Page 8 of JE Pro Seal Catalog by JE Pistons

9 Part # Bore Range Radial Part # Bore Range Radial Part # Bore Range Radial 3000-122 2.999-3.039 .122 3040-122 3.040-3.070 .122 3071-122 3.071-3.101 .122 3102-122 3.102-3.132 .122 3133-122 3.133-3.163 .122 3164-122 3.164-3.184 .122 3187-132 3.185-3.249 .132 3267-122 3.266-3.307 .122 3308-122 3.308-3.344 .122 3346-122 3.345-3.386 .122 3390-122 3.387-3.410 .122 3425-122 3.424-3.465 .122 3466-122 3.466-3.497 .122 3500-142 3.498-3.559 .142 3562-162 3.560-3.622 .162 3625-162 3.622-3.680 .162 3681-173 3.681-3.711 .173 3712-173 3.712-3.747 .173 3750-162 3.748-3.809 .162 3812-173 3.810-3.874 .173 3875-173 3.875-3.904 .173 3905-173 3.905-3.934 .173 3935-173 3.935-3.959 .173 3960-173 3.960-3.998 .173 4000-183 3.999-4.029 .183 4030-183 4.030-4.059 .183 4060-183 4.060-4.079 .183 4080-183 4.080-4.119 .183 4125-183 4.120-4.154 .183 4155-183 4.155-4.184 .183 4185-183 4.185-4.247 .183 4250-193 4.248-4.279 .193 4280-193 4.280-4.309 .193 4310-193 4.310-4.349 .193 4350-193 4.350-4.374 .193 4375-193 4.375-4.437 .193 4440-203 4.438-4.499 .203 4500-203 4.500-4.559 .203 4562-203 4.560-4.599 .203 4600-203 4.600-4.635 .203 4675-203 4.675-4.700 .203 4800-203 4.800-4.830 .203 Locate End Gap Here Top View Wrist Pin Rail Wrist Pin Side View Rotational Locking Detent Detent To convert Bore Range to metric, multiply bore size by 25.4 Part # Bore Range Radial Part # Bore Range Radial Part # Bore Range Radial 4000-142 3.999-4.029 .142 4030-142 4.030-4.059 .142 4060-142 4.060-4.079 .142 4080-142 4.080-4.119 .142 4125-142 4.120-4.154 .142 4155-142 4.155-4.184 .142 4185-142 4.185-4.247 .142 4250-142 4.248-4.279 .142 4280-142 4.280-4.309 .142 4310-142 4.310-4.349 .142 4350-142 4.350-4.374 .142 4375-142 4.375-4.437 .142 4440-142 4.438-4.499 .142 4500-142 4.500-4.559 .142 4562-142 4.560-4.599 .142 4600-142 4.600-4.635 .142 4675-142 4.675-4.700 .142 4800-142 4.800-4.830 .142 To convert Bore Range to metric, multiply bore size by 25.4 Oil support rails are used when the wrist pin bore of the piston intersects or is machined into the piston oil ring groove. This occurs when a longer rod or stroke creates the necessity for a short compression height piston. The rail supports, when installed, rest on the bottom of the piston oil ring groove. These rails are specifically designed with radial widths that prevent contact with the cylinder wall. Their sole function is to support the oil ring and to prevent oil from escaping through the gap in the lower oil ring land created by the pin bore. This function can be compromised when the oil rail support rotates in the ring groove and allows the rail support gap to align itself with the wrist pin bore opening. In order to prevent this condition, all JE Pro Seal oil rail supports are manufactured with a locking detent that holds the rail support gap 90 from the wrist pin opening (see illustration below). All JE Pro Seal oil rail supports are sold pre-gapped to the bore size listed in the charts below. OIL RING RAIL SUPPORTS REDUCED RADIAL OIL RAIL SUPPORTS FOR METRIC OIL RINGS WITH REDUCED RADIALS OIL RAIL SUPPORTS

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