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Timing Cover: Service and Repair


WM 153319 Removing and installing timing-case cover on V6 DFI engines

Tools





Technical values






Preliminary work

Preliminary work for removing upper timing-case cover

1. Remove intake-air distributor. => 244619 Removing and installing intake-air distributor - section on "Removing"
2. Remove bar ignition modules. => 282020 Removing and installing DFI bar ignition modules - section on "Removing"
3. Remove cylinder head cover.=> 158219 Removing and installing cylinder head cover on V6 DFI engines - section on "Removing"
4. Remove accessories from upper timing-case cover.
4.1. Remove rear engine cable carrier.
4.2. Pull off connector for camshaft controller hydraulic valves.=> 153719 Removing and installing hydraulic valve for camshaft control on V6 DFI engines - section on "Removing"
4.3. Pull off connector for camshaft hall senders - 2 -.=> 283919 Removing and installing hall senders (camshafts) on DFI engines - section on "Removing"
Do not remove camshaft hall senders.
4.4. Remove tank vent from timing-case cover.
4.5. Pull off hose for vacuum pump and unscrew the fastening screws - 3 -.
Then carefully pull the vacuum pump - 1 - out of its guide.





Installation position of vacuum pump

4.6. Remove sheetmetal holder for additional coolant pump - 2 - and press the hose assembly aside.





Sheetmetal holder for additional coolant pump

Preliminary work for removing lower timing-case cover

1. Remove engine.=> 100119 Removing and installing 3.6-litre DFI engine - section on "Removing"
2. Remove transmission
2.1. For vehicles with manual transmission, see:=> 343519 Removing and installing transmission - section on "Removing"
2.1.1. Remove flywheel.=> 136019 Removing and installing flywheel (DMF) on DFI engines - section on "Removing"
2.2. For vehicles with automatic transmission, see:=> 373519 Removing and installing transmission - section on "Removing"
2.2.1. Remove drive plate for torque converter.=> 136319 Removing and installing drive plate for torque converter on DFI engines - section on "Removing"





Drive plate

3. Remove oil pan.=> 175019 Removing and installing oil pan on V6 DFI engines - section on "Removing"

Information

Component overview

Upper timing-case cover





Upper timing-case cover with vacuum pump





Lower timing-case cover





Cylinder block and lower timing-case cover






Removing upper timing-case cover

CAUTION

Do not turn crankshaft against the running direction of the engine.

- Risk of engine damage.

-> Proceed with extreme care while working.
-> Never turn the crankshaft against the running direction of the engine when the timing chains are fitted.
-> Always turn the engine at the crankshaft and at the camshaft.
-> After working on the camshaft, the timing must be set again.

1. Remove upper timing-case cover.





Upper timing-case cover

1.1. Do not remove camshaft hall senders.
1.2. Unscrew fastening screws - 2 - for the upper timing-case cover.
1.3. Detach securely bonded timing-case cover by knocking carefully with a rubber hammer.
1.4. Clean sealing faces on engine block, timing-case cover and cylinder head gasket.
1.5. Check sealing rings on camshaft controller hydraulic valves.
If the sealing rings are damaged, place the timing-case cover on a level surface and drive out the rings using a socket-wrench insert socket-wrench insert 9714 ( => Socket-wrench insert (9714) ).
Fit new sealing rings using the pressure sleeve pressure sleeve T10174 ( => Pressure sleeve (T10174) ).





Socket-wrench insert (9714)





Pressure sleeve (T10174)

Removing lower timing-case cover

NOTICE

Incorrect handling of crankshafts

- Risk of damage to the timing system

-> Never turn the crankshaft against the rolling direction or when the chain tensioner is removed.
-> Proceed carefully with your work.
-> Only turn the engine at the crankshaft.
-> Reset the timing after working on the camshaft.
-> Observe general warning notes and working regulations.

Information

- If a crankshaft stub is dirty or slightly rusted, this will damage the new sealing ring when it is fitted.

- The crankshaft stub must be cleaned before the old sealing ring is removed so that no particles of dirt can get into the engine.

- Use a metal-polishing pad (e.g. Never Dull) for this.

1. Remove and replace crankshaft sealing ring.=> 135919 Removing and installing sealing ring for crankshaft flywheel on V6 DFI engines - section on "Removing"
2. Remove lower timing-case cover.
2.1. Unscrew fastening screws on the timing-case cover. All screws are shown in grey in the illustration => Lower timing-case cover. Don't forget the top two M8 screws for the cylinder head -1-.





Lower timing-case cover

2.2. Detach securely bonded timing-case cover by knocking carefully with a rubber hammer.
2.3. Clean sealing faces on engine block, crankshaft and timing-case cover thoroughly.

Installing upper timing-case cover

CAUTION

Leaks due to insufficiently or differently tempered components.

- If cold or differently tempered components are sealed to each other by applying a sealant, adhesion problems or leaks can result because of condensed water forming or components becoming distorted.

-> All components must be at least 17°C.
-> Components must not be too hot (distortion).
-> Make sure spare parts are at the same temperature before installation >> ideally room temperature 20°C.

1. Apply a thin coating of sealing compound to the sealing faces of the upper timing-case cover.
1.1. Seal face between upper timing-case cover and cylinder head cover.
1.2. Tighten fastening screws - 2 - for timing-case cover by hand.
1.3. Tighten fastening screws - 2 - => Tightening torque: 10 Nm (7.5 ftlb.) for the timing-case cover.





Upper timing-case cover

Installing lower timing-case cover

Information

If cold or excessively low-tempered components are sealed to each other by applying sealant, leaks can occur because of condensed water forming or components distorting. Components must be uniformly at least => Temperature: 17°C.

1. Apply sealing compound to the sealing faces of the lower timing-case cover.
1.1. Seal face between timing-case cover and cylinder head gasket.
1.2. The area between the timing-case cover and the oil pan is not sealed until the oil pan is installed (section on Subsequent work).
1.3. Seal the area between the timing-case cover and engine block => Applying sealing compound.





Applying sealing compound

2. Carefully place timing-case cover on the engine block. When positioning the timing-case cover, make sure that the sealing compound is not displaced by the cylinder head gasket.
3. Fit and then tighten fastening screws for the timing-case cover.
3.1. Tighten fastening screws - 1 - between the lower timing-case cover and cylinder head=> Tightening torque: 23 Nm (17 ftlb.).





Fastening screws

3.2. Tighten fastening screws between the timing-case cover and crankcase=> Tightening torque: 10 Nm (7.5 ftlb.).
4. Replace crankshaft sealing ring on flywheel side. => 135919 Removing and installing sealing ring for crankshaft flywheel on V6 DFI engines - section on "Installing"





Crankshaft sealing ring

Subsequent work

Subsequent work for upper timing-case cover

1. Fit accessories for upper timing-case cover.
1.1. Fit sheetmetal holder for additional coolant pump.
1.2. Fit vacuum pump together with vacuum hose.
1.3. Fit tank vent.
1.4. Fit connector for camshaft hall senders.=> 283919 Removing and installing hall senders (camshafts) on DFI engines - section on "Installing"
1.5. Fit connector for camshaft controller hydraulic valves.=> 153719 Removing and installing hydraulic valve for camshaft control on V6 DFI engines - section on "Installing"
1.6. Fit engine cable carrier and replace the tie-wraps if necessary.
2. Fit cylinder head cover.=> 158219 Removing and installing cylinder head cover on V6 DFI engines - section on "Installing"
3. Fit bar ignition modules.=> 282020 Removing and installing bar ignition modules on DFI engines - section on "Installing"
4. Install intake-air distributor. => 244619 Removing and installing intake-air distributor - section on "Installing"

Subsequent work for lower timing-case cover

1. Install oil pan.=> 175019 Removing and installing oil pan on V6 DFI engines - section on "Installing"
2. Mount transmission.
2.1. Install flywheel on vehicles with manual transmission.=> 136019 Removing and installing flywheel (DMF) on DFI engines - section on "Installing"
2.1.1. Refit manual transmission.=> 343519 Removing and installing transmission - section on "Installing"
2.2. Install drive plate for torque converter on vehicles with automatic transmission.=> 136319 Removing and installing drive plate for torque converter on DFI engines - section on "Installing"
2.2.1. Refit automatic transmission.
=> 373519 Removing and installing transmission - section on "Installing"
3. Install engine.=> 100119 Removing and installing V8 4.8-litre DFI engine - section on "Installing"
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