Removal
When installing a new chain, keep both chain runs taut at all times.
Unscrewing the cap nut from the drive chain tensioner housing
(Material created based on the website: Mercedesman.ru)
Removal the spring and sealing ring from the drive chain tensioner mechanism
Drive chain tensioning mechanism
1 – cap nut; 2 – sealing ring; 3 – spring; 4 – bracket; 5 – plunger; 6 – body
Direction of removing the plunger with the bracket from the housing of the drive chain tensioning mechanism
1 – body; 2 – plunger; 3 – bracket
1. Remove the ground cable from the battery.
2. Remove the auxiliary drive belt.
3. To improve access to the drive chain tensioner mechanism, remove the generator.
4. On the right front side of the engine, unscrew the cap nut from the drive chain tensioner housing and remove the spring and sealing ring (see fig. Unscrewing the cap nut from the drive chain tensioner housing, Removing the spring and sealing ring from the drive chain tensioner).
Caution: Be careful when unscrewing the cap nut, as the nut is subject to a highly compressed spring.
5. Unscrew the timing chain tensioner housing from the engine block (see fig. Drive chain tensioning mechanism).
6. Remove the plunger with the bracket from the drive chain tensioner housing (see fig. Direction of removing the plunger with the bracket from the housing of the drive chain tensioning mechanism).
Replacement
1. Clean the drive chain tensioner components and check the plunger and housing for wear.
2. Check the condition of the tensioner bracket and spring and replace them if necessary.
Installation
Location of the plunger in the housing of the drive chain tensioning mechanism
1 – plunger position during installation;
2 – direction of plunger extraction from the housing
1. Screw the timing chain tensioner housing into the cylinder block and tighten it to the specified torque.
2. Insert the plunger with the bracket into the housing of the drive belt tensioner until the bracket stops against the flange of the inner cavity of the housing (see fig. Location of plunger in the housing of the drive chain tensioning mechanism).
3. Insert the spring into the housing, install a new sealing ring on the cap nut and, overcoming the resistance of the spring, screw on the cap nut and tighten it to the required torque.
4. Install the generator.
5. Install the auxiliary drive belt.
6. Connect the ground wire to the battery.