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EM-110 [YD] CYLINDER BLOCK Piston Outer Diameter Use micrometer to measure piston skirt outer diameter. Calculation of Piston Bore Clearance ● Calculate using piston skirt outer diameter and cylinder inner diameter (direction X, position B). − (Piston skirt outer diameter) ● If out of specification, replace piston and piston pin assembly. Refer to . Reboring Cylinder 1. Determine cylinder bore size by adding piston-to-cylinder bore clearance to piston diameter. 2. Install main bearing caps and tighten bolts to specified torque. This will prevent distortion of cylinder 3. Cut cylinder bore. ● When any cylinder needs boring, all other cylinders must also be bored. ● Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so at a time. 4. Hone cylinders to obtain specified piston-to-bore clearance. 5. Measure finished cylinder bore for out- of-round and taper. ● Measurement should be done after cylinder bore cools down. CRANKSHAFT JOURNAL OUTER DIAMETER Use micrometer to measure journal outer diameter. CRANKSHAFT PIN OUTER DIAMETER Use micrometer to measure pin outer diameter. Piston skirt diameter: Measurement position : 11.0 mm (0.43 in) Distance from the bottom Standard : 85.928 - 85.962 mm (3.3830 - 3.3843 in) 0.25 (0.0098) O/S : 86.188 - 86.202 (3.3932 - 3.3938) 0.50 (0.0197) O/S : 86.438 - 86.452 (3.4031 - 3.4036) PBIC0125E Specifications at room temperature [20 ° C (68 ° F)]: 0.058 - 0.082 mm (0.0023 - 0.0032 in) Rebore size calculation: D = A + B – C Where, D:Rebored diameter A: Piston diameter as measured B: Piston-to-bore clearance C: Honing allowance 0.02 mm (0.0008 in) Standard : 62.951 - 62.975 mm (2.4784 - 2.4793 in) FEM114 |