Removal and Replacement

WM 174019 Removing and installing oil/water heat exchanger

Tools





Preliminary work

1. Raise the vehicle -> 4X00IN Lifting the vehicle Service and Repair.
2. Remove front underbody panelling -> 519219 Removing and installing cover for front underbody - section on "Removing" 519219 Removing and installing Cover For Front Underbody.
3. Drain engine oil -> 170117 Draining and filling engine oil (changing engine oil) - section on "Draining" Removal and Replacement.
4. Remove front-axle support -> 400819 Removing and installing front-axle support - section on "Removing" 400819 Removing and installing front-axle support.





Reinforcement plate

Removing oil/water heat exchanger

Information

The oil/water heat exchanger is fitted at the front of the oil guide housing.





Oil/water heat exchanger, oil filter, 2WD









Oil/water heat exchanger, oil filter, 4WD





1. Vehicles with PDCC: Disconnect expansion hose -1- at the front of the auxiliary frame.





Disconnecting expansion hose

1.1. Open the clamps -2-.
1.2. Remove expansion hose and let it hang down.
2. Place a drip pan under the oil/coolant heat exchanger. (Coolant and oil will run out during disassembly.)
3. Disconnect coolant hoses.





Removing coolant hoses

3.1. Loosen the clips -1- on the coolant hoses at the oil/coolant heat exchanger and slide them onto the hoses -A-.
3.2. Clamp the hoses using hose clamp 3093 or hose clamp 3094.
3.3. Clip the coolant hose assembly -3- on the oil/coolant heat exchanger from the holder -2- ( -B- ).
3.4. Pull off the hoses -C-.
4. Unscrew fastening screws -1-.





Fastening screws for oil/water heat exchanger

5. Tilt the oil/coolant heat exchanger up in direction of travel -A-.
6. Remove the oil/coolant heat exchanger.

Installing oil/water heat exchanger

Information

The tightening specifications for the basic engine are stored centrally. -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications. Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.





Oil/water heat exchanger, oil filter, 2WD









Oil/water heat exchanger, oil filter, 4WD





- The oil/coolant heat exchanger is installed in reverse order to removal.
- Always replace the O-rings -6- between the oil/coolant heat exchanger and the oil guide housing.
- Always use the correct tightening torques -> 1001TW Tightening torques, tightening sequences, assembly overviews [1][2]Specifications.

Subsequent work

1. Secure PDCC expansion hose.
2. Install front-axle support -> 400819 Removing and installing front-axle support - section on "Installing" 400819 Removing and installing front-axle support.





Reinforcement plate

3. Install front underbody panelling -> 519219 Removing and installing cover for front underbody - section on "Installing" 519219 Removing and installing Cover For Front Underbody.
4. Fill in engine oil -> 170117 Draining and filling engine oil (changing engine oil) Removal and Replacement.
5. Check the coolant level and top up if necessary.