Northern Lights — SP-13 Cooling System Flushing
Maintenance
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
- Be sure to close the sea-cock before working on the engine cooling system.
- Allow the engine to cool before working on the cooling system; open filler cap carefully.
Procedure
- Flush the cooling system every 2500 hours or every 24 months, whichever comes first.
- Remove expansion tank cap and drain engine block.
- Open block drain cock; remove plug in lower left side of heat exchanger tank.
- Pour clean water into expansion tank until water from drains is free of discoloration and sediment; let drain completely.
- Close drains and refill with recommended mixture.
- Check hoses and connections and repair any leakage.
Specs & values
- Use 50% water / 50% ethylene glycol antifreeze mix
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.