84 F2B ENGINE T RAKKER E URO 4/5 5412 ROCKER SHAFT Figure 143 44925 The camshaft cams directly control rockers: 6 for injectors and 12 for 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. Rockers slide directly on the cam profiles via rollers. The other end acts on a bar directly supported by the two valves stems. A pad is placed between the rocker adjusting screw and the bar. Two lubrication holes are obtained inside the rockers.
The rocker shaft practically covers the whole cylinder head; remove it to have access to all the underlying components. Shaft Figure 144 79171 MAIN DATA OF THE ROCKER ARM SHAFT Check that the surface of the shaft shows no scoring or signs of seizure; if it does, replace it. Rocker Figure 145 Figure 147 SECTION A-A SECTIONB -B SECTION A-A SECTION B -B 44914 44913 PUMP INJECTOR ROCKER DISCHARGE VALVE ROCKER Figure 146 Figure 148 SECTION A-A SECTION B -B 92822 EXHAUST VALVES ROCKER 44912 LEVER WITH ENGINE BRAKE CONTROL The bush surfaces must not show any trace of scoring of excessive wear; otherwise, replace bushes or the whole rocker. ECCENTRIC PIN Base q November 2006 Print 603.93.641