Northern Lights — SP-15 Cooling System Flushing
Maintenance
From a Northern Lights operator's manual covering: M30, M38C3, M38C3F, M40C3F, M944. Check it applies to your exact model before use.
Applies to: Northern Lights M30, Northern Lights M38C3, Northern Lights M38C3F, Northern Lights M40C3F, Northern Lights M944
Before you start
- Be sure to open the sea-cock after working on the cooling system and starting the engine.
Procedure
- Flush cooling system every 2000 hours or every 12 months, whichever comes first.
- Remove fill cap and open drains on engine block.
- Pour clean water into engine until water coming from engine is clear of discoloration; close drains.
- Refill with 50% water / 50% (maximum) ethylene glycol antifreeze mix.
- Check hoses and connections and repair any leakage.
- Start engine, run five minutes, shut down, let cool and check coolant level.
Specs & values
- Coolant capacity approximately 3 gal. (11.4 liters)
Full service-parts list: Northern Lights M30 →, Northern Lights M38C3 →, Northern Lights M38C3F →, Northern Lights M40C3F →, Northern Lights M944 →
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.