• Remove camshafts with chain sprockets. • Remove the lower camshaft carrier. Checking centrifugal decompressor lever L Note: Never stretch the spring, since this alters the preset spring force. Checking camshaft for wear • When activated, the lever must not project be- yond the cam base circle by less than distance “ B ”. F110040 • Measure bearing play with Plastigage type PG-1, BMW No. 00 2 590 . • Tighten camshaft carrier to specified torque. B X Tightening torque: Camshaft carrier........................................... 10 Nm E110090 • Remove camshaft carrier and determine bearing clearance using comparative scale. Distance “ B ”................................
0.6 mm (0.024 in) 11 31 530 Disassembling and assembling the centrifugal decompressor Wear limits: Cam height I.......................min. 39.25 mm (1.55 in) Cam height E .....................min. 39.05 mm (1.54 in) Bearing journal diameter min. 21.950 mm (0.864 in) Bearing diameter in bearing block ..................max. 22.040 mm (0.87 in) Bearing play ....................max. 0.090 mm (0.004 in) 2 11 31 671 Removing and installing timing-chain sprockets • Clamp the camshaft in a vise fitted with protec- tive jaws. • Remove the fastener securing the sprocket to the camshaft and remove the camshaft sprocket.
• Installation is the reverse of the removal proce- dure, pay particular attention to the following. • Before installing, oil the thread of the chain- sprocket fastener. 3 E110100 1 L Note: If the centrifugal decompressor is dismantled, spring (3) must always be replaced. X Tightening torque: Sprocket to camshaft (thread oiled) ................................................ 60 Nm • Use a suitable punch to press shaft (1) out of centrifugal weight (2). • Installation is the reverse of the removal proce- dure, pay particular attention to the following. • After assembly, check ease of movement of cen- trifugal weight. 11.27 00 2 59 0 00 2 59 0