Coolant Line/Hose: Service and Repair

WATER HOSE AND WATER PIPE

REMOVAL AND INSTALLATION

Pre-removal & Post-installation Operation:

Thermostat Case Removal Steps 1-17, Water Pump Removal Steps 16-17:

Water Pump Inlet Removal Steps 18-21, Engine Coolant Temperature Sensor Removal Steps 14-23:

Required Special Tool:
^ MB992042: Water Temp Sensor Wrench

REMOVAL SERVICE POINTS

[A] RADIATOR UPPER HOSE DISCONNECTION





Make mating marks on the radiator hose and the hose clamp. Disconnect the radiator hose.

[B] FUEL HIGH-PRESSURE HOSE DISCONNECTION





1. Follow the steps below to unlock the fuel high-pressure hose connector.





1) Insert a flat-tipped screwdriver [6 mm (0.24 inch) wide and 1 mm (0.04inch) thick] into the retainer of the fuel high-pressure hose connector.

CAUTION
When pushing up the retainer of the fuel high-pressure hose connector, pay attention to avoid damage to the retainer.





2) Turn the flat-tipped screwdriver inserted into the retainer by 90 degrees to push up the retainer and unlock the fuel high-pressure hose connector.
2. Remove the fuel high-pressure hose.

[C] ENGINE COOLANT TEMPERATURE SENSOR REMOVAL





Use special tool MB992042 to remove the engine coolant temperature sensor.

INSTALLATION SERVICE POINTS

]A[ ENGINE COOLANT TEMPERATURE SENSOR INSTALLATION





1. Apply sealant to the engine coolant temperature sensor thread.
Specified sealant: Three bond 1324N or equivalent





2. Use special tool MB992042 to tighten the engine coolant temperature sensor to the specified torque.

Tightening torque: 30 ± 9 Nm (22 ± 7 ft-lb)

]B[ FUEL HIGH-PRESSURE HOSE CONNECTION

CAUTION
^ When pushing in the retainer of the fuel high-pressure hose connector, pay attention to avoid damage to the retainer.
^ After the installation of the fuel high-pressure hose, slightly pull the fuel high-pressure hose to check that it is connected securely. At this time, also check that there is approximately 1 mm (0.04inch) play.





1. Securely insert the fuel rail stopper into the fuel high-pressure hose connector groove to install the fuel high-pressure hose to the fuel rail.
2. Push in the retainer of the fuel high-pressure hose connector to lock the fuel high-pressure hose and fuel rail.

]C[ O-RING INSTALLATION

CAUTION

Avoid adhesion of engine oil or grease to the O-ring. Fit the O-ring in the water pump inlet pipe groove, wet the O-ring circumference or the pipe mounting area inner wall, and then insert the O-ring.

]D[ RADIATOR UPPER HOSE CONNECTION





1. Insert each hose as far as the projection of the water inlet fitting.
2. Align the mating marks on the radiator hose and hose clamp, and then connect the radiator hose.

INSPECTION

WATER PIPE AND HOSE CHECK
Check the water pipe and hose for cracks, damage and clogs. Replace them if necessary.