No. Designation Qty. Removal Installation · 13 a-ring 2

911 Carrera (996) Engine -Cylinder head, valve drive Note: No. Designation Qty. Removal Installation 13 a-ring 2 Replace;grease lightly 14 Guiderail 1 Inspectfor scoring and Observe installation replace if necessary position; slot faces the crankshaft 15 Fasteningscrew 1 Tighteningtorque 10 Nm for tensioningrail (7.5 ftlb.) 16 a-ring 1 Replace;grease lightly 17 Tensioningrail 1 Inspectfor scoring and replace if necessary 18 Chaintensioner on 1 Tigtening torque: 80 Nm cylinder bank 4 -6 (59 ftlb.) Wrench size 32 mm 19 Sealingring A27 x 32 1 Alwaysreplace 20 a-ring 1 Replace 21 Hexagon-headbolt 4 Tightening torque 14 Nm M6 x 15 (10.9) (10.5 ftfb.) 22 Drive plate Driving plate for oil extraction pump 23 Sprocket wheel 1 The deeper recess on the sprocket wheel must face the camshaft 24 Pan-headscrew 3 Tighteningtorque 10 Nm M6 x 95 (7.5 ftlb.) 25 Tensioning element 1 Relievetensioning element Observe identification; with special tool, tensioning remove tensioning screw screw 9632, before 9632 only after the removal of the camshafts. camshafts or fastening Check guide rails for elementhas been scoring and replace fastened on the if necessary cylinder head 26 Inlet camshaft of cylinder 1 Identification bank 4 -6 216.55/3.4 IN 46 15 05 19 Removing and installing camshafts 15 -25 Printed in Germany -10, 1998 9961523