GENERATOR GP 3442713 - Caterpillar

*Install piston ring with "UP" side toward top of piston. * 9L6932 Top Ring (1) has the mark "UP-1". 9L6933 Intermediate ring (2) has the mark "UP-2".**Install 9L6934 Oil Control Ring (3) with the gap in the spring 180° away from the gap in the ring. ***"Keystone" style piston rings and grooves in pistons. The 5P4812 KEYSTONE PISTON RING GROOVE GAUGE is necessary for measuring these grooves. Put the pin end (A) of gauge "2" in the groove at four places around the circumference. Do this to both grooves. The flat edge (B) of the gauge must be between grooves (1) and (2). If there is clearance between the flat edge (B) of the gauge and the piston at all test locations, for both grooves, the piston is reusable. If the flat edge (B) is in contact with the piston, at any of the test locations, the piston is not reusable. Install a new piston.
(4) Bore in piston for pin:9N5404 Piston ... 1.7006 .0003 in.(43.195 0.008 mm)8N2533 Piston ... 1.7006 .0003 in.(43.195 0.008 mm)Clearance between pin and bore in piston ... .0003 to .0013 in.(0.008 to 0.033 mm)Maximum permissible clearance (worn) ... .002 in.(0.05 mm) When installed in the engine, the "V" mark on top of the piston must be in alignment with the "V" mark on the cylinder block.