Fitting pistons (in situ)
Fitting pistons (in situ) |
Important | ||
Pistons of different makes must not be used in the same engine. The name of the manufacturer is cast inside the piston. |
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1. |
Assemble piston and connecting rod by driving in the gudgeon pin, using a plastic mallet and drift. Make sure that the mark on the piston crown faces the timing cover and that the numbers on the connecting rods face the exhaust side.
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2. |
Fit the gudgeon pin lock ring.
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3. |
Place the bearing shells in place in the connecting rods.
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4. |
Fit protective sleeves, part no. 75 19 531, on the connecting rod studs and oil the piston rings, bearings and cylinder.
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5. |
Fit the piston using the fitting tool, part no. 78 62 287.
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6. |
Fit the big-end bearing caps with bearing shells (connecting rod numbers facing in the same direction).
Tightening torques: 20 Nm + 70° (14.8 lbf ft + 70°) |
7. |
Check that there are no impurities or other foreign matter in the sump and clean the sealing surfaces with benzine.
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8. |
Apply an even bead of Loctite 518 on the sealing surface of the oil sump and fit the oil sump.
Tightening torque: 22 Nm (16.2 lbf ft). |
9. |
Fit the protective plate.
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10. |
Lift up the subframe and bolt it in place.
Tightening torques: Front: 115 Nm (85 lbf ft) Centre: 190 Nm (140.6 lbf ft) Rear: 110 Nm + 75° (81.4 lbf ft + 75°) |
11. |
Fit and tighten the end piece nuts.
Tightening torque: 75 Nm (55.5 lbf ft) |
12. |
Clean the area for the joint in the exhaust pipe.
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13. |
Fit the front exhaust pipe. Lubricate the stud screws on the turbocharger with Molycote 1000 before fitting.
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14. |
Screw together the joint between the front and intermediate exhaust pipes.
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15. |
Fit the air shields and wheels.
Tightening torques: Wheels: 120 Nm (89 lbf ft) |
16. |
Make sure the oil drain plug is tight, lower the car and fill with engine oil. Replace the dipstick, connect the oxygen sensor cable and remove the lifting beam
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