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

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

To remove

Important

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



1. Remove the Camshaft cover, front

2. Remove the spark plugs.

3. Remove the coolant port.


4. Remove the camshaft solenoid valve (695F).

5. Remove the camshaft position sensor (555F).

6. Rotate the crankshaft so that the markings on the camshaft sprockets are visible and the indentations align with the cylinder head. Use EN-46105-1 Adjustment tool as a gauge (the camshafts are now in their neutral position).



7. Fit EN-46106 Flywheel locking attachment .


8. Mark the chain and camshaft sprocket so they can be refitted in the same position.

9. Reduce the tightening torque of the bolts holding the camshaft sprockets. Counterhold using an open spanner on the camshaft flats (do not remove the bolts).


10. Fit EN-46108-1 Fixing tool to the camshaft chain on the intake side. Check that the tool grips the chain firmly.

11. Fit EN-46108-2 Fixing tool to the camshaft chain on the exhaust side. Check that the tool grips the chain firmly.

12. Tighten EN-46108 Fixing tool so that the chain is unloaded.

Important

It is extremely important that tool no. EN-46108 is properly fitted. If the chain is not unloaded when the camshaft sprocket bolts are removed, the automatic chain tensioner is triggered. If this occurs, the timing cover must be removed to adjust the chain tensioner.


13. Remove the camshaft sprocket bolts.

14. Remove the sprockets from the camshafts.

15. Remove the camshaft bearing caps by loosening the bolts in stages - 1/2 to 1 turn. It is important that 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 spots.


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

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

Important

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



18. Fit EN-46110-eu Valve spring tool


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


20. Press down the valve plate with EN-46110-eu Valve spring tool .

21. Remove the valve cone with a magnet.

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.



22. Lift out the spring plate and valve spring.


23. Lift out the valve guide seal using 83 94 157 Pliers, valve guide seal .



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-eu Valve spring tool .

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

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


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

8. Position the camshafts and use EN-46105 Adjustment tool to check that the camshafts are mounted at the correct angle. 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-46108-2 Fixing tool .

13. Remove EN-46108-1 Fixing tool .


14. Tighten the bolts of both camshaft sprockets, counterholding with an open spanner on the camshaft flats.

Tightening torque: 65 Nm (48 lbf ft)

15. Remove EN-46106 Flywheel locking attachment .

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

Tightening torque 10 Nm (7 lbf ft)

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

Tightening torque 10 Nm (7 lbf ft)


18. Fit the coolant port using a new seal and gasket.

Tightening torque 10 Nm (7 lbf ft)

19. Fit the spark plugs.

20. Fit the Camshaft cover, front