Northern Lights — Flushing Cooling System

Maintenance

From a Northern Lights owner's manual covering: L6140A, L6140AL2, M6140A, M6140AL2, M6140QA. Check it applies to your exact model before use.

Applies to: Northern Lights M6140A, Northern Lights M6140AL engine

Procedure

1. Stop engine and allow it to cool.
2. Close sea cock before working on cooling system.
3. Remove filler cap with caution.
4. Open cooling system air vents.
5. Drain jacket water circuit and raw water circuit.
6. Pour clean water into filler until drains run clear.
7. Close drains, re-drain and refill with coolant mixture.
8. Close vents, open sea cock, start engine and check for leaks.

Full service-parts list: Northern Lights M6140A →

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.

More Northern Lights repair guides →