SEGMENT-SPROCKET 3086854 - Caterpillar

Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     8H-8581     Feeler Gauge     1    
B     8T-5096     Dial Indicator Group     1    
Illustration 1 g00996359
(1) Diameter of the piston pin Nominal value ... 30 mm (1.18 inch) Standard at assembly ... 29.994 to 30.000 mm (1.1809 to 1.1811 inch)Clearance between the piston pin and the bore Standard at assembly ... 0.000 to 0.016 mm (0.0000 to 0.0006 inch) Service limit ... 0.050 mm (0.0020 inch)Refer to table 2 for the outside diameters of the pistons.
Table 2
Item     Standard at Assembly     Service Limit    
Standard    
93.955 to 93.985 mm (3.6990 to 3.7002 inch)    
93.770 mm (3.6917 inch)    
0.25 mm (0.0098 inch) oversize    
94.205 to 94.235 mm (3.7089 to 3.7100 inch)    
94.020 mm (3.7016 inch)    
0.50 mm (0.0197 inch) oversize    
94.455 to 94.485 mm (3.7187 to 3.7199 inch)    
94.270 mm (3.7114 inch)    Maximum difference in weight of the piston per engine ... 0.005 kg (0.0110 lb)
Illustration 2 g01256915
Use Tooling (A) in order to measure the piston ring end gap. Standard at assembly ... 0.30 to 0.50 mm (0.0118 to 0.0197 inch) Service limit ... 1.50 mm (0.0591 inch)
Illustration 3 g01256914
Use Tooling (A) in order to measure the clearance between the piston groove and a new piston ring.No. 1 ring Standard at assembly ... 0.07 to 0.11 mm (0.0028 to 0.0043 inch) Repair limit ... 0.200 mm (0.0079 inch)No. 2 ring Standard at assembly ... 0.045 to 0.085 mm (0.0018 to 0.0033 inch) Repair limit ... 0.150 mm (0.0059 inch)Oil ring Standard at assembly ... 0.025 to 0.065 mm (0.0010 to 0.0026 inch) Repair limit ... 0.150 mm (0.0059 inch)
Illustration 4 g01256913
Use Tooling (B) in order to measure the protrusion of the piston (2) .Standard at Assembly Naturally aspirated engines ... −0.25 to 0.15 mm (−0.0098 to 0.0059 inch) Turbocharged engines ... 0.05 to 0.45 mm (0.0020 to 0.0177 inch)Compressed thickness of cylinder head gasket ... 1.2 0.05 mm (0.05 0.002 inch)
Illustration 5 g00987977
(3) Piston from naturally aspirated engines (4) Piston from turbocharged engines (5) "WEIGHT" mark (6) "MATCHING" markNote: Assemble the piston and the connecting rod with the "WEIGHT" mark on the piston and with the "MATCHING" mark on the rod on the same side.
Illustration 6 g00987981
(7) Camshaft side (8) End gap of No. 1 compression ring (9) End gap of No. 2 compression ring (10) Side with the inlet valve (11) End gap of oil ringApply engine oil to the piston rings. Refer to Illustration 6 for the assembled configuration of the ends of the piston rings.Note: Install the piston with the "O" mark toward the front of the engine.