PRE-RELEASE
Cylinder head, B284
| Cylinder head, B284 |
| To remove |
| 1. |
Remove the cylinder head. See Cylinder head, gasket, front or Cylinder head, gasket, rear.
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| 2. |
Remove the camshafts' bolts (A) and sprockets (B), counterholding with a fixed spanner on the camshaft flats.
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| 3. |
Remove the camshaft bearing caps by slackening the bolts (A) in stages - 1/2 to 1 turn. Note the markings on the bearing caps so that they are refitted correctly later (B).
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| 4. |
Lift out the camshafts and note the rear marking on the camshafts.
The last letters in the marking:
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| 5. |
Remove the rocker arms and tappets (A). Store them in 83 93 787 Valve stand so they do not get mixed up.
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| 6. |
Fit
32 025 053 Holder
(EN-47642) on the cylinder head.
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| 7. |
Fit the holder and cylinder head in
78 74 878 Floor stand
.
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| 8. |
Rear cylinder head (certain cars):
Remove the AIC valve (A) and pipe (B).
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| 9. |
Rear cylinder head:
Remove the bracket (A) and lifting eye (B).
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| 10. |
Remove the exhaust manifold (A).
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| 11. |
Remove the valve:
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| • |
Remove the valve cones (A) using
83 96 384 Valve spring tool
.
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Remove the valve spring washer (B) and the valve spring (C).
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Remove the valve (D)
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Remove the valve guide seal (E) using 83 94 157 Pliers, valve guide seal.
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| 12. |
Repeat the procedure to remove the other valves.
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| To fit |
| 1. |
Fit the valve:
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| • |
Fit a new valve guide seal (E) using 83 94 157 Pliers, valve guide seal.
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Fit the valve (D) (new valve if necessary). Lubricate with engine oil.
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Fit the valve spring (C) and valve spring washer (B).
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Fit the valve cones (A) using
83 96 384 Valve spring tool
.
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| 2. |
Repeat the procedure to fit the other valves.
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| 3. |
Fit the exhaust manifold (A) using new bolts and a new gasket.
Tightening torque 20 Nm (15 lbf ft)
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| 4. |
Rear cylinder head: Fit the lifting eye (A) and bracket (B).
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| 5. |
Rear cylinder head (certain cars):
Fit the AIC valve (A) and pipe (B).
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| 6. |
Remove the cylinder head from the engine stand.
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| 7. |
Remove
32 025 053 Holder
(EN-47642) from the cylinder head.
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| 8. |
Fit the tappets and rocker arms (A). Lubricate with engine oil.
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| 9. |
Lubricate the bearing seats with engine oil and position the camshafts. Use adjustment tool EN-46105-1 (old version of camshaft chain) or EN-48383-3 (new version of camshaft chain) to check that the camshafts are fitted at the correct angle. Note the rear marking on the camshafts.
The last letters in the marking:
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| 10. |
Fit the bearing caps (A) as illustrated (markings on the caps (B)).
Tightening torque 10 Nm (7 lbf ft)
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| 11. |
Fit the camshaft sprocket (B) and bolts (A) (do not fit the sprocket on the front cylinder head's intake camshaft) counterholding with an open-ended spanner on the camshaft flats.
Tightening torque: 65 Nm (48 lbf ft)
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| 12. |
Fit the cylinder head. See Cylinder head, gasket, front or Cylinder head, gasket, rear.
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