105489-3872 ZEXEL 9 420 613 718 BOSCH GOVERNOR 9420613718 1054893872

Guidelines For Reusable Parts; Valves And Valve Springs, SEBF8002 and SEBF8034 have the procedure and specifications necessary for checking used valves and valve springs.(1) 4W2471 Spring for valves (outer) (new): Length under test force ... 53.24 mm (2.096 in)Test force ... 245 24 N (55 5 lb)Use again minimum load at length under test force ... 211 N (48 lb)Length of spring at valve open position ... 39.0 mm (1.54 in)Use again minimum load at valve open position ... 755 N (170 lb)Free length after test ... 59.5 mm (2.34 in)Outside diameter ... 37.31 mm (1.469 in)Spring must not be bent more than ... 2.10 mm (.083 in)(1) 4W2472 Spring for valves (inner) (new): Length under test force ... 50.24 mm (1.978 in)Test force ... 178 18 N (40 4 lb)Use again minimum load at length under test force ... 155 N (35 lb)Length of spring at valve open position ... 36.0 mm (1.42 in)Use again minimum load at valve open position ... 321 N (72 lb)Free length after test ... 65.7 mm (2.60 in)Outside diameter ... 25.13 mm (.989 in)Spring must not be bent more than ... 2.30 mm (.091 in)(2) Height to top of valve guide ... 27.2 .8 mm (1.07 .03 in)(3) Diameter of valve stem (new) ... 9.441 .01 mm (.3717 .0004 in)Use again minimum diameter of valve stems:Exhaust ... 9.408 mm (.3704 in)Inlet ... 9.408 mm (.3704 in)Bore in valve guide with guide installed in the head (new) ... 9.487 0.025 mm (.3735 .0010 in)Use again dimension for valve guide bore ... 9.538 mm (.3755 in)(4) Diameter of valve head: Exhaust valve ... 41.81 0.13 mm (1.646 .005 in)Inlet valve ... 44.98 0.13 mm (1.771 .005 in)(5) Angle of inlet valve face ... 29 1/4 1/4 degreesAngle of exhaust valve face ... 44 1/4 1/4 degrees (6) Depth of bore in head for valve seat insert ... 13.01 0.35 mm (.512 .014 in)(7) Diameter of valve seat insert for inlet valve ... 46.025 0.013 mm (1.8120 .0005 in) Bore in head for valve seat insert for inlet valve ... 45.949 0.025 mm (1.8090 .0010 in)Diameter of valve seat insert for exhaust valve ... 42.850 0.013 mm (1.6870 .0005 in)Bore in head for valve seat insert for exhaust valve ... 42.774 0.025 mm (1.6840 .0010 in)(8) Angle of face of inlet valve seat insert ... 30 1/4 1/2 degreesAngle of face of exhaust valve seat insert ... 44 3/4 1/2 degrees(9) Dimension from end of closed valve to machined face of head. Maximum permissible dimension:Below (recessed from) machined face ... 1.22 mm (.048 in)Above (extended from) machined face ... 0.20