831905 Mercury SEAL

(1) 3S3018 Spring for valve: Length under test force ... 1.738 in.(44.15 mm)Test force ... 45 2.3 lb.(20.4 1.0 kg)Use again minimum load at length under test force ... 41 lb.(18.6 kg)Length of spring at valve open position ... 1.238 in.(31.45 mm)Use again minimum load at valve open position ... 138 lb.(62.7 kg)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)Minimum permissible diameter of valve stem (worn):7S9345 and 2M6402 Valves ... .3695 in.(9.39 mm)1P1081 and 1P407 Valves ... .3717 .0003 in.(9.441 0.008 mm)Use again minimum diameter of valve stem:1P1081 and 1P407 Valves ... .3704 in.(9.41 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) ... 44 1/4°(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) (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)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 without shoulder:Minimum permissible bore ... .3727 in.(9.467 mm)Maximum permissible bore (worn) ... .3764 in.(9.561 mm)
VALVE GUIDE WITH SHOULDER(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 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):2M6402 ... .1274 in.(3.236 mm)1P407 ... .137 in.(3.48 mm)(Minimum for intake valve):2M6402 ... .0994 in.(2.525 mm)1P407 ... .075 in.(1.91 mm)(Maximum for exhaust valve):7S9345 ... .1276 in.(3.241 mm)1P1041 ... .137 in.(3.48 mm)(Minimum for exhaust valve):7S9345 ... .0990 in.(2.515 mm)1P1041 ... .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.(41.17 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)