Combustion Gases in Coolant
To determine if combustion gases in coolant is causing high engine coolant temperature, perform a cylinder compression test; refer to "2.2 Compression Pressure Test" .
- If test results are to specifications as listed in Table "Compression Testing" ; then check radiator coolant flow; refer to "14.10 Abnormal Radiator Coolant Flow" .
- If test results are not to specifications, refer to "14.9.1 Cylinder Head Gasket Replacement" .
Cylinder Head Gasket Replacement
Perform the following steps to replace cylinder head gasket:
- Remove and replace cylinder head gasket; refer to MBE 900 Service Manual (6SE9007), engine chapter.
- Verify new cylinder head gasket replacement; refer to "126.96.36.199 Test Engine with Replaced Cylinder Head Gasket" .
Test Engine with Replaced Cylinder Head Gasket
Perform the following to determine if cylinder head gasket replacement resolved high engine coolant temperature:
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.
- Start and run the engine.
- Run the engine through its operating range with no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
- If the engine coolant temperature is 70-95°C (158-203°F), no further troubleshooting is required. Shut down the engine.
- If the engine coolant temperature is not 70-95°C (158-203°F), shut down the engine. Check radiator coolant flow; refer to "14.10 Abnormal Radiator Coolant Flow" .
|EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580|
|Generated on 10-13-2008|