F2B ENGINE 97 T RAKKER E URO 4/5 PRINT603.93. 641/A Intake and exhaust rocker clearanceadjustmentand pre-loadingof rockers controlling pump injectors Figure 196 ADJUSTMENT OF Adjustment of clearances between rockers and valve studs and preloading of pump injector rockers should be carried out with extreme care. Take the cylinder where clearance must be adjusted to the bursting phase; its valves are closed while balancing the symmetric cylinder valves. Symmetric cylinders are 1-6, 2-5 and 3-4. In order to properly operate, follow these instructions and data specified on the table. Adjustment of clearance between the rockers and rods controlling intake and exhaust valves:
- Use a polygonal wrench to slacken the locking nut (1) of the rocker arm adjusting screw (2). - Insert the strip of feeler gauge (3) corresponding to the - Tighten or untighten the adjustment screw with the working clearance (page 13); appropriate wrench; - Make sure that the gauge blade (3) can slide with a slight friction; - Lock the nut (1), by blocking the adjustment screw. Pre-loading of rockers controlling pump injectors:
- Using a polygonal wrench, loosen the nut locking the rocker adjustment screw (5) controlling the pump injector (6); Print 603.93.641/A Base q November 2006 Revi - June 2007 44936A ST AND INJECTION ROCKERS - Using an appropriate wrench (4), loosen the adjustment screw until the pumping element is at the end-of-stroke; - Tighten the adjustment screw, with a dynamometric wrench, to 5 Nm tightening torque (0.5 kgm); - Untighten the adjustment screw by 1/2 to 3/4 rotation; - Lock nut at prescribed torque. FIRING ORDER 1-4-2-6-3-5 Clockwise start-up and rotation Balancing cylinder valve no. Adjusting clearance of cylinder valve no. Adjusting pre-loading of cylinder injector no. 1 and 6 at P.M.S.
6 1 5 120º 3 4 1 120º 5 2 4 120º 1 6 2 120º 4 3 6 120º 2 5 3 NOTE In order to carry out operations above correctly, perform sequence indicated in table, checking, at each rotation phase,that position correct using pin 99360612 to be inserted in hole identified by a notch on flywheel, corresponding to the position of pistons (see detail fig. 173).