ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 008-052   Expansion Tank

This procedure applies to QSL9 engines only. The expansion tank on the QSC8.3 engine is part of the heat exchanger component. Refer to Procedure 008-053.

The graphics in this procedure are of the QSL9 engine with keel cooling. The expansion tank and mounting bracket on the QSL9 engine with sea water cooling (heat exchanger) is different; however, all of the hose and vent line connections are the same.

Check the expansion tank, hoses and vent line connections for signs of leaks.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

CAUTION  Use caution when draining coolant that coolant is not spilled or drained into the bilge area. Do not pump the coolant overboard. If the coolant is not reused, it must be discarded in accordance with local environmental regulations.

• Disconnect the batteries. Refer to Procedure 013-009.
• Drain the engine coolant. Refer to Procedure 008-018.
• Disconnect the coolant level sensor connector. Refer to Procedure 019-017 in Troubleshooting and Repair Manual, ISB, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416, or Procedure 019-017 in Troubleshooting and Repair Manual, ISC, QSC8.3, ISL and QSL9 Engines, Bulletin 3666271.

Disconnect the coolant make-up hose from the expansion tank and the coolant transfer tube.

Remove the vent lines from the rear of the expansion tank.

Remove the four mounting capscrews and lift the expansion tank from the engine.

Remove the four bracket mounting capscrews and the expansion tank mounting bracket.

Remove the rubber isolators.

Inspect the mounting areas for cracks.

Inspect all connection points for cracks or signs of leakage.

Inspect the fill neck and pressure cap for leakage or cracks.

Inspect the rubber isolators for damage. Replace the isolators, if necessary.

Inspect the mounting bracket for cracks at the bolt hole areas or at the bend in the bracket.

Install the mounting bracket to the engine. Tighten the four mounting capscrews.

Install the expansion tank onto the bracket with a rubber vibration isolator and plain washer between the tank and the bracket.

Install the four mounting capscrews, rubber vibrations isolators and plain washers from the bottom of the bracket. Tighten the capscrews.

Install the vent line connections at the rear of the expansion tank to the turbocharger, exhaust manifold and thermostat housing.

Install the coolant make-up hose and clamps to the expansion tank and coolant transfer tube. Tighten the hose clamps.

• Connect the coolant level sensor connector. Refer to Procedure 019-017 in Troubleshooting and Repair Manual, ISB, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, QSL9 Engines, CM850 Electronic Control System, Bulletin 4021416, or Procedure 019-017 in Troubleshooting and Repair Manual, ISC, QSC8.3, ISL and QSL9 Engines, Bulletin 3666271.
• Fill the cooling system. Refer to Procedure 008-018.
• Connect the batteries. Refer to Procedure 013-009.

Operate the engine and check for leaks.