Lubrication & Maint./2000 Hour/24 Month 3. All Except 4045HF475 and 6068HF475 Engines: Open engine block drain valve (A) on left side of engine. Drain all coolant from engine block. NOTE: On 475 engines, the engine block drain valve is located behind the fuel rail, and is not easily accessible. RG8019A –UN–19JUN00 4045HF475 and 6068HF475 Engines: Open drain plug (B) or (C) on oil cooler housing. Drain all coolant from engine block. NOTE: These engines use several different oil filter adapters. Use either drain plug (B) or (C) to drain coolant, whichever is more accessible for the oil filter adapter on your engine. Engine Block Drain Valve- Except 475 Engines 4. Open radiator drain valve.
Drain all coolant from radiator. 5. Remove thermostats at this time, if not previously done. Install cover (without thermostats) using old gasket and tighten cap screws to 47 (35 lb-ft). RG12223 –UN–11JUN02 6. Test thermostat opening temperature. (See Inspecting Thermostats And Testing Opening Temperature in Service As Required Section.) Engine Block Coolant Drain Plug- 475 Engines 7. Close all drain valves after coolant has drained. A—Engine Block Drain Valve B—Engine Block Drain Plug C—Engine Block Drain Plug CAUTION: Do not run engine longer than 10 minutes. Doing so may cause engine to overheat which may cause burns when radiator water is draining. 8.
Fill the cooling system with clean water. Run the engine about 10 minutes to stir up possible rust or sediment. 9. Stop engine, pull off lower radiator hose and remove radiator cap. Immediately drain the water from system before rust and sediment settle. Continued on next page OURGP11,0000221 –19–15OCT03–2/4 35-4 021604 PN=162