Usage:
Typical Example
NOTE: 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)
Length of spring at valve open position ... 39.0 mm (1.54 in)
Use again minimum load at valve open position ... 805 ± 40 N (181 ± 9 lb)
Free length after test ... 59.5 mm (2.34 in)
Outside diameter ... 37.31 mm (1.469 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)
Length of spring at valve open position ... 36.0 mm (1.42 in)
Use again minimum load at valve open position ... 343 ± 17 N (77 ± 4 lb)
Free length after test ... 65.7 mm (2.60 in)
Outside diameter ... 25.13 mm (.989 in)
(2) Height to top of valve guide ... 27.2 ± 0.8 mm (1.07 ± .03 in)
(3) Diameter of valve stem (new) ... 9.441 ± 0.010 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 (measured .750 from end of guide) ... 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 degrees
Angle 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 degrees
Angle of face of exhaust valve seat insert ... 45 ± 1 degrees
(9) Dimension from end of closed valve to machined face of head.
Maximum permissible dimension:
New inlet and exhaust valves.
Below (recessed from) machined face ... 1.22 mm (.048 in)
Above (extended from) machined face ... 0.04 mm (.0016 in)
Reconditioned inlet and exhaust valves.
Below (recessed from) machined face ... 1.70 mm (.067 in)
Above (extended from) machined face ... 0.04 mm (.0016 in)
(10) Outside diameter of the face of the valve seat insert:
Exhaust seat ... 39.268 ± 0.013 mm (1.5460 ± .0005 in)
Inlet seat ... 40.894 ± 0.013 mm (1.6100 ± .0005 in)
(11) "Use again" thickness of valve lip:
Exhaust valve ... 2.06 mm (.081 in)
Inlet valve ... 2.51 mm (.099 in)