Northern Lights — Winterizing / out-of-service (marine)
Maintenance · Generator set
From a Northern Lights owner's manual covering: M20C, M844, M844L. Check it applies to your exact model before use.
Applies to: Northern Lights M20C, Northern Lights M844, Northern Lights M844L, Northern Lights 844L engine
Procedure
- Drain fresh water and seawater cooling systems completely; shut off seacocks before opening drain cocks.
- Drain water supply lines and wet exhaust line.
- Loosen the seawater pump cover and drain pump.
- Change the crankcase oil and filter.
- Loosen the alternator belt.
- Disconnect and clean battery; remove to warm storage place if possible.
- Clean outside of unit; paint scratched or chipped surfaces; put corrosion preventative on exposed metal.
Full service-parts list: Northern Lights M20C →, Northern Lights M844 →, Northern Lights M844L →
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.