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Valve mechanism, front cylinder head, B284 (new version)

Valve mechanism, front cylinder head, B284 (new version)

To remove

Important

Store all removed valve parts in the valve stand 83 93 787.



1. Remove the Camshaft cover, front

Warning

The cooling system is under pressure. Hot coolant and steam can escape.

- Open the cap slowly to release the pressure.

- Carelessness can cause eye and burn injuries


2. Open the expansion tank cap and relieve any excess pressure.

3. Raise the car.

4. Undo the right-hand side of the spoiler shield.

5. Place a suitable receptacle under the radiator. Connect a hose (A) to the radiator and drain the coolant. Close the cock and refit the spoiler shield.


6. Remove the Starter motor, B284.

7. Remove Engine mounting, right

8. Lower the car.

9. Remove the spark plugs.

10. Remove the coolant port (A).


11. Remove the camshaft solenoid valve (695F) (B).

12. Remove the camshaft position sensor (555F) (C).

13. Rotate the crankshaft so that the markings on the camshaft sprockets are visible and the indentations align with the cylinder head. Use EN-48383-3 Adjustment tool (A) as a gauge (the camshafts are now in their neutral position).


14. Raise the car.

15. Fit EN-46106 Flywheel locking attachment (A).


16. Lower the car.

Important

Store all removed valve parts in the valve stand 83 93 787.


17. Mark the chain and camshaft sprockets so they can be refitted in the same position (A).


18. Loosen the torque on the bolts (B) holding the camshaft sprockets. Counterhold using an open spanner on the camshaft flats (do not remove the bolts).

19. Fit EN-48313 Timing chain holding tool to the timing chain. Check that the tool grips the chain securely and that the lower groove (A) of the tool aligns with the top of the cylinder head (the timing cover is removed in the illustration to better depict tool fitting).


20. Tighten EN-48313 Fixing tool manually so that the chain is unloaded. Counterhold using an open spanner so that the tool does not turn.

Important

It is vital that EN-48313 is properly fitted. If tension is not relieved from the chain when the camshaft sprocket is removed, the chain tensioner will trigger automatically. To then adjust the chain tensioner, the timing cover must be removed.


21. Remove the camshaft sprocket bolts.

22. Remove the sprockets from the camshafts.

23. Remove the camshaft bearing caps by loosening the bolts in stages - 1/2 to 1 turn. It is important that the removal ends at the bearing cap where the tappets are loaded. Note the markings on the bearing caps when refitting to ensure that they are in the correct locations (A).


24. Lift out the camshafts and note the rear marking on the camshafts. (B) The last letters in the marking: LI = intake camshaft, front cylinder bank. LE = exhaust camshaft, front cylinder bank.

Important

Cover all return oil ducts in the cylinder head so that the valve cone or contaminants cannot fall down into the engine.


25. Remove the roller rockers and the hydraulic adjuster elements (A). Store them in 83 93 787 Valve stand so they do not get mixed up.


26. Fit EN-46110 Valve spring depressor (A).


27. Fit 83 94 173 Air nipple for spark plug hole . Connect compressed air and put the piston and valves under pressure (A).


28. Press down the valve plate with EN-46110 Valve spring depressor (B).

Important

The compressed air must not be disconnected when the valve cone is removed. Do not press on the valve stem either as counterpressure in the cylinder could reduce and the valve could fall down into the cylinder.


29. Remove the valve cone with a magnet (A).


30. Lift out the spring plate and valve spring (A).


31. Lift out the valve guide seal using 83 94 157 Pliers, valve guide seal (A).



To fit


1. Clean all parts and check contact surfaces and bearing surfaces for wear.

2. Fit the valve guide seal using 83 94 157 Pliers, valve guide seal .


3. Fit the valve spring and spring plate.


4. Press down the valve plate with EN-46110 Valve spring depressor .

5. Fit the valve cone using EN-46117 Fitting tool .


6. Unload the valve and remove EN-46110 Valve spring depressor .

7. Disconnect the compressed air and remove the air nipple.

8. Position the camshafts and use EN-48383-3 Adjustment tool to check that the camshafts are mounted at the correct angle (B). The last letters in the marking: LI = intake camshaft, front cylinder bank. LE = exhaust camshaft, front cylinder bank.


9. Fit the bearing caps as illustrated (markings on caps). Start where the cams point down and load the tappets. Note: tighten the bolts in stages - 1/2 to 1 turn.

Tightening torque 10 Nm (7 lbf ft)

Important

Tighten the bolts in stages - 1/2 to 1 turn.


10. Fit the sprockets with chain on the camshafts. Tighten the bolts by hand.

11. Check that the marks on the chain match the markings on the sprockets.


12. Remove EN-48313 Fixing tool.

13. Tighten the bolts of both camshaft sprockets (B), counterholding with an open spanner on the camshaft flats.

Tightening torque: 65 Nm (48 lbf ft)

14. Fit the camshaft position sensor (555F) using a new gasket (C).

Tightening torque 10 Nm (7 lbf ft)


15. Fit the camshaft solenoid valve (695F) using a new seal (B).

Tightening torque: 10 Nm (7 lbf ft)

16. Fit the coolant port using a new seal and gasket (A).

Tightening torque: 10 Nm (7 lbf ft)

17. Fit the spark plugs.

18. Fit Engine mounting, right .

19. Raise the car.

20. Remove EN-46106 Flywheel locking attachment (A).


21. Fit the Starter motor, B284 .

22. Lower the car.

23. Fit the Camshaft cover, front .

24. Charge and bleed the cooling system. See Bleeding and charging the cooling system .