Northern Lights — Cooling System Flushing (SP-13)

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 844L engine

Procedure

1. Flush cooling system every 2500 hours or every 24 months, whichever comes first.
2. Remove expansion tank cap and drain engine block.
3. Open block drain cock and remove plug in lower left side of heat exchanger tank.
4. Pour clean water into expansion tank until water from drains is free of discoloration.
5. Let water drain completely, close drains and refill with recommended mixture.
6. Check hoses and connections and repair any leakage.

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.

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