Introduction; Model Numbers; Serial Numbers - Northern Lights OM944W3 Operator's Manual

The servicing of marine engines and generator sets
presents unique problems. In many cases, boats cannot
be moved to a repair facility. Marine engines cannot be
compared to the servicing of automobiles, trucks, or
even farm equipment. Failures often occur in remote
areas far from competent assistance. Marine engines are
taxed far more severely than auto or truck engines;
therefore, maintenance schedules must be adhered to
MODELS INCLUDED
This manual covers the operating instructions for:
M944W3, M944W3G and M30CW3 marine generator sets, which use the 944 engine block.
Model numbers are based on the unit's application, block model, aspiration, and RPM:
M
M - Northern Lights marine generator set
Northern Lights marine diesel generator set with
=
M944W3
a 944 engine and a PX-332K2 series generator
end with auxiliary winding. US EPA Tier III.
Northern Lights marine diesel generator set with
=
M944W3G
a 944 engine and a PX-332K2 series generator
end with auxiliary winding on a Gem series base
frame. US EPA Tier III.
Figure 1: Generator set
serial number plate.

Introduction

more strictly. Failures begin with minor problems that
are overlooked and become amplified when not corrected
during routine maintenance.
equipment and its proper maintenance. This is not a
comprehensive technical service manual. Nor will it make
the reader into an expert mechanic. Its aim is to aid you in
maintaining your unit properly.
Unit Identification

Model Numbers

944
Model number of engine block
+
Bore Cylinders
94 mm
M30CW3

Serial Numbers

Your set has three serial numbers:
a plate attached to the valve cover,
and a generator set serial number.
3
NOTE: Always use the generator set serial number when ordering parts
or in correspondence. The generator set serial number plate is found on
the service side of the generator and resembles the drawing in
OM944W3 1/23
2
As operator, it is your obligation to learn about your
W, G, C, 3
W - Auxiliary winding in generator end
G - GEM series base frame
4 C - Commercial series
3 - US EPA Tier III compliant
Northern Lights marine diesel generator set with a
=
944 engine and a PX-332K2 series generator end;
commercial unit, 30 kW, Tier III.
an engine number stamped on
1
a generator end serial number,
2
.
Figure 1