Manuale Officina LGW 523-627 - lombardini service

Disassembly / Reassembly4Cylinder head assemblyUse a torque wrench equipped with a device for angular tightening.Measure the length of each screw (normal length = 89.5÷90.5 mm).Replace it if it exceeds 92 mm.Proceed as follows.113Cylinder head tightening procedure LDW 502-602-702-903-1003ImportantOnce the head has been correctly tightened, it should not beretightened except if it is disassembled again.Before mounting it is advisable to lubricate stem, shank andunderhead of screws with SPARTAN SAE 460 oil.A = For LDW 502-602-702 modelsB = For LDW 903-1003 modelsFollowing the numerical order shown in the diagram, the bolts mustbe tightened in three phases:1141 st phase = 50 Nm2 nd phase = Rotate the wrench 90° in a clockwise direction.3 rd phase = Rotate the wrench again 90° in a clockwise direction.For LDW 502 with pressure cast (aluminium) crankcase:With head H tightening bolts:1 st phase = 60 NmWith head 8.8 tightening bolts: 1 st phase = 40 Nm2 nd phase = Eseguire una rotazionedella chiave in sensoorario di 90°.3 rd phase = Proseguire con unarotazione della chiave insenso orario di 90°.Cylinder head tightening procedure LDW 1204-1204/T-1404Following the numerical order shown in the diagram, the bolts mustbe tightened in three phases:1 st phase = 50 Nm2 nd phase = Rotate the wrench 90° in a clockwise direction.3 rd phase = Rotate the wrench again 90° in a clockwise direction.115FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06- 57 -