Introduction; Models Included; Model Numbers - Northern Lights OM844W3 Operator's Manual

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 more
strictly.

MODELS INCLUDED

This manual covers the operating instructions for:
M844
W3
M844
LW3
M20
CRW3
NOTE: There are two versions of the 844W3 engine. The standard engine is designated 844W3. The long-stroke
engine is designated 844LW3. You will need to know which engine you have to use this manual and to order parts.
Fill in the model number of your unit in the blank space provided.
This will give you a reference whenever service or maintenance is required:
Model numbers give the unit's application, block model, aspiration, and RPM:
M
M - Northern Lights marine generator set
Northern Lights marine diesel generator set with
M844W
3 =
an 844 engine and a PX-316K2 generator end.
Northern Lights marine diesel generator set with
M844LW
3
=
an 844L engine and a PX-320K2 generator end.

Introduction

Unit Identifi cation
marine generator sets,
marine generator sets, and
commercial generator sets.

Model Numbers

Model number of engine block
+
Bore
84 mm
OM844W3 5/11
Failures can begin with minor problems that are
overlooked and become amplifi ed when not corrected
during routine maintenance.
As operator, it is your obligation to learn about your
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.
My Northern Lights generator set MODEL number is:
844
Cylinders
4
M20CRW3
Northern Lights 20 kW (@ 60 Hz) commercial grade
=
marine generator set with a special generator end.
2
W, L, C, 3
W - New winding
+
L - Long stroke version
C - Commercial version
3 - Tier 3