Removing and Installing Guide and Tensioning Rails
WM 154719 Removing and installing guide and tensioning rails
Preliminary work
Preliminary work
1. Remove engine.
2. Remove cover for camshaft housing.
3. Remove chain case lid.
4. Mark rolling direction of timing chain. Remove timing chain from all chain sprockets, pulling it forwards.
Information
Component overview
Timing chain with guide and tensioning rails
Component overview 1
1 - Camshaft timing gear
2 - Cheese head bolt M12 x 140
3 - Guide rails
4 - Guide rail fastening screw
5 - Timing chain; use same rolling direction when re-using.
Component overview 2
1 - Tensioning rail
2 - Threaded pegs
3 - Guide rails
4 - Threaded pegs
5 - Chain tensioner M24 x 1.5; replace sealing ring
6 - Guide rail
Replacing guide and tensioning rails
Removing guide and tensioning rails
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.
Information:
If the timing chain is to be reused, the rolling direction of the timing chain must be marked before it is removed.
1. Remove top guide rails -6- if this has not yet been done. Pull guide rail -3- and tensioning rail -1- off threaded pegs. Ensure that the spring of the tensioning rail for the oil pump drive is in the correct position in relation to the guide rail -3-.
Guide rail and tensioning rail
2. Remove guide rail -3- by loosening four fastening screws (M8 x 35).
Guide rail
3. Remove plastic lid of oil pump drive -7-. To do this, unscrew two M5 x 20 screws -8- and remove plastic lid. Remove guide rail -9- and tensioning rail -6-.
Oil pump drive
Installing guide and tensioning rails
Installing guide and tensioning rails
1. Insert guide rail -9- and tensioning rail -6-. Fit plastic lid of oil pump drive -7-. To do this, insert plastic lid and screw in two screws -8-. - Tightening torque: 4.1 ftlb.
Oil pump drive
2. Fit guide rail -3-. To do this, screw in four fastening screws (M8 x 35). - Tightening torque: 24 ftlb.
Guide rail
3. Attach guide rail -3- and tensioning rail -1- to threaded pegs. Position the spring of the tensioning rail for oil pump drive correctly on guide rail -3-. Fit top guide rails -6- when installing the timing chains.
Guide rail and tensioning rail
Subsequent work
Subsequent work
1. Install timing chain.
2. Install chain case lid.
3. Set the timing.
4. Install cover for camshaft housing.
5. Install engine.