Northern Lights L6125 — Flushing Cooling System

Maintenance

For the Northern Lights L6125, from the Northern Lights operator's manual.

Applies to: Northern Lights L6125, Northern Lights L6125H engine

Procedure

1. Stop engine and allow it to be cold.
2. Close seacock.
3. Remove pressure cap from expansion tank; if applicable, open cooling system air vent on turbocharger.
4. Open drains on exhaust manifold and engine block; drain fresh water system.
5. For keel cooling, vessel must be out of water to drain keel cooler.
6. Pour clean water into expansion tank until drain water is clear and free of sediment; close drains.
7. Fill fresh water system with recommended coolant mixture.
8. Close cooling system air vent on turbocharger.
9. Open seacock.
10. Start engine; check hoses and connections and repair leakage.

Full service-parts list: Northern Lights L6125 →

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.

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