To determine if combustion gases in coolant is causing high engine coolant temperature, perform
the cylinder compression test. Refer to section 13.9.1.
13.9.1
Cylinder Compression Test
13.9.2
Cylinder Head Gasket Replacement
Perform the following steps to replace cylinder head gasket:
1. Remove and replace cylinder head gasket; refer to appropriate service manual, engine
chapter.
2. Verify new cylinder head gasket replacement; refer to section 13.9.2.1.
13.9.2.1
Test Engine with Replaced Cylinder Head Gasket
Perform the following to determine if the cylinder head gasket replacement resolved high engine
coolant temperature:
1. Start and run the engine.
2.Run the engine through its operating range with no-load for approximately 5 minutes,
allowing the engine coolant to reach normal operating range.
[a] If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting
is required. Shut down the engine.
[b] If the engine coolant temperature is not 88-96°C (190-210°F), shut down the engine.
Check radiator coolant flow; refer to section 13.10.
