ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 010-041   Turbocharger Coolant Hoses

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  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.

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

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Drain the coolant. Refer to Procedure 008-018 in Section 8.

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.

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

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.

• Drain the coolant. Refer to Procedure 008-018 in Section 8.
• Remove the heat shield. Refer to Procedure 011-032 in Section 11.

NOTE: Use a second wrench to hold the coolant line coupling while loosening the line.

Remove the turbocharger coolant supply line from the turbocharger and cylinder block.

Remove the turbocharger coolant return line from the turbocharger and the cylinder block.

NOTE: The graphic shown here is of the QSC8.3 marine engine. The QSL marine engine is different only in that the expansion tank is located on the front of the engine and the vent line has p-clips securing the line.

Remove the coolant vent line from the side of the turbocharger turbine housing and the coolant expansion tank.

On QSL9 engines, remove the p-clips which secure the line to the rocker lever housing.

Remove the coolant vent line.

Remove the coolant inlet hose clamps from the turbocharger turbine housing connection and the rear of the cylinder block. Remove the coolant inlet hose.

Remove the hose pipe fittings from the turbocharger turbine housing and the rear of the cylinder block.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean the turbocharger coolant hoses with solvent.

Dry with compressed air.

Inspect for burrs or debris around the banjo fittings.

Inspect for cracks in the lines and connectors. Replace as necessary.

Inspect the hose fittings and clamps for cracks or other damage.

Check the o-rings for cuts or deformation. Replace as necessary.

Check the turbocharger coolant lines for cracks or other damage. Replace if damage is found.

Check the face of the coolant fittings on the engine and on the turbocharger to make sure the o-ring is in place and is not damaged. A damaged or missing o-ring will result in a coolant leak.

Install the turbocharger coolant return line to the top of the turbocharger and the block.

Install the turbocharger coolant supply line to the bottom of the turbocharger and the block.

Check the face of the coolant fittings on the engine and on the turbocharger to make sure the o-ring is in place and is not damaged. A damaged or missing o-ring will result in a coolant leak.

NOTE: Use a second wrench to hold the coolant line coupling while tightening the line.

Tighten the fittings.

Install the pipe nipple at the rear of the cylinder block and the elbow at the bottom of the turbocharger turbine housing.

Align the elbow and tighten the banjo capscrew.

Install the molded coolant supply hose to the rear of the cylinder block and the bottom of the turbocharger turbine housing. Install the hose clamps and tighten.

Install the coolant vent line to the side of the turbocharger turbine housing.

Install the coolant vent line to the rear of the coolant expansion tank and tighten.

On QSL9 engines, install the p-clips to the rocker lever housing.

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.

• Fill the engine with coolant. Refer to Procedure 008-018 in Section 8.
• Install the heat shield. Refer to Procedure 011-032 in Section 11, if installed.
• Connect the battery. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for leaks.