Introduction; Models Included; Model Numbers; Serial Numbers - Northern Lights M843NW3 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: M843N
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
M843NW =
3
an 843 engine and a PX-312K2 generator end,
Tier III.
Generator set serial number plate.
Revised 12-19-2011

Introduction

Failures can begin with minor problems that are
overlooked and become amplified 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.
Unit Identification
marine generator set.
W3
My Northern Lights generator set MODEL number is:

Model Numbers

Model number of engine block
+
Bore
84 mm

Serial Numbers

Your set has three serial numbers:
on the block, a generator plate, and
2
Use the serial number on the generator set plate when ordering parts
or in correspondence. The generator set plate is found on the service
side of the generator and resembles the drawing at left.
OM843NW3 11/13
2
843
+ W - New winding
Cylinders
3 - Tier 3
3
an engine number stamped
1
a generator set plate.
3
W and 3