Removal and Replacement
WM 101055 Replacing crankcase
Preliminary work
Preliminary work
1. Remove engine.
2. Remove wire harness for engine.
3. Remove the generator.
4. Remove power-steering pump.
5. Remove left additional assembly bracket -2- and right engine carrier -8-. There are still two dowel sleeves (not shown) on the additional assembly bracket.
Removing and installing engine support
1 - Nut - Tightening torque: 75 Nm (56 ftlb.)
2 - Additional assembly bracket, left
3 - Screw x 10 - Tightening torque: 65 Nm (48 ftlb.)
4 - Hydraulic mount, left
5 - Engine carrier
6 - Screw x 4 - Tightening torque: 60 Nm (44 ftlb.)
7 - Hydraulic mount, right
8 - Engine carrier
9 - Screw x 6 - Tightening torque: 65 Nm (48 ftlb.)
6. Remove starter.
7. Remove knock sensors.
8. Remove cylinder heads.
9. Remove water pump.
10. Remove coolant regulator.
11. Remove guide and tensioning rails.
12. Remove crankshaft.
13. Remove oil spray jets on turbo engine and cap on naturally aspirated engine.
Information
Component overview
Upper crankcase section assembly
1 - Crankcase, top
2 - Closure cap
3 - Seal
4 - Closure cap
5 - Screw - Tightening torque: 10 Nm (7.5 ftlb.)
6 - Screw plug - Tightening torque: 10 Nm (7.5 ftlb.)
7 - Sealing ring
8 - Sealing ring (not marked in illustration)
9 - Screw plug - Tightening torque: 75 Nm (56 ftlb.)
10 - Oil spray jets on turbo engine and cap on naturally aspirated engine
11 - Dowel sleeves
Replacing crankcase
Replacing crankcase
Caution:
Old pistons used in new crankcase
Unacceptably large piston dimension
Danger of piston and cylinder sleeve seizure
- Always replace the pistons and piston rings when replacing the crankcase.
Caution:
Leaks due to components being at too low a temperature or at different temperatures!
If components that are cold or at different temperatures are sealed together by the application of sealant, adhesion problems and leaks can arise due to the build-up of condensation water or component distortion.
- Components must have reached at least 17°C throughout.
- Components must not be too hot (distortion).
- Spare parts that are stored in the cold or heat (strong sunlight), must be brought to room temperature or the same temperature as other parts before installation.
Information:
The bearing shells of the main and connecting-rod bearings must be replaced on vehicles with high mileage.
1. Remove coolant guide. To do this, remove 10 screws -arrows-.
Coolant pipe
Component overview for coolant guide
Coolant guide
1 - Distributor pipe
2 - Temperature sensor
3 - Sealing ring
4 - Screw plug - Tightening torque: 30 Nm (22 ftlb.)
5 - Fastening screws on distributor pipe - Tightening torque: 10 Nm (7.5 ftlb)
6 - Gasket; replace
7 - Sealing ring; check and replace if necessary
8 - Coolant pipe
2. Remove coolant guide and remove seals. Clean sealing surfaces.
3. Re-fit crankcase. When doing so, watch out for dowel sleeves and studs.
4. Fit coolant guide with new seals.
Subsequent work
Subsequent work
1. Assemble engine.
2. Install engine.