ISBe/ISB Series Engines – 008-047   Radiator Pressure Cap

The cooling system is designed to use a pressure cap to prevent boiling of the coolant. Refer to the OEM’s cooling system specifications for the correct radiator pressure cap for your application.

An incorrect or malfunctioning cap can result in the loss of coolant and the engine running hot.

Be sure the correct radiator pressure cap is being used.

Inspect the rubber seal of the pressure cap for damage.

Inspect the radiator fill neck for cracks or other damage.

Refer to the OEM service manual for instructions if the fill neck is damaged.

Pressure-test the radiator cap. Refer to the OEM service manual for radiator cap test procedures.

The pressure cap must seal within 14 kPa [2 psi] of the value stated on the cap, or it must be replaced.

An incorrect or malfunctioning cap can result in the loss of coolant and the engine running hot.