Overhaul

WM 174019 Removing and installing oil/coolant heat exchanger (oil cooler) on 4.8-liter DFI engines








Preliminary work

1. Remove the radiator frame.
2. Remove underbody panelling under the engine.

Information

Component overview





Oil/coolant heat exchanger (oil cooler)

1 - Oil guide housing
2 - Oil-filter housing - Tightening torque: 25 Nm (19 ftlb.);
3 - Oil filter
4 - Oil-filter sealing ring
5 - Oil duct adapter (cannot be replaced)
6 - Heat exchanger seal
7 - Oil/coolant heat exchanger
8 - Screw, M6 x 20; self-tapping screws ex-works; metric screws can also be used - Tightening torque: 10 Nm (7.5 ftlb.);
A - Direction of travel

Removing oil/coolant heat exchanger (oil cooler)

1. On vehicles with PDCC, loosen the hoses on the oil guide housing.
1.1. Remove two nuts. -arrows-





PDCC lines

1.2. Unclip line under the air conditioning compressor -arrow-. Lift the lines aside.





Unclipping PDCC line

2. Place a collection pan under the oil/coolant heat exchanger (oil cooler). Coolant and oil will run out during disassembly.
3. Loosen the clips on the coolant hoses at the oil/coolant heat exchanger and slide them onto the hoses -1 and 2-.





Oil cooler

3.1. Clamp the hoses using hose clamp 3093 or hose clamp 3094.
3.2. Pull off the hoses.
4. Unclip the coolant hose assembly on the oil/coolant heat exchanger (oil cooler) from the holder. -6-





Coolant return line

1 - Coolant pipe
2 - Coolant hose
3 - Holder
4 - Screw, M6 x 12
5 - Screw, M6 x 20
6 - Tab on oil/coolant heat exchanger
B - Clip on to support bracket
A - Direction of travel

5. Loosen the fastening screws on the heat exchanger evenly -8- and pull the heat exchanger down and off. During this process, both engine oil and coolant will leak out. Collect emerging oil and coolant and dispose of in accordance with legal requirements.





Oil/coolant heat exchanger (oil cooler)

1 - Oil guide housing
2 - Oil-filter housing
3 - Oil filter
4 - Oil-filter sealing ring
5 - Oil duct adapter (cannot be replaced)
6 - Heat exchanger seal
7 - Oil/coolant heat exchanger
8 - Screw, M6 x 20; self-tapping screws ex-works; metric screws can also be used
A - Direction of travel

6. Remove seals. -6- Clean sealing faces.

Installing oil/coolant heat exchanger (oil cooler)

1. Replace the two sealing rings.





Oil/coolant heat exchanger (oil cooler)

1 - Oil guide housing
2 - Oil-filter housing - Tightening torque: 25 Nm (19 ftlb.)
3 - Oil filter
4 - Oil-filter sealing ring
5 - Oil duct adapter (cannot be replaced)
6 - Heat exchanger seal
7 - Oil/coolant heat exchanger
8 - Screw, M6 x 20; self-tapping screws ex-works; metric screws can also be used - Tightening torque: 10 Nm (7.5 ftlb.)
A - Direction of travel

1.1. Then move the oil/coolant heat exchanger into installation position and fit the fastening screws (turn screws by hand initially). The old self-tapping screws can be re-used. Tighten screws evenly and diagonally.
2. Clip the coolant hose assembly into to the oil/coolant heat exchanger (oil cooler).
3. Fit the coolant hoses on the oil/coolant heat exchanger and remove the hose clamps.





Oil cooler

4. On vehicles with PDCC, secure the hoses on the oil guide housing. - Tightening torque: 10 Nm (7.5 ftlb.)





PDCC lines

Subsequent work

1. Fit radiator frame.
2. Fit underbody panelling.
3. Check and correct the engine-oil level.
4. Check and correct the engine-oil level