Faulty Water Pump
To determine if a faulty water pump is causing high engine coolant temperature, perform the following:
- Remove the water pump (gear case mounted); refer to "4.2.2 Draining and Removal of Water Pump" .
- Turn the water pump over and install J 35687
, water pump impeller slip and lash tester, into the tapped holes provided in the impeller; see Figure
"Measuring Water Pump Drive Gear Run-Out"
Figure 1. Measuring Water Pump Drive Gear Run-Out
- Clamp the water pump drive gear in a vise, with the impeller facing up. Use soft jaws to prevent damage to the gear teeth.
- Using a 1/2 in. drive torque wrench in the hole provided in the center of the slip-lash tester, apply 68 N·m (50 lb·ft) torque in either direction. The impeller must withstand 68 N·m (50 lb·ft) torque without slipping.
Water Pump Impeller Replacement
Perform the following steps to replace water pump impeller:
- Disassemble the water pump and replace worn or damaged impeller; refer to "4.2.3 Disassembly of Water Pump" for (gear case mounted).
- Reassemble the water pump with new components as necessary; refer to "4.2.4 Assembly of Water Pump" for (gear case mounted).
Test Engine with Repaired Water Pump
Perform the following to determine if thermo-modulated fan replacement resolved high engine coolant temperature:
- Start and run the engine.
- Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
- If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required. Shut the engine down.
- If the engine coolant temperature is not 88-96°C (190-210°F), shut the engine down. Check combustion gases in coolant; refer to "27.9 Combustion Gases in Coolant" .
|Series 50 Service Manual - 6SE50|
|Generated on 10-13-2008|