159210-5500 ZEXEL 9 421 612 308 BOSCH GOVERNOR SPRING 9421612308 1592105500 1157233110

(1) 7S7144 Spring for valves (new): Length under test force ... 1.766 in.(44.86 mm)Test force ... 57.7 4.5 lb.(257 20 N)Use again minimum load at length under test force ... 46.5 lb.(207 N)Length of spring at valve open position ... 1.271 in.(32.28 mm)Use again minimum load at valve open position ... 144 lb.(640 N)Free length after test ... 2.05 in.(52.1 mm)Outside diameter ... 1.386 in.(35.20 mm)Spring must not be bent more than ... .072 in.(1.83 mm)(2) Height to top of valve guide ... .875 in.(22.23 mm)(3) Diameter of valve stem (new) ... .3717 .0003 in.(9.441 0.008 mm) Use again minimum diameter ... .3704 in.(9.408 mm)Bore in valve guide with guide installed in the head (new) ... .3733 .0010 in.(9.482 0.025 mm)Maximum permissible bore (worn) ... .3771 in.(9.578 mm)(4) Valve lip thickness: 8N875 Exhaust ValveUse again minimum ... .106 in.(2.69 mm)7S8809 Intake ValveUse again minimum ... .106 in.(2.69 mm)(5) Diameter of valve head: Exhaust valve ... 1.896 .005 in.(48.16 0.13 mm)Intake valve ... 2.020 .005 in.(51.31 0.13 mm)(6) Angle of valve face ... 291/4° (7) Depth of bore in head for valve seat insert: Exhaust (5S7221) ... .449 .005 in.(11.40 0.13 mm)Intake Earlier (5S7218) ... .449 .005 in.(11.40 0.13 mm)Later (7N4448) ... .349 .005 in.(8.86 0.13 mm)(8) Diameter of valve seat insert: Exhaust (5S7221) ... 2.0035 .0005 in.(50.889 0.013 mm)Intake Earlier (5S7218) ... 2.1285 .0005 in.(54.064 0.013 mm)Later (7N4448) ... 2.0485 .0005 in.(52.032 0.013 mm)Bore in head for valve seat insert:Exhaust (5S7221) ... 2.0005 .0005 in.(50.813 0.013 mm)Intake Earlier (5S7218) ... 2.1255 .0005 in.(53.988 0.013 mm)Later (7N4448) ... 2.0457 .0005 in.(51.961 0.013 mm)(9) Angle of face of valve seat insert ... 30°(10) Maximum permissible width of valve seat (intake and exhaust) ... .076 in.(1.93 mm) Minimum permissible width of valve seat (intake and exhaust) ... .045 in.(1.14 mm)(11) Dimension from top of closed valve to face of head: Maximum permissible dimension for 8N875 Exhaust Valve ... .163 in.(4.14 mm)Minimum permissible dimension for 8N875 Exhaust Valve ... .079 in.(2.01 mm)Maximum permissible dimension for 7S8809 Intake Valve ... .140 in.(3.56 mm)Minimum permissible dimension for 7S8809 Intake Valve ... .066 in.(1.68 mm)(12) Outside diameter of the face of the valve seat or valve seat insert: Exhaust seat ... 1.810 in.(45.97 mm)Maximum permissible exhaust seat ... 1.860 in.(47.24 mm)Intake seat ... 1.934 in.(49.12 mm)Maximum permissible, intake seat ... 1.984 in.(50.39 mm)(13) Angle to grind seat face of the insert to get a reduction of maximum seat diameter ... 15°