PLATE 9G3993 - Caterpillar

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.(44.14 mm)Test force ... 45.0 2.3 lb.(20.4 0.6 kg)Free length after test ... 1.96 in.(49.8 mm)Outside diameter ... 1.215 in.(30.86 mm)(2) Diameter of valve stem (new) ... .3717 .0003 in.(9.441 0.008 mm) Minimum permissible diameter of valve stem (worn) ... .3694 in.(9.38 mm)(3) Minimum permissible thickness of lip (intake valve) (worn) ... .072 in.(1.82 mm) Minimum permissible thickness of lip (exhaust valve) (worn) ... .072 in.(1.82 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(6) Bore in valve guide with guide installed in the head: Smooth bore valve guide ... .3744 to .3758 in.(9.502 to 9.545 mm)Maximum permissible bore (worn) ... .3785 in.(9.614 mm)Grooved 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 with no shoulder:Minimum permissible bore ... .3725 in.(9.462 mm)Maximum permissible bore (worn) ... .3764 in.(9.561 mm)(7) Depth of bore in head for valve seat insert ... .400 .005 in.(10.16 0.13 mm)(8) Diameter of valve seat 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 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 0.51 mm) (10) Angle of face of valve seat insert ... 45°(11) Distance from face of closed valve to bottom face of cylinder head (intake and exhaust): Maximum for intake valve ... .137 in.(3.48 mm)Minimum for intake valve ... .075 in.(1.91 mm)Maximum for exhaust valve ... .137 in.(3.48 mm)Minimum for exhaust valve ... .075 in.(1.91 mm)(12) Angle to grind seat face of the insert to get a reduction of maximum seat diameter ... 15°(13) Maximum permissible width of valve seat (exhaust) ... .100 in.(2.54 mm) Maximum permissible width of valve seat (intake) ... .104 in.(2.64 mm)(14) Outside diameter of the face of the valve seat: Maximum permissible, exhaust seat ... 1.621 in.(41.12 mm)Minimum permissible, exhaust seat ... 1.589 in.(40.36 mm)Maximum permissible, intake seat ... 1.746 in.(44.35 mm)Minimum permissible, intake seat ... 1.714 in.(43.54 mm)