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Visual Checks

WARNING
Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 120°F (50°C) before removing pressure cap. Heated coolant spray or steam can cause injury.

All planned maintenance charts define checks to be completed at a calendar interval. Coolant, lubricating oil and coolant levels can be at normal levels, but can be contaminated (Figure 2). When performing normal maintenance inspections look for the following:

Air Restriction Indicator – Indicates when air restriction to intake is greater than manufacturer specifications. Red in color means change air filter (scheduled or not). Generally indictor located on air filter housing. Can be reset after filter change.
Fuel Water Separator – This filter separates water from fuel contaminated with water. Water is routed to bottom bowl and can drain via valve. This can indicate main fuel source supply is contaminated.
Water Indicating Paste – Used to test main fuel supply. Spread on tank level stick. Pink in color with no water. Turns red when fuel is contaminated with water. Generally water at the lower section of tank.
Oil in Coolant – Oil floating on the coolant when cooling system is at ambient temperature. Can appear milky after engine operation. Engine lubricating oil leak into cooling system. Can be cylinder head gasket, defective engine block or cylinder head. Defect is where oil pressure is higher than coolant pressure.
Coolant in Oil – Oil has milky color on dipstick. Coolant leak into engine lubricating oil. Can be cylinder head gasket, defective engine block or cylinder head. Defect is where coolant pressure is higher than oil pressure.

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