Camshafts in situ, rear cylinder head, B284 (new version)
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Camshafts in situ, rear cylinder head, B284 (new version)
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Important
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Store all removed valve parts in the valve stand 83 93 787.
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2.
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Remove the spark plugs.
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3.
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Remove the camshaft solenoid valve (695R) (A).
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4.
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Remove the camshaft position sensor (555R) (B).
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5.
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Rotate the engine so that the markings on the camshaft sprockets are visible and the indentations align with the cylinder head. Use
EN-48383-3 Adjustment tool
as a gauge (the camshafts are now in their neutral position).
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10.
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Mark the chain and camshaft sprockets so they can be refitted in the same position (A).
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11.
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Slightly loosen the bolts holding the camshaft sprockets. Counterhold using an open spanner on the camshaft flats (do not remove the bolts) (B).
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12.
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Fit
EN-48313 Timing chain holding tool
to the timing chain. Check that the tool grips the chain (B) securely and that the upper groove (B) of the tool aligns with the top of the cylinder head (the timing cover is removed in the illustration to better depict tool fitting).
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13.
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Tighten EN-48313 Fixing tool manually so that the chain is unloaded. Counterhold using an open spanner so that the tool does not turn.
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Important
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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.
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14.
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Remove the camshaft sprocket bolts.
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15.
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Remove the sprockets from the camshafts.
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16.
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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).
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17.
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Lift out the camshafts and note the rear marking on the camshafts (B). The last letters in the marking:
RI = intake camshaft, rear cylinder bank
RE = exhaust camshaft, rear cylinder bank
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1.
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Position the camshafts and use EN 48383-3 to check that the camshafts are mounted at the correct angle (B).
Last letters in the marking:
RI = intake camshaft, rear cylinder bank
RE = exhaust camshaft, rear cylinder bank
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2.
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Fit the bearing caps as illustrated (markings on caps). Start where the cams point down and load the tappets.
Tightening torque 10 Nm (7 lbf ft)
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Important
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Tighten the bolts in stages - 1/2 to 1 turn.
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3.
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Fit the sprockets with chain on the camshafts. Tighten the bolts by hand.
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4.
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Check that the markings on the chain match the markings on the sprockets (A).
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5.
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Remove EN-48313 Fixing tool.
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6.
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Tighten the bolts of both camshaft sprockets (B), counterholding with an open spanner on the camshaft flats.
Tightening torque: 65 Nm (48 lbf ft)
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7.
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Fit the camshaft position sensor (555R) using a new gasket. (B)
Tightening torque 10 Nm (7 lbf ft)
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8.
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Fit the camshaft solenoid valve (695R) using a new seal (A).
Tightening torque 10 Nm (7 lbf ft)
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