Valve timing
A - mark on the camshaft
B - mark on the crankshaft pulley
1 - fixed mark
2 - movable mark
Removing
This operation is performed on the engine removed from the vehicle each time the camshaft drive chain is removed (for removing the cylinder head and camshaft), except for replacing the chain.
Blocking from turning the camshaft of the engine M 102
1. Turn away screws of fastening of a cover of the distributor of ignition.
2. Disconnect the high voltage wires from the spark plugs.
3. Remove the cylinder head cover with high voltage wires and the ignition distributor cover.
Note. If the cylinder head cover is difficult to remove, do not hit it with a hammer to avoid cracking. Pry off the cover carefully.
4. Remove the distributor rotor, drive plate and interference suppression cover.
5. Turn away bolts of fastening of the top cover of a drive of a camshaft. Remove the cover gasket.
6. Remove the top cover by hitting the camshaft axis with a wooden mallet.
7. Turn the crankshaft until the piston of the 1st cylinder reaches TDC.
8. Unscrew the screw plug of the chain tensioner. Remove the O-ring and spring.
Attention! Unscrew the screw plug with care to avoid spring ejection.
9. Remove the bottom ring.
10. Remove tensioner.
11. For simplification of cranking of a cranked shaft turn out spark plugs.
12. Make sure that the crankshaft is still in the position corresponding to the TDC of the piston of the 1st cylinder (the fixed protrusion should be opposite the movable mark - see illustration Adjusting the gas distribution).
13. Check if the movable mark on the camshaft matches (holes in the collar) and a fixed mark on the cylinder head.
14. Remove the crankcase.
15. Block the flywheel from turning.
16. Remove the crankshaft pulley with damper by unscrewing the central bolt.
17. Remove the cup washers.
18. Remove the timing cover.
19. Mark with paint the relative position of the chain and sprockets of the crankshaft and camshaft.
20. Mark the camshaft sprocket and the shaft itself.
21. Remove the chain guide with an inertial puller.
22. Remove the camshaft sprocket by unscrewing the mounting bolts.
23. Loosen the oil pump drive chain and remove it.
24. Remove the camshaft drive chain.
Installation
1. Make sure the crankshaft and camshaft are in the camshaft position.
2. Put the chain on the camshaft sprocket, ensuring that the marks match.
3. Install the sprocket on the camshaft, making sure the marks match.
4. Install the chain guide.
5. Fit the oil pump drive chain.
6. In the future, installation is carried out in the reverse order of removal.
7. Fill in oil and coolant.
8. Remove air from the cooling system.