SEGMENT-SPROCKET 6Y5012 - Caterpillar

TYPICAL ILLUSTRATION(1) Turn nut until contact is made with washer, then turn an additional ... 21/4 Turns(2) Torque for nuts that hold bracket for rocker arm shaft ... 30 5 lb. ft.(40 7 N m)(3) Clearance for valves: Exhaust valves ... .028 in.(0.71 mm)Intake valves ... .016 in.(0.41 mm)(4) Torque for locknut on valve adjustment screw ... 40 5 lb. ft.(55 7 N m)(5) Diameter of shaft ... 1.223 to 1.224 in.(31.06 to 31.09 mm) Bore in bearing for shaft ... 1.2260 .0005 in.(31.140 0.013 mm)Maximum permissible clearance between bearing and shaft ... .010 in.(0.25 mm)(6) Torque for bolts that hold guide for valve lifter (follower) ... 32 5 lb. ft.(43 7 N m)(7) Diameter of guide for valve lifter (follower) ... 1.6875 .001 in.(42.862 0.03 mm) Bore in block for guide for valve lifter (follower) ... 1.691 .002 in.(42.95 0.05 mm)(8) Diameter of valve lifter (follower) ... .9965 .0005 in.(25.311 0.013 mm) Bore in guide for valve lifter (follower) ... .9995 .0005 in.(25.387 0.013 mm)Maximum permissible clearance between lifter (follower) and bore in guide ... .008 in.(0.20 mm)