146502-0920 ZEXEL 9 461 610 249 BOSCH GOVERNOR COVER 9461610249 1465020920 19240v0701

GUIDELINES FOR REUSABLE PARTS; VALVES AND VALVE SPRINGS, Form SEBF8002, has the procedure necessary for checking used valves and valve springs.(1) 4N5906 Spring for valves (new): Length under test force ... 2.165 in.(54.9 mm)Test force ... 77.0 7.6 lb.(344 34 N)Use again minimum load at length under test force ... 65.4 lb.(291 N)Length of spring at valve open position ... 1.690 in.(42.93 mm)Use again minimum load at valve open position ... 183.6 lb.(817 N)Free length after test ... 2.47 in.(62.7 mm)Outside diameter ... 1.250 in.(31.75 mm)Spring must not be bent more than ... .086 in.(2.18 mm)(2) Height to top of valve guide ... 1.27 .03 in.(32.3 0.8 mm)(3) Diameter of valve stem (new) ... .3717 .0003 in.(9.441 0.008 mm) Use again minimum:4N5653 Exhaust ... Do Not Use Again4N5654 Intake ... .3704 in.(9.408 mm)Bore in valve guide with guide installed in the head (new) ... .3735 .0010 in.(9.487 0.025 mm)(4) Diameter of valve head: Exhaust valve ... 1.646 .005 in.(41.81 0.13 mm)Intake valve ... 1.771 .005 in.(44.98 0.13 mm)(5) Angle of intake valve face ... 291/4° 1/4°Angle of exhaust valve face ... 441/4° 1/4° (6) Depth of bore in head for valve seat insert ... .512 .015 in.(13.00 0.38 mm)(7) Diameter of valve seat insert for exhaust valve ... 1.6870 .0005 in.(42.850 0.013 mm) Bore in head for valve seat insert for exhaust valve ... 1.684 .001 in.(42.77 0.03 mm)Diameter of valve seat insert for intake valve ... 1.8120 .0005 in.(46.025 0.013 mm)Bore in head for valve seat insert for intake valve ... 1.809 .001 in.(45.95 0.03 mm)(8) Angle of face of intake valve seat insert ... 301/4° 1/2°Angle of face of exhaust valve seat insert ... 451/4° 1/2°(9) Dimension from top of closed valve to face of head: Maximum permissible dimension for intake and exhaust ... .048 in.(1.22 mm)Minimum permissible dimension for intake and exhaust ... .008 in.(0.20 mm)(10) Outside diameter of the face of the valve seat insert: Exhaust seat ... 1.591 .005 in.(40.41 0.13 mm)Intake seat ... 1.734 .005 in.(44.04 0.13 mm)(11) "Use again" thickness of valve lip: Exhaust valve ... .080 in.(2.03 mm)Intake valve ... .099 in.(2.51 mm)