Caution: When installing the tensioner cap nut, a new sealing ring must be used.
Installing a new chain
When installing a new chain, keep the chain strands taut at all times.
A - new drive chain; B - old drive chain; C – camshaft sprocket that controls the exhaust valves
Original published on the website: mercedesman
Drive chain tensioning mechanism
A – cork;
B – sealing ring;
C – pin;
D – spring;
E – bracket;
F – plunger;
G – case;
H – sealing ring
Removal
Unscrewing the plug of the drive chain tensioning mechanism
Unscrewing the drive chain tensioner assembly
1. Remove the ground cable from the battery.
2. Unscrew the bolts and remove the radiator fan impeller.
3. Remove the auxiliary drive belt.
4. If present, remove the air pump.
5. Cover the generator with a clean cloth.
6. Loosen the chain tensioner plug one turn (see fig. Unscrewing the plug of the drive chain tensioning mechanism).
7. Unscrew the drive chain tensioner assembly from the engine (see fig. Unscrewing the drive chain tensioner assembly).
8. Unscrew the cover and remove the pin and spring from the tensioner housing.
9. Press the plunger with the bracket out of the tensioner housing.
Examination
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
1. Screw the timing chain tensioner housing with a new sealing ring into the cylinder block and tighten to the specified torque.
2. Insert the plunger with the bracket into the tensioner housing, then install the spring and pin.
3. Screw the plug with a new sealing ring into the tensioner housing and tighten it to the required torque.
4. If available, install an air pump.
5. Install the auxiliary drive belt.
6. Install the radiator fan impeller.
7. Connect the ground wire to the battery.