Manuale Officina LGW 523-627 - lombardini service

4Disassembly / ReassemblyShoulder half rings, oversized elementsDimensions (mm):C B **A*Std22,787÷22,92023,050÷23,1001 a 22,987÷23,12023,250÷23,3002 a 3,087÷23,22023,350÷23,4000,130÷0,3133 a 23,187÷23,32023,450÷23,500136137* A of Fig. 134.** B of Fig. 135.Grinding B as per relevant table, you can mount the following halfrings:1 st Oversized element Half rings 1 and 2 + 0.10 mm on both sidesof the bearing2 nd Oversized element Half rings 1 and 2 + 0.10 mm on one sideof the support and + 0.20 mm on the otherside.3 rd Oversized element Half rings 1 and 2 + 0.20 mm on both sidesof the bearing.Crankshaft front and back oil seal rings138Caution – WarningAn ambient temperature below -35°C may damage the rings.The front oil seal ring 1 inserted into the oil pump cover and the backone 2, in the flywheel side flange.If warped, hardened, or cracked, replace them.For the replacement:- Carefully clean the housing- Keep the ring immersed in engine oil for about half an hour.- Drive it into its housing with a buffer exercising a uniform pressureon the whole front surface. Be sure that the two surfaces A and Bmeet on the same level.- Refill the interior hollow with grease and lubricate the seal lip withthickened oil.Note: Before major engine overhaul, in case of oil leakage in theseal area of rings 3 and 4, you can remedy this by replacingthe rings and pushing them about 2 mm deeper with respectto the previous ones.If the rings are black it means zones 3 and 4 of the crankshaftare tempered. In this case it is necessary to remount a ring ofthe same colour.If the rings are brown it means that zones 3 and 4 of thecrankshaft are not tempered. In this case it is necessary toremount brown coloured rings.- 62 - FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06