154179-3620 ZEXEL 9 421 616 053 BOSCH HEADLESS SCREW 9421616053 1541793620 1157232800

(1) 7S7144 Spring for valves (new): Length under test force ... 44.86 mm (1.766 in)Test force ... 257 25 N (57.7 4.5 lb)Length of spring at valve open position ... 32.28 mm (1.271 in)Load at minimum operating length ... 708 35 N (160 8 lb)Free length after test ... 52.07 mm (2.05 in)Outside diameter ... 35.21 mm (1.386 in)Spring must not be bent more than ... 1.82 mm (.072 in)(2) Height to top of valve guide ... 22.23 0.25 mm (.875 .010 in)(3) Diameter of valve stem (new) ... 9.441 0.008 mm (.3717 .0003 in) Use again minimum diameter ... 9.408 mm (.3704 in)Bore in valve guide with guide installed in the head.Minimum permissible (new) ... 9.456 mm (.3723 in)Maximum permissible (worn) ... 9.581 mm (.3772 in)(4) Valve lip thickness: 6N9916 Exhaust Valve Use again minimum ... 2.69 mm (.106 in)2W2620 Intake Valve Use again minimum ... 2.69 mm (.106 in)6N9915 Intake Valve Use again minimum ... 2.44 mm (.096 in)(5) Diameter of valve head: Exhaust valve ... 48.16 0.13 mm (1.896 .005 in)Intake valve ... 51.31 0.13 mm (2.020 .005 in)(6) Angle of valve face ... 29 1/4 1/4° (7) Depth of bore in head for valve seat insert ... 12.28 0.13 mm (.483 .005 in)(8) Diameter of valve seat insert for exhaust valve ... 50.889 0.013 mm (2.0035 .0005 in) Bore in head for valve seat insert for exhaust valve ... 50.813 0.030 mm (2.0005 .0012 in)Diameter of valve seat insert for intake valve ... 52.032 0.013 mm (2.0485 .0005 in)Bore in head for valve seat insert for intake valve ... 51.956 0.030 mm (2.0455 .0012 in)(9) Angle of face of valve seat insert ... 30 1°(10) Maximum permissible width of valve seat (intake and exhaust) ... 1.93 mm (.076 in) Minimum permissible width of valve seat (intake and exhaust) ... 1.14 mm (.045 in)(11) Dimension from top of closed valve to face of head: Minimum permissible dimension for 6N9916 Exhaust Valve ... 0.66 mm (.026 in)Minimum permissible dimension for 6N9915 or 2W2620 Intake Valve ... 0.15 mm (.006 in)(12) Outside diameter of the face of the valve seat insert: Exhaust seat ... 46.02 mm (1.812 in)Maximum permissible, exhaust seat ... 47.29 mm (1.862 in)Intake seat ... 49.28 mm (1.940 in)Maximum permissible, intake seat ... 50.55 mm (1.990 in)(13) Angle to grind seat face of the insert to get a reduction of maximum seat diameter ... 15°