FUSO 4M4 – COOLING – ON-VEHICLE INSPECTION AND ADJUSTMENT – Air/Gas Leakage Test

• Presence of air or exhaust gas in coolant accelerates corrosion of the cooling system components. To prevent this, carry out air/ gas leakage tests in accordance with the following procedure.
• Remove the pressure cap.

• Run the engine until the coolant temperature rises to approximately 90°C.
• If air bubbles appear continuously through the filler port, there is air or exhaust gas penetrating into the cooling system.
• Presence of air in coolant can be an indication of loose cylinder head bolts, loose water pump mounting bolts, loose hose connections, and/or a damaged hose.
• Presence of exhaust gas in coolant can be an indication of a damaged cylinder head gasket and/or cracks in the cylinder head.

 

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