Timing Chain

Removing and installing timing chain on 4.8-liter DFI engines

Preliminary work

1. Remove engine.
2. Remove timing-case cover.

Information

Component overview





Timing chain and sprockets

1 - Double-chain camshaft drive
2 - Camshaft sprocket
3 - Screw, M12 x 140 Tighten completely after setting timing.
4 - Deflector rail
5 - Screw, M8 x 35
6 - Camshaft-to-camshaft guide pad
A - Direction of travel

Removing timing chain

Information
If the timing chain has to be removed or replaced, check the guide and tensioning rails as well as the chain pinions for wear and scoring and replace them if necessary.

Information
The rolling direction of the timing chain must always be the same.
If the timing chain is to be reused, the rolling direction of the timing chain must be marked before it is removed.

1. Loosen the fastening screws on the camshaft timing gears and camshaft controllers (by one or two turns). To do this, counter at the hexagon on the camshaft controller and camshaft timing gear using a ring wrench.





Camshaft timing gears and camshaft controllers

2. Remove timing chain from all sprockets by pulling it forwards.

Installing timing chain

Camshaft timing gears and camshaft controllers must be fitted and it must be possible to turn them (without tilting).

Information
If the timing chain has to be removed or replaced, check the guide and tensioning rails as well as the chain pinions for wear and scoring and replace them if necessary.

1. Check that the guide and tensioning rails are installed at the correct position.

Information
The rolling direction of the timing chain must always be the same.
If the timing chain is to be reused, the rolling direction of the timing chain must be marked before it is removed.

2. Place timing chain loosely on all sprockets. Ensure that the timing chain is positioned correctly on the guide rails.

Subsequent work

1. Install timing-case cover.
2. Set the timing.
3. Install engine.