159219-1420 ZEXEL 9 421 615 631 BOSCH SPRING PACK 9421615631 1592191420 8970850090

(1) Body assembly. Install piston with "FRONT" toward front of engine. Assemble so the markings "FRONT" on the piston body assembly and the forging part number on the connecting rod assembly point in opposite directions. Install connecting rod and piston group with rod forging part number to the rear of the engine. The rear of the engine is the flywheel end. Thoroughly lubricate the piston group with clean engine oil just before inserting into block group.(2) Connecting rod.Top And Intermediate Ring
Install piston ring with "UP" side toward top of piston.(3) Top Ring has the mark "UP-1". Clearance between ends of piston ring when installed in a cylinder with a bore size of 105.025 mm (4.1348 in) ... 0.525 0.125 mm (.021 .005 in)Increase in clearance between ends of piston ring for each 0.03 mm (.001 in) increase in cylinder bore size ... 0.09 mm (.004 in)(4) Intermediate Ring has the