159219-1120 ZEXEL 9 421 619 152 BOSCH SPRING PACK 9421619152 1592191120

Intake and exhaust valve stems are to be coated with 8T2998 Break-in Lubricant prior to installation in the cylinder head.(1) Exhaust valve.(2) Intake valve.(3) 7C4273 Spring for 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)(4) Height to top of valve guides ... 23.0 0.5 mm (.906 .020 in) Install valve guide with 12.065 mm diameter on spring side of the head.Assemble with seal seated against top of valve guide.(5) Diameter of valve stems (new) ... 8.000 0.008 mm (.3150 .0003 in) "Use again" minimum diameter of valve stems ... 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 1/4 1/4°Exhaust valve ... 45 1/4° (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 1°Exhaust valve ... 45 1°(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 ... 45.880 0.085 mm (1.8063 .0033 in)Exhaust valve ... 39.135 0.046 mm (1.5407 .0018 in)(12) "Use again" thickness of valve lip: Intake valve ... 1.80 mm (.071 in)Exhaust valve ... 1.50 mm (.059 in)