Northern Lights — Heat Exchanger (SP-14)

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. Clean the heat exchanger core every 24 months, after 2500 hours, or as needed.
2. Drain expansion tank and heat exchanger.
3. Remove heat exchanger end covers and remove core.
4. Clean inside of exchanger core tubes using a metal rod.
5. Flush, inspect and clean again if necessary.
6. Reassemble, fill cooling system, start engine and check for leaks.

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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