Lubrication & Maint./2000 Hour/24 Month 10. After draining water, close drain valves. Reinstall radiator cap and radiator hose and clamp. Fill the cooling system with clean water and a heavy duty cooling system cleaner such as Fleetguard RESTORE and RESTORE PLUS . Follow manufacturer’s directions on label. 11. After cleaning the cooling system, drain cleaner and fill with water to flush the system. Run the engine about 10 minutes, remove radiator cap and pull off lower radiator hose to drain out flushing water. 12. Close all drain valves on engine and radiator. Reinstall radiator hose and tighten clamps securely. Install thermostats using a new gasket.
(See TESTING THERMOSTATS OPENING TEMPERATURE later in this section.) IMPORTANT: Air must be expelled from cooling system when system is refilled. Loosen temperature sending unit fitting at rear of cylinder head or plug in thermostat housing to allow air to escape when filling system. Retighten fitting or plug after filling cooling system. 13. Add coolant to radiator until coolant touches bottom of filler neck. (See specification for capacity.) Install radiator cap. Specification 4.5 L Engine— Coolant Capacity 8.5 L (9 qt) ............................................. 6.8 L Engine—Coolant Capacity 11.3 L (12 qt) .......................................... 14.
Run engine until it reaches operating temperature. This mixes the solution uniformly and circulates it through the entire system. The normal engine coolant temperature range is 82 ° ° C (180 ° 202 ° F). 15. After running engine, check coolant level and entire cooling system for leaks. Fleetguard is a trademark of Cummins Engine Company, Inc. RESTORE is a trademark of Fleetguard. RESTORE PLUS is a trademark of Fleetguard. Continued on next page OURGP11,0000221 –19–15OCT03–3/4 35-5 021604 PN=163