Northern Lights 984K / M984 — Flushing the cooling system
Maintenance
For the Northern Lights 984K / M984, from the Northern Lights operator's manual.
Applies to: Northern Lights M984, Northern Lights 984K engine
Before you start
- Cooling water reaches extremely high temperature; allow the engine to cool and open the filler cap carefully with protective clothing.
Procedure
- Flush every 600 hours or every 12 months, whichever comes first; close the sea-cock first.
- Remove the fill cap and open the drains on the engine block.
- Pour clean water into the engine until water from the engine is clear of discoloration.
- Close the drains and refill with 50% water / 50% ethylene glycol antifreeze mix.
- Check hoses and connections and repair any leakage.
- Start the engine, run five minutes, shut down, let cool and recheck coolant level.
- Open the sea-cock after working on the cooling system.
Specs & values
- 50% water / 50% ethylene glycol
Full service-parts list: Northern Lights M984 →
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.