Manuale Officina LGW 523-627 - lombardini service

Disassembly / Reassembly4Piston, disassembly and inspectionRemove the stop rings and remove the pin, see fig. 101.Remove the piston rings and clean the slot.Measure diameter Q at height A from the base of skirt (A = 9 mm).If the diameter is worn more than the 0.05 mm minimum givenvalue, replace piston and rings.Note: The provided oversize elements are of 0.50 mm and 1.00 mm103Piston, classThe pistons are subdivided according to their diameters into categories: A, B, C. These references, are shown on the top ofthe piston (see fig. 100).LDW502-602-903-1204-1204/TClass Ø Cylinder - mm Ø Piston - mm Clearance - mmA 71,990÷72,00071,930÷71,940B 72,000÷72,01071,940÷71,9500,050÷0,070C 72,010÷72,02071,950÷71,960LDW702 - 1003 - 1404Class Ø Cylinder - mm Ø Piston - mm Clearance - mmA 74,990÷75,00074,930÷74,940B 75,000÷75,01074,940÷74,9500,050÷0,070C 75,010÷75,02074,950÷74,960Piston supply:Pistons at the nominal diameter are only supplied in category A.Pistons oversized by 0.50 and 1.00 mm are supplied with reference to the increased level on the piston crown:Ø 72.5 - Ø 73 for LDW 502-602-906-1204-1204/T engines and Ø 75.5 – 76.0 for LDW 702-1003-1404 engines.FOCS Workshop Manual_cod. 1.5302.351_7° ed_ rev. 06- 53 -