0513923 JOHNSON PLATE, Power pack mtg.

Illustration 1 g00489235
Note: Refer to the following publications for reusability of the valve and valve springs.
Guidelines for Reusable Parts, SEBF8002
Guidelines for Reusable Parts, SEBF8034 (1) 4W-2472 Spring Assembled length ... 50.24 mm (1.978 inch) Load at assembled length ... 178 18 N (40 4.1 lb) Operating length (minimum) ... 35.97 mm (1.416 inch) Load at minimum operating length ... 343 17 N (77.2 3.8 lb) Free length after test ... 65.7 mm (2.60 inch) Outside diameter ... 25.13 mm (.989 inch) Color code ... Orange stripe or blue stripe (2) 4W-2471 Spring Assembled length ... 53.24 mm (2.096 inch) Load at assembled length ... 245 24 N (55.1 5.4 lb) Operating length (minimum) ... 38.96 mm (1.534 inch) Load at minimum operating length ... 805 40 N (181.1 9.0 lb) Free length after test ... 59.46 mm (2.341 inch) Outside diameter ... 37.31 mm (1.469 inch) Color code ... Orange stripe or blue stripe (3) Height to top of the valve guide ... 27.2 0.8 mm (1.07 .03 inch) (4) Diameter of new valve stem ... 9.441 0.008 mm (.3717 .0003 inch)Note: Coat the inlet and exhaust valve stems with 8T-2998 Lubricant prior to installation in the cylinder head.The valves can be reused if the minimum dimensions for the valve stems are met. Exhaust valve ... 9.408 mm (.3704 inch) Inlet valve ... 9.408 mm (.3704 inch)Bore of the installed valve guide ... 9.487 0.025 mm (.3735 .0010 inch)The valve guide can be reused. The valve guide bore must not be larger than the following value. ... 9.538 mm (.3755 inch) (5) Diameter of valve head Exhaust valve ... 41.81 0.13 mm (1.646 0.005 inch) Inlet valve ... 44.98 0.13 mm (1.771 0.005 inch) (6) Angle of valve face Inlet valve ... 29 1/4 1/4 degrees Exhaust valve ... 44 1/4 1/4 degrees
Illustration 2 g00489418
(7) Depth of bore in head for valve seat insert ... 13.01 0.15 mm (.512 .006 inch) (8) Valve seat insert Diameter of valve seat insert for intake valve ... 46.025 0.013 mm (1.8120 .0005 inch) Bore in head for valve seat insert for intake valve ... 45.949 0.025 mm (1.8090 .0010 inch) Diameter of valve seat insert for exhaust valve ... 42.850 0.013 mm (1.6870 .0005 inch) Bore in head for valve seat insert for exhaust valve ... 42.774 0.025 mm (1.6840 .0010 inch) Interference fit between valve seat insert and cylinder head ... 0.069 mm (.0027 inch)Note: Cool the valve seat insert to -62°C (-80°F) in order to insert the valve seat insert into the cylinder head. (9) Angle of face of valve seat insert Inlet valve seat insert ... 30 1/4 1/2 degrees Exhaust valve seat insert ... 45 1/4 1/2 degrees (10) Distance (maximum) from closed valve to cylinder head surface Distance into cylinder head surface ... 1.22 mm (.048 inch) Distance out of cylinder head surface ... 0.20 mm (.008 inch) (11) Outside diameter of the face of the valve seat insert Exhaust valve ... 40.41 0.13 mm (1.591 .005 inch) Intake valve ... 44.04 0.13 mm (1.734 .005 inch) (12) Reusability guideline for the thickness of the valve lip Exhaust valve ... 2.03 mm (.080 inch) Intake valve ... 2.51 mm (.099 inch)