208 F3B ENGINE T RAKKER E URO 4/5 Fitting valves and oil seal Figure 160 Figure 159 86290 - Mount the springs (6) and the top plate (5). - Fit the tool 99360263 (2) and secure it with the bracket (4). Screw down the lever (1) to be able to fit on the cotters (3). Take off the tool (2). 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. 5412 ROCKER SHAFT Figure 161 44925 The cams of the camshaft control the rocker arms directly: 6 for the injectors and 12 for the valves. Injectors and intake valves control rocker arms are keyed on rocker arms shaft directly. Exhaust intake valves control rocker arms are keyed on rocker arms shaft putting in between the levers with engine brake control eccentric pin. The rocker arms run directly on the profiles of the cams by means of rollers. The other end acts on a crosspiece that rests on the stem of the two valves.
There is a pad between the rocker arm adjustment screw and the crosspiece. There are two lubrication ducts inside the rocker arms. The length of the rocker arm shaft is basically the same as that of the cylinder head. It has to be detached to be able to reach all the parts beneath. Base q November 2006 Print 603.93.641