Northern Lights — Flushing the Cooling System
Maintenance
From a Northern Lights owner's manual covering: NL445D, NL445D1, NL445T1, NL445T2, NL668T2. Check it applies to your exact model before use.
Applies to: Northern Lights NL445D1, Northern Lights NL445T1, Northern Lights NL445T2, Northern Lights NL668T2, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine
Before you start
- Allow the engine to cool before working on the cooling system. Open the filler cap carefully using protective clothing when the engine is warm.
Procedure
- Pressure test the entire cooling system and pressure cap if not previously done.
- Slowly open the filler cap to relieve pressure.
- Open the engine block drain valve on the left side of the engine and drain all coolant.
- Open the radiator drain valve and drain all coolant from the radiator.
- Remove the thermostats, install the cover and tighten cap screws to 47 Nm (35 lb-ft).
- Close all drain valves, fill with clean water, run the engine about ten minutes, then stop and drain before rust and sediment settle.
- Fill with clean water and a cooling system cleaner such as Fleetguard RESTORE and RESTORE PLUS; follow label directions.
- Drain cleaner, flush with water, run the engine ten minutes and drain.
- Close all drain valves and install thermostats using a new gasket.
- Add coolant to the radiator until it touches the bottom of the filler neck.
- Run the engine to operating temperature and check the coolant level and system for leaks.
Specs & values
- Thermostat cover cap screws 47 Nm (35 lb-ft)
- Normal coolant temperature range 82°C - 94°C (180°F - 202°F)
Full service-parts list: Northern Lights NL445D1 →, Northern Lights NL445T1 →, Northern Lights NL445T2 →, Northern Lights NL668T2 →, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine →
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.