198 F3B ENGINE T RAKKER E URO 4/5 PRINT603.93. 641 Base q November 2006 Print 603.93.641 540831 Checking crankpin assembly clearance To measure the clearance, carry out the following operations. Connect the connecting rods to the relevant journals of the crankshaft, placing a length of calibrated wire on the journals. Figure 128 47594 Mount the connecting rod caps (1) together with the bearing shells. Tighten the screws (2) fixing the connecting rod caps to a torque of 60 Nm (6 kgm). Using tool 99395216 (3), further tighten the screws with an angle of 60 . NOTE The thread of the screws (2), before assembly, has to be lubricated with engine oil.
Remove the caps and determine the clearance by comparing the width of the calibrated wire with the graduated scale on the case containing the calibrated wire. Upon final assembly: check the diameter of the thread of the screws (2), it must be no less than 13.4 mm; if it is, change the screw. Lubricate the crankpins and connecting rod bearings. Tighten the screws (2) as described above. 540610 CYLINDER HEAD Before dismounting cylinder head, check cylinder head for hydraulic seal by proper tooling; in case of leaks not caused by cup plugs or threaded plugs, replace cylinder head.
When replacing, the cylinder head is supplied as a spare part with a threaded plug, which must be removed during assembly. NOTE In case of plugs dismounting/replacement, on mounting, apply sealant Loctite 270 on plugs. Disassembly the valves NOTE Before dismounting cylinder head valves, number them in view of their remounting in t he position observed on dismounting should they not have to be overhauled or replaced. Intake valves are different form exhaust valves in that they have a notch placed at valve head centre. Figure 129 47583 Mount and secure the tool 99360263 (2) with the bracket (4). Screw down with the device 99360261 (1) to be able to remove the cotters (3).
Take out the tool (2) and extract the top plate (5), spring (6) and bottom plate (7). Repeat this process on all the valves. Turn over the cylinder head and take out the valves (8). Checking head bearing surface on cylinder block Figure 130 (Demonstration) 36159 Check the supporting surface (1) of the head on the cylinder block with a rule (2) and a feeler gauge (3). If you find any deformation, level the head on a surface grinder; maximum amount of material that can be removed 0.2 mm. NOTE After this process, you need to check the valve recessing and injector protrusion.