Timing chain drive diagram and stages of the valve timing installation procedure. In-line petrol engine 111.
Special tools:
- Camshaft locking tool - No.111589031500.
- Camshaft key - No.111589014000.
- Crankshaft Pulley/Hub Puller - No.000589883300.
- Crankshaft sprocket puller - No.615589013300.
- Flywheel locking tool - No.601589024000.
- Bolts for fixing the flywheel lock - M6 x 90 mm.
- Devices for fixing the chain on the camshaft sprockets - No.111589196100.
- Chain Maintenance Tool Kit - #602589024000.
- Timing chain link separator (element 1) - No.602589023300.
- Timing chain link separator (element 2) - No.602589056300.
- Timing chain link separator (element 3) - No.602589056301.
- Chain link joining tool - No.602589003900.
- Set of dies for joining chain links - No.112589096300.
- Tool box - No.602589009800.
- Viscous coupling pulley holder (type 1) - No.119589024000.
- Viscous coupling pulley holder (type 2) - No.120589020100.
- Viscous coupling locking key - No.111589020100.
General precautions
1. Disconnect the negative cable from the battery.
2. Remove the spark plugs to make it easier to turn the engine.
3. Unless otherwise stated, turn the engine only in the normal direction.
4. Familiarize yourself with the requirements for tightening forces of threaded connections.
5. If equipped, mark the position of the CKP sensor before removing it.
6. Do not turn the crankshaft using the camshaft drive sprockets or other devices.
7. Do not turn the crankshaft and camshafts with the timing chain removed.
Valve timing installation procedures
Note: The timing chain can be replaced without removing the engine. Using the tools listed below, the new chain can be connected to the old one, placed on the sprockets and riveted.
The viscous coupling nut has a left-hand thread.
The bolts securing the intake camshaft adjuster and the exhaust camshaft sprocket [9] must be replaced without fail.
1. Bring the piston of the first cylinder [1] to the position 20° after TDC.
2. Make sure that the cams of the valve drive of the first cylinder of both camshafts are turned with the working projections upward.
3. Install the locking devices [2] on the camshafts.
Note: If necessary, slightly adjust the crankshaft position within the permissible ranges (20÷30° ATDC when locking the intake camshaft and 25÷35° ATDC when locking the exhaust camshaft) to facilitate installation of the locking devices. Remember that turning the camshaft sprocket by one tooth results in a crankshaft shift of approximately 20°.
Original can be found on the website (MercedesMan)
4. On engines with adjustable intake camshaft, ensure that the adjuster tabs remain in the "retard" position [3] during chain replacement.
Attention! Failure to assemble correctly may result in internal engine damage as a result of valves hitting the piston bottoms!
5. Before starting the repair procedures, loosen the tensioner nut [4] by one turn and remove the tensioner assembly from the engine.
6. Loosen the tensioner spring nut [4], remove the pin [5] and spring [6], then press the plunger [7] in the tensioner body [8] in the direction indicated by the arrow. Check the condition of the tensioner components, replace defective elements.
7. Install the tensioner on the engine and tighten its fasteners to the required torque (80 Nm). Place the plunger [7], spring [6] and pin [5] into the housing [8]. Screw on the nut [4] and tighten it to a torque of 40 Nm.
8. Lubricate the crankshaft pulley centre bolt and its washer. Screw in the bolt and tighten it to the required torque [10].