Engine M 110
Camshaft Bolt Tightening (engine M 110)
1. Install the camshaft bearings in the front of the casing.
2. Install thrust washers on the front end of the camshafts, lubricate the bearings and insert the shafts from the back of the casing.
3. Install rear housing covers with new gaskets, insert and tighten bolts.
4. Clear mating surfaces of a casing of a camshaft and a head of cylinders and establish a lining on a head of cylinders.
5. Lower the camshaft housing onto the head, then dip the bolts in the engine oil and push them into place along with the washers.
6. Tighten the bolts in three steps to the prescribed torques in the reverse order to that shown in the figure. Check that both camshafts rotate freely. Install 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. Grease bearings of support and insert a camshaft from the back party of the engine.
3. Mount supports on head pins and insert bolts.
4. Tighten the bolts evenly to the specified torque, moving from the center outwards, then slightly loosen the head bolts and tighten them to the specified torque, again moving outward from the center.
5. Check the free rotation of the shaft. If it turns with difficulty, then the bolts were tightened unevenly and the tightening should be repeated.
6. Install the thrust washer on the front end of the camshaft.
7. If the engine is on the vehicle, install the camshaft sprocket.
8. Turning the engine or camshaft, bring each cam in turn to the position in which its protrusion is facing up, then dip the cam follower in oil and put it in place, squeezing the valves down with the lever. Install the retaining spring on the clamp and tighten it on the valve lifter with a screwdriver.
9. Keep in mind that valve clearances must be adjusted after the cylinder head is installed, otherwise they will decrease after tightening the head bolts.
10. Using a feeler gauge, check that the camshaft axial displacement is within specifications.