Contents: Engine M 110 ↡ Engine M 123 ↡
Engine M 110
Tightening the camshaft bolt (engine M 110)
1. Install the camshaft bearings into the front of the housing.
2. Install thrust washers on the front end of the camshafts, lubricate the bearings and insert the shafts from the rear of the housing.
3. Install the rear housing covers with new gaskets, insert and tighten the bolts.
4. Clean the mating surfaces of the camshaft housing and cylinder head and install the gasket on the cylinder head.
5. Lower the camshaft housing onto the head, then dip the bolts in engine oil and insert them into place along with the washers.
6. Tighten the bolts in three stages to the specified torques in the reverse order to that shown in the figure. Make sure both camshafts rotate freely. Install the gears and cam followers.
Engine M 123
1. If the oil supply pipe to the camshaft bearings was removed, install it in place and tighten the bolts.
2. Lubricate the bearing supports and insert the camshaft from the rear of the engine.
3. Place the supports on the head pins and insert the bolts.
4. Tighten the bolts evenly to the specified torque, moving from the center to the edges, then loosen the head bolts slightly and tighten them to the specified torque, again moving from the center to the edges.
5. Check the free rotation of the shaft. If it turns with difficulty, then the bolts were tightened unevenly and should be tightened again.
6. Install the thrust washer onto the front end of the camshaft.
7. If the engine is in the vehicle, install the camshaft sprocket.
(Article borrowed from the web portal MERCEDESMAN)
8. Turn the engine or camshaft, bring each cam in turn to a position in which its protrusion is facing upward, then dip the cam follower in oil and put it in place, pressing the valves down with the lever. Install the retaining spring on the clamp and pull it onto the valve follower with a screwdriver.
9. Please note that valve clearances should be adjusted after the cylinder head is installed, otherwise they will decrease after tightening the head bolts.
10. Using a feeler gauge, ensure that the axial displacement of the camshaft complies with the technical data.