Northern Lights — Shutdowns and Alarms
Testing & diagnosis · Genset
From a Northern Lights owner's manual covering: 844DW3, 844LW3, M20CRW3, M844DW3, M844LW3, M844W3. Check it applies to your exact model before use.
Applies to: Northern Lights M20CRW3, Northern Lights M844DW3, Northern Lights M844LW3, Northern Lights M844W3, Northern Lights 844 (844L for LW models) engine, Northern Lights 844L engine
Before you start
- Do not remove the water fill cap of an overheated engine. Escaping high temperature steam can cause severe burns.
- If the oil level is normal, DO NOT restart the engine; call your dealer.
Procedure
- Engage the preheat switch to check the temperature gauge.
- If above 205°F (96°C), use the Trouble Shooting Guide to isolate the cause of the overheat.
- Make repairs; restart after the temperature gauge registers below 200°F (94°C).
- Watch the temperature gauge regularly and turn off the unit if temperature rises above 205°F (96°C).
- If shutdown activates within normal temperature, check exhaust temperature, sea water strainer and impeller.
Specs & values
- Overheat threshold above 205°F (96°C)
- Restart below 200°F (94°C)
- Normal oil pressure 20-60 PSI
Full service-parts list: Northern Lights M20CRW3 →, Northern Lights M844DW3 →, Northern Lights M844LW3 →, Northern Lights M844W3 →
Source: Northern Lights owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.