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ENGINE UNIT EM-239 < UNIT DISASSEMBLY AND ASSEMBLY > [VK56DE] C D E F G H I J K L M A EM N P O (Piston pin clearance) = (Piston pin hole diameter) – (Piston pin diameter) • If clearance exceeds specification, replace either or both the pis- ton/piston pin assembly and the connecting rod assembly with ref- erence to the specification of each part. • Use the piston selection table to replace piston/piston pin assem- bly. Refer to EM-248, "How to Select Piston and Bearing" • Use the connecting rod bearing selection table to replace connect- ing rod. Refer to EM-248, "How to Select Piston and Bearing" NOTE: The connecting rod small end grade and piston pin hole (piston pin) grade are provided only for the parts installed at the plant. For service parts, no grades can be selected (only 0 grade is avail- able). • Follow the connecting rod bushing oil clearance (small end) proce- dure for the values for each grade at the plant. PISTON RING SIDE CLEARANCE • Measure side clearance of the piston ring and piston ring groove using suitable tool. • If out of specification, replace piston and/or piston ring assembly. PISTON RING END GAP • Check if the diameter of the cylinder bore is within specification. Follow the "Piston to Cylinder Bore Clearance" procedure. • Insert the piston ring into the middle of the cylinder using the pis- ton, and measure the gap. • If out of specification, replace piston ring. Standard : 0.002 - 0.006 mm (0.0001 - 0.0002 in) KBIA2496E KBIA2536E Standard: Top ring : 0.035 - 0.085 mm (0.0014 - 0.0033 in) 2nd ring : 0.030 - 0.070 mm (0.0012 - 0.0028 in) Oil ring : 0.015 - 0.185 mm (0.0006 - 0.0073 in) Limit: Top ring : 0.11 mm (0.0043 in) 2nd ring : 0.10 mm (0.0039 in) SEM024AA Standard Top ring : 0.23 - 0.33 mm (0.0091 - 0.0130 in) 2nd ring : 0.25 - 0.40 mm (0.0098 - 0.0157 in) Oil ring : 0.20 - 0.60 mm (0.0079 - 0.0236 in) Limit: Top ring : 0.56 mm (0.0220 in) 2nd ring : 0.52 mm (0.0205 in) Oil ring : 0.96 mm (0.0378 in) PBIC0118E 2011 Pathfinder |