TURBO G-BASIC 1W6863 - Caterpillar

GUIDELINE FOR REUSUABLE PARTS; VALVES AND VALVE SPRINGS, Form SEBF8002, has the procedure necessary for checking used valves and valve springs.Valve clearance with engine stopped: Intake valve ... .012 in.(0.30 mm)(To make adjustment, turn adjusting screw 6 clicks counterclockwise from zero).Exhaust valve ... .026 in.(0.66 mm)(To make adjustment, turn adjusting screw 13 clicks counterclockwise from zero).(1) 3S3018 Spring for valve: Length under test force ... 1.738 in.(44.15 mm)Test force ... 45 5 lb.(200 22 N)Use again minimum load at length under test force ... 34.2 lb.(152.5 N)Length of spring at valve open position ... 1.258 in.(31.95 mm)Use again minimum load at valve open position ... 128.2 lb.(570.5 N)Free length after test ... 1.96 in.(49.8 mm)Outside diameter ... 1.215 in.(30.86 mm)Spring must not be bent more than ... .068 in.(1.73 mm)(2) Diameter of valve stem (new): 7S9345 and 2M6402 Valves ... .3720 .0005 in.(9.449 0.013 mm)1P1081 and 1P407 Valves ... .3717 .0003 in.(9.441 0.008 mm)Minimum permissible diameter of valve stem (worn):7S9345 and 2M6402 Valves ... .3695 in.(9.39 mm)1P1081 and 1P407 Valves ... .3694 in.(9.38 mm)6N3531 and 6N3532 Valves (tapered stem):Head end of valve stem ... .3717 .0003 in.(9.441 .008 mm)Use again minimum diameter of the head end of valve stem ... .3694 in.(9.383 mm)Lock end of valve stem ... .3725 .0003 in.(9.462 .008 mm)Use again minimum diameter of the lock end of valve stem ... .3702 in.(9.403 mm)(3) Valve lip thickness Intake Valves: Use again minimum ... .080 in.(2.03 mm)Exhaust valves:Use again minimum ... .080 in.(2.03 mm)(4) Angle of valve face (intake and exhaust) ... 441/4°(5) Diameter of valve head: Exhaust valve ... 1.646 .005 in.(41.81 0.13 mm)Intake valve ... 1.771 .005 in.(44.98 0.13 mm)
VALVE GUIDE WITH SHOULDER
VALVE GUIDE WITH NO SHOULDER(6) Bore in valve guide with guide installed in the head: Smooth bore valve guide ... .3744 to .3758 in.(9.510 to 9.545 mm)Maximum permissible bore (worn) ... .3785 in.(9.614 mm)
VALVE GUIDE WITH SHOULDERGrooved bore valve guide with shoulder ... .3727 .0005 in.(9.467 0.013 mm)Maximum permissible bore (worn) ... .3785 in.(9.614 mm)Grooved bore valve guide without shoulder:Minimum permissible bore ... .3727 in.(9.467 mm)Maximum permissible bore (worn) ... .3764 in.(9.561 mm)Grooved bore valve guide with .62 in. (15.7 mm) counterbore.Minimum permissible bore ... .3728 in.(9.469 mm)Maximum permissible bore ... .3765 in.(9.563 mm)(7) Depth of bore in head for valve seat insert ... .400 .005 in.(10.16 0.13 mm)(8) Diameter of valve seat insert for exhaust valve ... 1.6870 .0005 in.(42.850 0.013 mm) Diameter of counterbore in head ... 1.6835 .0010 in.(42.761 0.025 mm)Diameter of valve seat insert for intake valve ... 1.8120 .0005 in.(46.025 0.013 mm)Diameter of counterbore in head ... 1.8085 .0010 in.(45.936 0.025 mm)
VALVE GUIDE WITH NO SHOULDER(9) Distance between top of valve guide and cylinder head (valve guides with no shoulders) ... 1.032 .020 in.(26.21