159200-4920 ZEXEL 9 421 613 120 BOSCH GOVERNOR HOUSING 9421613120 1592004920 8970143180

Intake and exhaust valve stems are to be coated with 8T2998 Breakin Lubricant prior to installation in the cylinder head.(1) Intake valve.(2) Exhaust valve.(3) Height to top of valve guide ... 28.00 0.05 mm (1.102 .002 in)(4) Outer Valve Spring (7W7082): Assembled length ... 51.69 mm (2.035 in)Load at assembled length ... 240 24 N (54 5 lb)Operating length (min) ... 37.72 mm (1.485 in)Load at min operating length ... 650 32 N (146 7 lb)Free length after test ... 59.89 mm (2.358 in)Outside diameter ... 34.00 mm (1.339 in)(5) Inner Valve Spring (7W7083): Assembled length ... 49.19 mm (1.937 in)Load at assembled length ... 136 14 N (31 3 lb)Operating length (min) ... 35.22 mm (1.387 in)Load at min operating length ... 292 15 N (66 3 lb)Free length after test ... 61.39 mm (2.417 in)Outside diameter ... 23.24 mm (.915 in)(6) Diameter of valve stems (new) ... 9.441 0.008 mm (.3717 .0003 in)Use again minimum:7C1586 Exhaust ... 9.408 mm (.3704 in)7C5215 Intake ... 9.408 mm (.3704 in)Bore in valve guide with guide installed in the head (new) ... 9.484 0.026 mm (.3734 .0010 in)Use again dimension for valve guide bore ... 9.538 mm (.3755 in)(7) Diameter of valve head: Exhaust valve ... 42.00 0.13 mm (1.654 .005 in)Intake valve ... 45.00 0.13 mm (1.772 .005 in)(8) Angle of valve face: Angle of intake valve face ... 29 1/4 1/4°Angle of exhaust valve face ... 44 1/4 1/4° (9) Depth of bore in head for valve seat insert: Intake ... 15.00 0.10 mm (.591 .004 in)Exhaust ... 14.10 0.10 mm (.555 .004 in) Inserts to be shrunk by reduced temperature before being placed in counterbore.(10) Diameter of valve seat insert for intake valve ... 46.025 0.013 mm (1.8120 .0005 in) Bore in head for valve seat insert for intake valve ... 45.950 0.025 mm (1.8091 .0010 in)Diameter of valve seat insert for exhaust valve ... 43.400 0.015 mm (1.7086 .0006 in)Bore in head for valve seat insert for exhaust valve ... 43.320 0.025 mm (1.7055 .0009 in)(11) Angle of face of intake valve seat insert ... 30 1/4 1/2°Angle of face of exhaust valve seat insert ... 44 3/4 1/2°(12) "Use again" thickness of valve lip: Exhaust valve ... 2.03 mm (.080 in)Intake valve ... 2.51 mm (.099 in)