Northern Lights M864 / OM864W — Zinc Electrode Service

Maintenance · Heat exchanger zinc electrode

For the Northern Lights M864 / OM864W, from the Northern Lights operator's manual.

Applies to: Northern Lights M864

Procedure

1. Check the zinc electrode every 200 hours; more often in warm saltwater or where electrolysis is a known problem.
2. Remove the zinc holder from the bottom of the exchanger; this drains raw water from the exchanger.
3. Scrape or steel brush the zinc electrode clean.
4. If more than 50% of the electrode is corroded away, replace it with a new zinc; the electrode screws out of the holder.
5. Reinstall the zinc holders with clean threads; do not use thread sealant.
6. Refill the cooling system, start the engine and check for leaks.

Full service-parts list: Northern Lights M864 →

Source: Northern Lights operator'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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