Maintenance - Section 4 OM4012.1 03/01 Page 4-2 Lubrication & Service COOLANT LEVEL CHECK Inspect the coolant sight gauge. If coolant cannot be seen in the sight gauge, it is necessary to add coolant to the cooling system before truck operation. Refer to the procedure below for the proper filling instructions. RADIATOR FILLING PROCEDURE Cooling System is pressurized due to thermal ex- pansion of coolant. DO NOT remove radiator cap while engine and coolant are hot. Severe burns may result. 1.With engine and coolant at ambient temperature, remove radiator cap. Note: If coolant is added using the Wiggins quick fill system, the radiator cap MUST be removed prior to adding coolant. 2.
Fill radiator with proper coolant mixture (as speci- fied by the engine manufacturer) until coolant is visible in the sight gauge. 3. Install radiator cap. 4. Run engine for 5 minutes, check coolant level. 5. If coolant is not visible in the sight gauge, repeat steps 1 through 4. Any excess coolant will be discharged through the vent hose after the engine reaches normal operating temperature. Engine coolant must always be visible in the sight gauge before truck operation.
COOLING SYSTEM ANTI - FREEZE RECOMMENDATIONS (Ethlyene Glycol Permanent Type Anti-Freeze) Percentage of Anti-Freeze Protection To 10 + 23°F – 5°C 20 + 16°F – 9°C 25 + 11°F – 11°C 30 + 4°F – 16°C 35 – 3°F – 19°C 40 – 12°F – 24°C 45 – 23°F – 30°C 50 – 34°F – 36°C 55 – 48°F – 44°C 60 – 62°F – 52°C Use only anti-freeze that is compatible with engine as specified by engine manufacturer.