Northern Lights M1064H / M1066H — Flushing the Cooling System
Maintenance
For the Northern Lights M1064H / M1066H, from the Northern Lights operator's manual.
Applies to: Northern Lights M1064H, Northern Lights M1066H, John Deere Powertech Tier II 4045 engine, John Deere Powertech Tier II 6068 engine
Before you start
- Use extreme caution when working on hot engines to avoid burns.
Procedure
- Flush cooling system and check for leaks and blockage every 2000 hours with engine stopped and cold.
- Close seacock.
- Remove pressure cap from expansion tank; open cooling system air vent on turbocharger if applicable.
- Open drains on exhaust manifold and engine block; drain fresh water system.
- For keel cooling, vessel must be out of water to drain keel cooler.
- With drains open, pour clean water into expansion tank until water from drain is clear.
- Close drains when flushing complete.
- Fill fresh water system with recommended coolant mixture.
- Close cooling system air vent on turbocharger.
- Open seacock.
- Start engine; check hoses and connections and repair leakage.
Full service-parts list: Northern Lights M1064H →, Northern Lights M1066H →
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.