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6 SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS F3A Type F3A Type mm 1 X NUERAL MAHLE - PISTON X 1 2 X X1* * 3.225 2.955 to 2.985 X2 Piston ring grooves X2 3.05 to 3.07 3 X X3 * measured on ∅ of 120 mm 4.02 to 4.04 Piston rings: S1* 2.796 to 2.830 1 S p lune seal S2 ill d i 2.796 to 2.830 2.970 to 3.000 3 2 S S milled scraper ring S3 3 970 to 3 990 spring S3 * measured on ∅ of 120 mm 3.970 to 3.990 1 0.3950 to 0.429 0.125 to 0.189 Piston rings - grooves 2 0.050 to 0.100 3 0.030 to 0.070 Piston rings - X1 2 X Piston ring end gap 3 2 X X X1 0.35 to 0.50 3 X X2 0.60 to 0.75 X3 0.35 to 0.65 1 ∅ Small end bush housing Ø1 54.000 to 54.030 ∅ 2 Big end bearing Ø2 1 Selection classes 2 { 87.000 to 87.030 87.000 to 87.010 ∅4 Small end bush diameter ∅ outside ∅4 54.085 to 54.110 ∅3 inside ∅3 50.019 to 50.035 S Big end bearing shell S Red 1.970 to 1.980 Small end bush - housing 0.055 to 0.110 Piston pin - bush 0.019 to 0.041 Big end bearing 0.127 - 0.254 - 0.508 Connecting rod weight g A 4024 to 4054 Class B 4055 to 4085 C 4086 to 4116 D Fitted in production only and not supplied as spares |