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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Important
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Be sure to select the correct gasket (Thinner for LEV engines)
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4.
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Place the cylinder head in position. Use new bolts. Tighten in the order shown.
Tightening torques:
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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Connect the hose to the SAI pipe and check the connection.
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11.
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Fit the SAI pipe with new gaskets to the exhaust manifold and cylinder head.
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12.
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Fasten the oxygen sensor connectors to the holder.
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13.
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Raise the car and fit the front exhaust pipe to the rear exhaust manifold.
Tightening torque: 40 Nm (29.5 lbf ft).
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14.
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Lower the car and fit the coolant pump.
Tightening torque: 25 Nm (18.5 lbf ft).
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15.
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Fit the bracket with tensioning roller and the upper adjuster roller.
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16.
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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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17.
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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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18.
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Refitting a marked timing belt:
Fit the timing belt in accordance with the marking on the belt and the marked direction of rotation. Use
83 95 006 Adjustment tools, cam sprocket and timing belt, V6
KM-800-30 in order to hold the belt in place. Fit the guide roller. Make sure that the washer is fitted correctly. Carefully check that the markings on the timing belt are aligned with the corresponding markings on the camshaft sprocket. Raise the car and check the marking on the crankshaft. Lower the car and remove the tool KM-800-30.
Fitting an unmarked timing belt:
Fit the timing belt in accordance with the belt's direction of rotation. Use
83 95 006 Adjustment tools, cam sprocket and timing belt, V6
KM-800-30 in order to hold the belt in place. Fit the guide roller. Make sure that the washer is fitted correctly. Carefully check that the markings are aligned with the camshaft sprockets. Remove the tool KM-800-30.
Fit the locking tool KM-800-10.
Tightening torque, guide roller, 40 Nm (30 lbf ft)
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19.
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Ensure the adjusting nut on the upper adjusting roller rotates freely and is not tight. Adjust the tension pulley with a 5 mm Allen key until the two lines on the tension 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 sprockets 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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20.
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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 sprockets are opposite the markings on the tool and that the edge of the belt is aligned with the edge of the sprockets.
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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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21.
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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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22.
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Fit the lower intake manifold with new gaskets.
Tightening torque: 20 Nm (15 lbf ft)
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23.
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Fit the middle intake manifold.
Tightening torque: 20 Nm (15 lbf ft)
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24.
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Fit the upper intake manifold with a new gasket.
Tightening torque: 20 Nm (15 lbf ft)
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25.
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Connect the fuel lines.
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26.
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Plug in the connectors for the ignition discharge module and injectors.
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27.
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Connect the turbo delivery pipe to the throttle body.
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28.
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Fit the vacuum hose and the two water hoses to the throttle body as well as the throttle body's connector. Fit the hose to the venting valve on the underside of the throttle body.
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29.
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Refit the throttle cable.
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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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30.
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Connect the vacuum hoses.
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31.
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Pressure/temperature sensor connector for the upper intake manifold.
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32.
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Fit the turbo bypass pipe with valve.
Tightening torque: 8 Nm (6 lbf ft)
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33.
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Plug in the connector for the pressure/temp sensor.
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34.
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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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35.
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Fit the timing cover.
Tightening torque: 8 Nm (6 lbf ft)
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36.
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Fit the belt tensioner and the generator air intake.
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37.
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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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38.
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Fit the multigroove belt.
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39.
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Tighten the retaining bolts on the pulleys.
Tightening torques:
Belt pulley/coolant pump: 8 Nm (6 lbf ft)
Belt pulley/power steering pump: 20 Nm (15 lbf ft)
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40.
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Fit the right-hand engine attachment with bracket and engine mount.
Tightening torques:
To body 63 Nm (46.5 lbf ft)
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41.
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Fit the power steering hose in the holder
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42.
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Fit the mass air flow sensor with hose.
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44.
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Lower the engine by carefully removing the wedges.
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45.
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Lower the car to the floor.
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46.
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Reconnect the negative cable to the battery.
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47.
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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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48.
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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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51.
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Fit the lower engine covers.
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52.
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Lower the car to the floor.
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53.
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Fit the engine cover and remove the wing protectors.
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54.
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Reset the clock and, where appropriate, the radio code.
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