Timing Chain Guide: Service and Repair

WM 154719 Removing and installing guide and tensioning rails

Preliminary work

1. Remove timing chain. -> 153519 Removing and installing timing chains Service and Repair

Removing guide and tensioning rails

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 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. Remove top guide rails (guide pad) between the camshafts if you have not already done so -6-.





Timing chain and sprockets





2. Pull tensioning rail off the threaded peg. -4-





Timing chain and chain guide





3. Carefully slacken the lower tensioning rail for the oil pump chain. Press the tensioning rail back with a small screwdriver until both staking holes between the tensioning rail and guide rail are aligned. => Oil pump tensioning rail





Oil pump tensioning rail

4. Stake tensioning rail for oil pump chain through the hole in the guide rail using a suitable drill bit, drift punch or nail. This slackens the oil pump chain. => Staking tensioning rail for oil pump chain





Staking tensioning rail for oil pump chain

5. Remove guide rail -3-. Guide rail for oil pump chain is locked with -6-.





Guide rail

6. Remove deflector rail -4- by loosening the fastening screws -5-.





Timing chain and sprockets





Installing guide and tensioning rails

Information

The tightening specifications for the basic engine are stored centrally. -> 1001IN Tightening torques, tightening sequences, assembly overviews [1][2]Specifications. Tightening torques and assembly instructions for other assemblies (e.g. chassis, electrics, transmission or body) or for peripheral engine equipment can be found in the corresponding documents.

1. Fit deflector rail -4- by fitting the fastening screws -5-.





Timing chain and sprockets





2. Fit the guide rail -3-. The small tensioning rail is locked on the guide rail with -6-. Slide the guide rail onto the threaded peg and move it into the correct installation position with respect to the fitted oil pump drive chain. Pull the locking pin (the tensioning rail becomes attached).





Guide rail

3. Slide the tensioning rail onto the threaded peg. -4-





Timing chain and chain guide





4. Fit top guide rails (guide pad) between the camshafts if you have not already done so -6-.





Timing chain and sprockets





Subsequent work

1. Install timing chain. -> 153519 Removing and installing timing chains Service and Repair
2. Install timing-case cover. -> 153319 Removing and installing timing-case cover Service and Repair
3. Set the timing. -> 150516 Setting timing for camshafts Procedures