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SHUTDOWNS AND ALARMS
1. Your unit is fitted with a system to protect it from high
water temperature or low oil pressure.
a. Generator sets have shutdown systems to stop the
engine. They have no warning horns.
b. Other alarms and shutdowns are available as
optional equipment.
NOTE: Do not rely on your warning to the
exclusion of careful gauge monitoring. Watching
your gauges can prevent damage to the unit and
dangerous power losses.
2. Do the following when your warning or shutdown
system is activated:
a. Engage the preheat switch to check the
temperature gauge.
b. If above 205°F (96°C), use the Troubleshooting
Guide on page 25 to isolate the cause of the
overheat.
DANGER
!
Do not open the filler cap when the engine is
warm. Opening a warm filler cap can cause
severe burns.
c. Make repairs. Restart your Marine set after the
temperature gauge registers below 200°F (94°C).
d. Watch the temperature gauge regularly and
turn off the unit if the temperature rises above
205°F (96°C) on Marine units. Repeat
troubleshooting.
3. If shutdown is activated and the temperature gauge
shows temperature within normal temperature range:
a. This shutdown could have happened because of a
too high exhaust temperature. This could have
been caused by a damaged impeller or a partially
blocked sea water strainer. Check the sea water
strainer first. If it is clear, then check the
condition of the sea water pump impeller.
b. Check the engine crankcase oil level.
c. If the oil level is low, fill with recommended
lubricating oil and restart. Watch the oil pressure
gauge carefully and shut off the engine if it does
not show a normal reading (20-60 PSI) after a
few seconds of operation.
d. If the oil level is normal, DO NOT restart the
engine. Call your dealer for assistance.
Updated 10-3-19
Operating Procedures
SPARE PARTS
1. Northern Lights recommends that you keep the
following spare parts on hand for field service. The
parts are available from your local Northern Lights
dealer. Marine models have optional "On-Board-
Kits," a handy box that contains the most common
parts you will need.
2. Northern Lights standard spare parts kit (P/N
38-0120)*
contains:
a. Primary and secondary fuel filter elements
b. Oil filters
c. Air filter element
d. Drive belt
e. Thermostat and gaskets
f. Raw water pump impeller with gaskets
g. Water pump cover o-ring
h. Rocker arm cover gasket
3. Intended for long-distance cruisers, Northern Lights
world class spare parts kit (P/N 38-03126)* contains:
a. Primary and secondary fuel filter elements
b. Oil filters
c. Air filter element
d. Drive belt
e. Thermostat and gaskets
f. Raw water pump impeller with gaskets
g. Water pump cover o-ring
h. Rocker arm cover gasket
i. Impeller kit with gasket
j. Injector assembly
k. 12v glow plug
l. Gasket set
m. Fuel lift pump and mtg. gasket
n. O-ring
o. Relay, SPDT 12v 50A
p. Workshop manual
*- For use with M843NW3 and M843NW3G generator sets with heat
exchangers. Consult your Northern Lights dealer for your unit's
specific spare parts requirements.
OM843NW3 5/21
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