Checking Engine Rpm; Checking Engine Speed - Vetus M4.55 Operation Manual

4 Maintenance
C
aution
The maximum engine speed adjust-
ment screw has been correctly set
at the factory and sealed. DO NOT
attempt to remove this seal.
At full load (with the boat cruising) the
maximum engine speed should be about
3000 RPM (see technical data page 80). If
the engine does not reach this speed, it is
being overloaded!
If this is the case, check the ship's pro-
peller for defects or irregularities, and
also to see that it is the correct pitch and
diameter.
VD00134

58 Checking engine speed

The engine idling speed should be
900 rpm.
Allow the engine to warm up normally
(until the coolant temperature reaches at
least 60°C (140°F).) before checking and/
or adjusting the idling speed.
Check the engine RPM using a rev. coun-
ter, or use the rev. counter fitted to the
control panel.
Checking engine speed
Increasing RPM
Lead seal
VD00145
59 Adjusting engine idling speed
If the engine speed differs from that stated
above, it must be adjusted.
The engine idling speed can be reset
using the adjustment screw on the fuel
pump.
Minimum
speed adjust-
ment screw
Maximum
speed adjust-
ment screw
10
59