Northern Lights M864 — SP18. Zinc Electrodes
Maintenance
For the Northern Lights M864, from the Northern Lights owner's manual.
Applies to: Northern Lights M864
Before you start
- Do not use thread sealant on zinc holder threads.
Procedure
- Check the zinc electrode every 200 hours; more often in warm saltwater or where electrolysis is a known problem.
- Remove the zinc holder from the bottom of the exchanger to drain raw water.
- Scrape or steel brush the zinc electrode clean.
- If more than 50% of the electrode is corroded away, replace it with a new zinc.
- Reinstall zinc holders; be sure threads are clean for good metal-to-metal contact; do not use thread sealant.
- Refill the cooling system, start the engine and check for leaks.
Tools required
- Steel brush Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Check every 200 hours
- Replace if more than 50% corroded
Full service-parts list: Northern Lights M864 →
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.