Rear cylinder head, to fit (in car)
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Rear cylinder head, to fit (in car)
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1.
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Ensure the crankshaft is at 60
°
BTDC.
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2.
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Clean all mating surfaces and position the gasket. Note the guides for the gasket and check that it is marked
OBEN/TOP
.
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4.
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Place the cylinder head in position. Use new bolts. Tighten in the order shown.
Tightening torque:
Step I: 25 Nm (18.5 lbf ft)
Step II: Tighten a further 90
°
Step III: Tighten a further 90
°
Step IV: Tighten a further 90
°
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5.
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Place the exhaust camshaft in position. Check that it is placed correctly. Lubricate generously with oil.
Cylinders 1-3-5 (rear)
The locating pins for the camshafts should point to the inside bolts for the camshaft bearing caps.
Observe the markings on the bearing caps and cylinder head. Coat the cylinder head contact surfaces of the front bearing caps sparingly with part No. (10) 74 96 268, see illustration.
Fit the stuffing box and bearing caps and tighten the bolts. Tighten them in steps of 1/2 to 1 turn.
Tightening torque: 8 Nm (6 lbf ft)
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6.
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Fit the inner (rear) timing cover.
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7.
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Fit the camshaft sprockets correctly in relation to the locating pins. Check the position against the markings in the timing cover.
Tightening torque: 50 Nm (37 lbf ft) +60
°
Warning
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The jaws of the open-ended spanner used as a counterstay when fitting the camshaft sprockets must not be too long. There is otherwise a risk of damaging the metal so that the tappets become locked.
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8.
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Check that the O-rings are in position in the camshaft cover and wipe clean. Lubricate with a soap solution and apply sealant, part No. (10) 81 52 381, in the corners of the camshaft bearing caps. Fit the camshaft cover.
Tightening torque: 8 Nm (6 lbf ft)
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9.
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Fit the ignition discharge module.
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10.
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Bolt the front exhaust pipe to the rear exhaust manifold.
Tightening torque: 40 Nm (29.5 lbf ft).
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11.
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Fit the coolant pump.
Tightening torque: 25 Nm (18.5 lbf ft).
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12.
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Fit the bracket with tensioning roller and the upper adjuster roller.
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13.
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Fit locking tool KM-800-1 on No. 1 and No. 2 camshaft sprockets and locking tool KM-800-2 on No. 3 and No. 4 camshaft sprockets.
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14.
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Rotate the crankshaft to just before the 0
°
mark and fit tool KM-800-10. Carefully rotate the crankshaft in the direction of rotation of the engine until the arm is lying against the coolant pump flange and remove the tool.
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15.
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Install the camshaft belt using the markings on the belt and the indicated rotation direction. Use
Adjustment tool for camshaft sprocket and camshaft belt
, KM-800-30, to hold the belt in place. Fit the lower tensioning pulley loosely. Make sure that the washer is in place. Adjust the tensioning pulley by hand so the belt does not disengage. Adjust anticlockwise. Check to see that the markings on the camshaft belt match the corresponding markings on the camshaft drive and the crankshaft. Disengage tool KM-800-30.
Fit locking tool KM-800-10, position a piece of camshaft belt and fit
Belt tension gauge
, part no. 83 93 985, to measure the belt tension.
Tighten the centre bolts of the adjuster rollers lightly. Adjust the lower adjuster roller anticlockwise until a tension of 275-300 Nm is obtained. Use tool 83 94 983. Tighten the adjuster roller's bolt. Use tool 83 94 983 as a counterstay. Check the belt tension again and adjust as necessary.
Tightening torque: 40 Nm (30 lbf ft)
Remove the belt-tension meter and piece of the toothed belt.
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Important
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Adjustment of belt tension is only a preparatory measure and must not be used as a check when the belt is finally adjusted.
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16.
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Ensure the adjusting nut on the upper adjusting roller rotates freely and is not tight. Adjust the tensioning pulley with a 5 mm Allen key until the two lines on the tensioning pulley correspond with each other. Tighten.
Tightening torque: 20 Nm (15 lbf ft)
Remove the locking tool for camshaft sprockets 1 and 2. Fit tool KM-800-20. Then, adjust the upper adjusting roller anticlockwise with tool 83 94 983 until the markings on the camshaft sprocket are aligned with the corresponding markings on KM-800-20. Tighten. Use tool 83 94 983 as a counterstay.
Tightening torque: 40 Nm (30 lbf ft)
Remove KM-800-20 and the other locking tools.
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17.
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Rotate the engine two revolutions in the direction of rotation until just before the zero mark and fit locking tool KM-800-10 on the crankshaft. Carefully rotate the crankshaft in the direction of rotation of the engine until the arm is lying against the coolant pump and tighten it. Fit tool KM-800-20 and ensure the markings on the camshaft sprocket are opposite the markings on the tool and that the edge of the belt is aligned with the edge of the sprocket.
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Important
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Check that marking A is about 2 mm above marking B. If this distance is smaller, adjustment must be carried out afresh.
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18.
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Fit the coolant bridge. Coat the bolts with (10) 74 96 284. Mind the gaskets.
Tightening torque: 30 Nm (22 lbf ft).
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19.
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Fit the lower intake manifold with new gaskets.
Tightening torque: 20 Nm (15 lbf ft)
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20.
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Fit the middle intake manifold.
Tightening torque: 20 Nm (15 lbf ft)
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21.
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Fit the upper intake manifold with a new gasket.
Tightening torque: 20 Nm (15 lbf ft)
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22.
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Connect the fuel lines.
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23.
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Plug in the connectors for the ignition discharge module and injectors.
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Important
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To reduce the risk of hoses mounted on the delivery side of the turbocharger coming loose due to low friction at high air pressure, the hoses and connecting pieces must be cleaned thoroughly before fitting. Use a rag dampened with 93 160 907 Motip Dupli cleaning agent to wipe clean inside the ends of the hoses. Clean the connecting pieces as well. If hose clips are rusty or damaged, they must be replaced so the correct clamping force is maintained.
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24.
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Connect the vacuum hose and the two water hoses to the throttle. Fit the turbo pressure hose with charge air bypass pipe. Plug in the throttle connector and connect the hose to the venting valve on the underside of the throttle.
Tightening torque:
Bypass pipe 8 Nm (6 lbf ft)
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25.
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Connect the vacuum hoses and plug in the pressure sensor's connector to the upper intake manifold.
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26.
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Refit the throttle cable.
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27.
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Fit the crankshaft pulley with the notch facing the projection on the engine (diagonally upwards-forwards).
Tightening torque: 20 Nm (15 lbf ft)
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28.
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Fit the timing cover.
Tightening torque: 8 Nm (6 lbf ft)
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29.
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Fit the belt tensioner and the generator air intake.
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30.
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Fit the coolant pump pulley and the power steering pump pulley. Use Loctite, part No. 74 96 292. Do not tighten the bolts.
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31.
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Fit the multigroove belt.
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32.
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Tighten the retaining bolts on the pulleys.
Tightening torque:
Belt pulley/coolant pump: 8 Nm (6 lbf ft)
Belt pulley/power steering pump: 20 Nm (15 lbf ft)
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33.
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Fit the right-hand engine attachment with bracket and engine mount.
Tightening torque:
To body 63 Nm (46.5 lbf ft)
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34.
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Fit the power steering hose in the holder
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35.
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Fit the mass air flow sensor with hose.
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37.
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Lower the engine by carefully removing the wedges.
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39.
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Reconnect the negative cable to the battery.
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40.
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Fill up with coolant. Do not forget to close the radiator drain cock first. Screw on the expansion tank filler cap.
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41.
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Bleed the cooling system as follows:
Fill the system up to the MAX level, close the expansion tank filler cap, start the engine and warm it up (by running it at varying rpm) until the radiator fan starts. Unscrew the expansion tank filler cap and top up again to the MAX level. Close the filler cap and run the engine at varying rpm until the radiator fan starts three more times. Switch off the engine and top up as necessary to the MAX level.
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Note
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The A/C should be OFF.
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44.
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Fit the lower spoiler sections.
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46.
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Fit the engine cover and remove the wing protectors.
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47.
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Reset the clock and the radio, if fitted.
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