Cruising Speed; Synchronising Engine Speed - Volvo Penta D4 Operator's Manual

Operation
52
Alarm
If a fault occurs, the audible warning will sound and the
relevant warning lamp on the optional alarm display will
start to flash and the tachometer display will show a alarm
pop-up.
1. Reduce engine speed to idling.
2. Acknowledged the larm by pressing the navigation
wheel on the control panel once.
When the fault has been acknowledged, the lamp con-
cerned gives constant light and the audible warning will
become silent.
Please refer to the chapters "In case of emergency" and
"Fault register" and you will find detailed information about
recommended action.
The fault will also be stored in the form of a fault code for
as long as the malfunction remains. It is possible to read
the fault code during a subsequent service.

Cruising speed

Avoid operation at full throttle, for best fuel economy. We
recommend a cruising speed which is at least 10% below
the maximum engine speed at full speed (full throttle). The
maximum engine speed will vary due to propeller choice,
load and sea conditions, but it should be in the full throttle
range.
Full throttle range:
D4 ...................................................... 3400–3600 rpm
D6 ...................................................... 3400–3600 rpm
If the engine does not reach the full throttle range, this
could be caused by a number of factors which are noted in
the "Fault tracing" chapter. If the engine speed exceeds the
full throttle range, select a coarser pitch propeller. Ask your
Volvo Penta dealer for advice.