105489-3745 ZEXEL 9 420 611 604 BOSCH GOVERNOR 9420611604 1054893745

Intake and exhaust valve stems are to be coated with 8T2998 Break-in Lubricant prior to installation in the cylinder head. For removing and installation of valve guides and valve seat inserts, use 1U6685 Tool Group.(1) Exhaust valve.(2) Intake valve.(3) 7C4273 Spring for intake valves. Free length ... 71.0 mm (2.80 in)Assembled length ... 65.86 mm (2.593 in)Load at assembled length ... 217 22 N (49 5 lb)Minimum operating length ... 50.7 mm (2.00 in)Load at minimum operating length ... 858 40 N (193 9 lb)(3) 6I2307 Spring for exhaust valves. Free length ... 81 mm (3.19 in)Assembled length ... 70.8 mm (2.787 in)Load at assembled length ... 612 31 N (138 7 lb)Minimum operating length ... 59.0 mm (2.32 in)Load at minimum operating length ... 1325 66 N (298 15 lb)(4) Height to top of valve guides ... 23.0 0.5 mm (.906 .020 in)(5) Diameter of valve stems (new) ... 8.000 0.008 mm (.3150 .0003 in) "Use again" minimum diameter of valve ... 7.965 mm (.3136 in)Bore in valve guides with guides installed in head ... 8.045 0.010 mm (.3167 .0004 in)"Use again" maximum bore in valve guides with guides installed in head ... 8.080 mm (.3181 in)(6) Diameter of valve head: Intake valve ... 47.00 0.13 mm (1.850 .005 in)Exhaust valve ... 40.00 0.13 mm (1.575 .005 in)(7) Angle of valve faces: Intake valve ... 29.75 .25 degreesExhaust valve ... 45 .25 degrees (8) Diameter of valve seat inserts: Intake valve ... 50.000 0.013 mm (1.9685 .0005 in)Exhaust valve ... 43.000 0.013 mm (1.6929 .0005 in)Bore in head for valve seat insert:Intake valve ... 49.931 0.013 mm (1.9658 .0005 in)Exhaust valve ... 42.931 0.013 mm (1.6902 .0005 in)Valve seat insert must be shrunk by reduced temperature before installing in head.(9) Angle of valve seat inserts: Intake valve ... 30.25 1 degreesExhaust valve ... 45.5 1 degrees(10) Depth of bore in head for valve seat insert ... 10.00 0.13 mm (.394 .005 in)(11) Outside diameter of the seating face of the valve seat insert: Intake valve ... 45.88 0.085 mm (1.806 .003 in)Exhaust valve ... 39.135 0.046 mm (1.541 .002 in)(12) "Use again" thickness of valve lip: Intake valve ... 1.80 mm (.071 in)Exhaust valve ... 1.50 mm (.059 in)(13) Distance from head of valve to the cylinder head face (valve closed): Exhaust valveMaximum permissible ... 2.22 mm (.087 in)Minimum permissible ... 1.51 mm (.059 in)Intake valveMaximum permissible ... 2.05 mm (.081 in)Minimum permissible ... 1.13 mm (.044 in)