) will come on.
Oil pressure switch
operating
condition (on)
29.4–58.8 kPa
(0.294–0.588
kgf/cm², 4.3–8.5
psi) or less
2000 r/min or more
2-7
Technical features and description
Engine speed to
start overheating start overheating
control
400 r/min or more
Engine speed to
start low oil
pressure control
400 r/min or more
Maximum engine
Elapsed time to
control
120 seconds
25 seconds
Elapsed time to Maximum engine
start low oil speed during low
pressure control oil pressure control
10 seconds
0 second
Conditions to stop
speed during
overheating
control
Less than 88 °C
approximately
(190 °F), and 1200
2000 r/min
Conditions to stop
low oil pressure
Oil pressure switch
approximately
turns off, and the
2000 r/min
engine is stopped
overheating
control
r/min or less
control