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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: M843NW3 and M843NW3G marine generator set.
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 an 843 engine and a PX-312K2 generator end. US EPA Tier III.
M843NW3
=
M843NW3G
=
Northern Lights marine diesel generator set with an 843 engine, PX-312K2 generator end on a Gem series base frame.
US EPA Tier III.
Generator set serial number plate.
Updated 10-13-20
Introduction
Unit Identification
Model Numbers
843
Model number of engine block
+
Bore
Cylinders
84 mm
3
Serial Numbers
Your set has three serial numbers:
on the block,
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 5/21
2
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.
N, W, G, 3
N - Base engine designation
+
W - Auxiliary Winding in Generator
End
G - GEM series base frame
3 - US EPA Tier III compliant
an engine number stamped
1
a generator plate, and
2
3
a generator set plate.
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