4. DISASSEMBLY, INSPECTION AND REASSEMBLY OF ENGINES (b) Piston pin hole measurement Measure the outside diameter of piston pin and the inside diameter of piston pin hole. Calculate the clearance between piston pin and piston pin hole. If any data exceeds the limit, replace the part with a new one. mm (c) Piston ring, ring groove and end clearance measurement Except for the top ring, to measure the piston ring groove width, first measure the width of the piston ring. Then insert the piston ring into the ring. Then insert the piston ring into the ring groove. In- sert a thickness gauge in between the piston ring and groove to measure the gap between them.
Obtain the ring groove width by adding ring width to the measured side clearance. To measure the end clearance, push the piston ring into the sleeve using the pis- ton head, insert a thickness gauge in end clearance to measure. The ring shall be pushed in to approx. 30 mm above the bottom end of the cylinder. For the top ring, measure only the piston ring joint end clearance in normal state. 82E-5 – 98E-5 SERIES 4-45 Model Item Standard Limit 3D82AE Pin I.D. 23.000 – 23.009 23.039 Pin O.D. 22.995 – 23.000 22.965 Clearance 0.000 – 0.014 0.074 (S)3D84E (S)4D84E 3D88E 4D88E Pin I.D. 26.000 – 26.009 26.039 Pin O.D. 25.995 – 26.000 25.965 Clearance 0.000 – 0.014 0.074 4D94LE (S)4D98E Pin I.D.
30.000 – 30.009 30.039 Pin O.D. 29.989 – 30.000 29.959 Clearance 0.000 – 0.020 0.080