Northern Lights — Clean heat exchanger (marine)

Maintenance

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

1. Clean heat exchanger core once a year or after 2500 hours.
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; flush, inspect and clean again if necessary.
5. Reassemble, fill cooling system, start engine and check for leaks.

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.

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