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Valve gear (in car)

Valve gear (in car)


To remove



1. Remove the upper engine cover. Unplug the electrical connection and remove the ignition discharge module and the spark plug. Undo the screw of the crankcase ventilation pipe on the camshaft cover and remove the banjo nipple for crankcase ventilation and the vacuum hose from the camshaft cover. Remove the camshaft cover.

2. Rotate the crankshaft to the 0 mark, remove the chain tensioner and the camshafts. Cover the space for the sprockets and timing chain to prevent collets and seals from dropping down inside.


Important

Keep all dismantled valve gear parts in valve stand 83 93 787.


3. Lift out the tappets, using 83 91 401 Magnetic tool .

4. Fit 83 93 746 Protective collar around the valve springs to protect the tappet sliding surfaces. Note the position of the collar.

5. Rotate the crankshaft until the piston in the cylinder concerned is at top dead centre. Lock the engine using 83 94 868 Flywheel locking segment and fit 83 94 173 Air nipple . Connect the compressed air and pressurize the piston and valves.


6. Press down the valve disc with 83 95 246 Valve spring compressor and remove the collets.


7. Lift out the spring cap and valve spring and remove the washer with valve guide seal using 83 94 157 Pliers, valve guide seal .


To fit



1. Fit the washer with valve seal using 83 94 157 Pliers, valve guide seal

2. Fit the spring and spring cap and fit the collets in the spring cap's groove.


3. Disconnect the compressed air, remove the air nipple and the flywheel locking segment.

4. Turn the crankshaft to the 0 marking and then 45°.

5. Remove the protective sleeves and fit the valve tappets.


6. Fit the camshafts and bearing caps, starting where the cams point downwards and press on the tappets. Bearing caps marked 1-5 for the inlet side, 6-10 for the exhaust side.

Tightening torque 15 Nm (11 lbf ft)

Important

The black bolts have an oilway and should be fitted on the spark plug side.


7. Line up the marks on the camshaft with their timing marks and turn the crankshaft back to the 0 mark.

8. Fit the camshaft sprockets and chain. Start with the inlet side camshaft. Do not tighten the bolts yet!


9. Prepare the chain tensioner for mounting by pressing down the catch and pressing in the chain tensioner.

10. Fit the chain tensioner, using a 27 mm socket.

Tightening torque 63 Nm (47 lbf ft)

11. Fit the chain tensioner plug with push rod and spring.

Tightening torque: 22 Nm (16 lbf ft)

12. Check that the chain runs correctly on the chain guides. Rotate the crankshaft two turns and check the settings of the flywheel and camshafts. Tighten the camshaft sprocket bolts.

Tightening torque 63 Nm (47 lbf ft)

13. Clean the sealing surface of the camshaft cover with benzene.


14. Apply a soap solution to the opening in the camshaft cover and fit the cover, starting at the opening end. Then continue all the way round, on both the inside and outside.

Tightening torque 15 Nm (11 lbf ft)

15. Fit the nipple for crankcase ventilation and vacuum for the camshaft cover. Refit the bolt securing the crankcase breather pipe on the camshaft cover.

16. Fit the spark plugs.

Tightening torque: 28 Nm (21 lbf ft)

17. Fit the ignition discharge module.

Tightening torque: 11 Nm (8 lbf ft)

18. Plug in the ignition discharge module's connector.