Northern Lights M864 — SP15. Cooling System Flushing
Maintenance
For the Northern Lights M864, from the Northern Lights owner's manual.
Applies to: Northern Lights M864
Before you start
- Be sure to open the sea-cock after working on the cooling system and starting the engine.
Procedure
- Flush the cooling system every 750 hours or every 12 months, whichever comes first.
- Remove fill cap and open drains on engine block (hex-headed drain is on service side below intake manifold, next to flywheel housing).
- Pour clean water into the engine until water coming from engine is clear of discoloration.
- Close drains and refill the engine with recommended coolant mixture (50% water / 50% ethylene glycol antifreeze).
- Check hoses and connections and repair any leakage.
- Start engine and check for leaks; run five minutes then shut down; let cool and check coolant level; add as needed.
Specs & values
- 50% water / 50% ethylene glycol antifreeze mix
- Flush every 750 hours or 12 months
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.