114 F2B ENGINE T RAKKER E URO 4/5 Base q November 2006 Print 603.93.641 Variable geometry movement control Figure 225 C106226 Remove screws (2) and take actuator (1) off turbocompressor (7). Remove screw (6), underlying disk (5), ring (4) and disconnect tie rod (3) of actuator (1) from the pin of variable geometry driving lever (8). Accurately clean pin ( ) of lever (8) and bushing ( ) of tie rod (3) using a cloth made of non abrasive micro fibre. Checking the actuator Figure 226 106227 Check actuator efficiency (1) operating as follows. Apply, to fitting (2) of actuator (1), compressed air feed piping provided with pressure regulator (4).
By using the pressure regulator, introduce, into the actuator, compressed air slowly modulating it, from 0 3.5 bar;tie rod(3)ofactuator (1) must move without jamming; otherwise, replace actuator (1). Figure 227 106228 Check for anyactuator leaks at indicated points ( ) applying, on these points, a solution of suds. When actuator (1) is fed with compressed air, no bubbles must be found at indicated points ( ); otherwise, replace actuator (1). NOTE Do not use abrasive paper of any kind. Visually check the conditions of bushing ( ) of tie rod (3) and pin ( ) of lever (8); where they are found to be worn out, replace actuator (1) or turbocompressor (7).
Check variable geometry inner driving mechanism movement by operating on lever (8); jamming must not occur; otherwise, clean turbine body, as described in relating chapter.