Pressure Test

TO PRESSURE TEST COOLING SYSTEM:

General:
A pressure test uses a special tester to pressurize the system and simulate normal running conditions. If the system is unable to hold pressure, the engine will overheat more easily.

NOTE: A pressure test also checks for internal leaks, Some of the common sources of internal leaks are a faulty cylinder head gasket, a cracked cylinder head, or a cracked cylinder block.

Testing Procedure:
1. With the engine at normal operating temperature, pressurize the system using a cooling system pressure tester.
2. Observe the gauge reading. If the pressure drops, there is a leak in the system. A rapid drop may indicate a faulty cylinder head gasket if no external leaks can be found.

CAUTION: Exceeding the specified test pressure could damage the radiator or other cooling system components.

3. Using the correct tester adapter, test the coolant expansion tank cap opening pressure. Compare the opening pressure to the specification listed below.

Cooling System Test Pressures:
System test pressure (max.): 1.25 bar (18 psi).
Cap opening pressure: 1.3-1.6 bar (19-22 psi).