F2B ENGINE 83 T RAKKER E URO 4/5 - - - Print 603.93.641 Base q November 2006 Figure 138 Rear 71724 insert bushing (7), proceed as follows: Unscrew the grip (I) and the extension (N). Refit theguide (G) from the inside as shown in thefigure. Position the bushing on the drift (A) and bring it close up to the seat, making the bushing hole match the lubrication hole in the head. Drive it home. The 7th bushing is driven in when thereference mark (C) is flush with the bushing seat. 0665 VALVE SPRINGS Figure 139 (Demonstration) 70000 fore assembly, the flexibility of the valve springs has to be ecked using a suitable tool.
mpare the load and elastic deformation data with those the new springs given in the follo wing figure. Figure 140 Valve closed Valve open 109107 MAIN DATA TO CONTROL EXHAUST AND DISCHARGE VALVE SPRING Fitting the valves and oil seal ring Figure 141 87051 Lubricate the valve stem and insert the valves in the respective valve guides; fit the lower caps (1). Use tool 99360329 to fit the oil seal (2) on the valve guides (3) of the exhaust valves; then, to fit the valves, proceed as follows. NOTE Should valves not have been overhau led or replaced, remount them according to numbering performed on dismounting.
Intake valves are different form exhaust valves in that they have a notch placed at valve head centre. Figure 142 86290 - fit springs (6) and the upper plate (5); - apply tool 99360264 (2) and block it with bracket (4); tighten the lever (1) until cotters are installed (3), remove tool (2).