28203 Mercury BUMPER, STEERING ARM

Illustration 1 g01411609
(2) Valve stem seal (1) Spring Length under test force ... 44.0 mm (1.73 inch) Test force ... 223 to 246 N (50 to 55 lb) Free length after test ... 56.4 mm (2.22 inch) Maximum bend in spring ... 2 degrees (A) Height to top of valve guide ... 17.00 0.30 mm (0.669 0.012 inch) (B) Specifications for the valve stemsDiameter of inlet valve stem Maximum ... 7.955 mm (0.3132 inch) Minimum ... 7.940 mm (0.3126 inch) Service limit ... 7.900 mm (0.3110 inch)Clearance of inlet valve stem to valve guide Minimum ... 0.055 mm (0.0022 inch) Maximum ... 0.085 mm (0.0033 inch) Service limit ... 0.150 mm (0.0059 inch)Diameter of exhaust valve stem Maximum ... 7.940 mm (0.3126 inch) Minimum ... 7.920 mm (0.3118 inch) Service limit ... 7.850 mm (0.3091 inch)Clearance of exhaust valve stem to valve guide Minimum ... 0.070 mm (0.0028 inch) Maximum ... 0.105 mm (0.0041 inch) Service limit ... 0.200 mm (0.0079 inch) (C) Specifications for the valve guidesOutside diameter of the inlet valve guide Minimum ... 13.025 mm (0.5128 inch) Maximum ... 13.035 mm (0.5132 inch)Inside diameter of the inlet valve guide Minimum ... 8.010 mm (0.3154 inch) Maximum ... 8.035 mm (0.3163 inch) Service limit ... 8.09 mm (0.319 inch)Outside diameter of the exhaust valve guide Minimum ... 13.025 mm (0.5128 inch) Maximum ... 13.035 mm (0.5132 inch)Inside diameter of the exhaust valve guide Minimum ... 8.010 mm (0.3154 inch) Maximum ... 8.025 mm (0.3159 inch) Service limit ... 8.12 mm (0.320 inch) (D) Thickness of lip Valve lip thickness for inlet and exhaust valves ... 2.13 mm (0.084 inch) Minimum allowable valve lip thickness for inlet and exhaust valves ... 1.20 mm (0.047 inch) (E) Angle of valve face ... 30 degrees
Illustration 2 g01411615
(F) Depth of bore in cylinder head for valve seat insert ... 9.50 0.10 mm (0.374 0.004 inch) (G) Chamfer of inlet valve ... 40 degreesNote: The depth of the chamfer of the inlet valve is 2.38 0.10 mm (0.094 0.004 inch). (H) Chamfer of exhaust valve ... 45 degreesNote: The depth of the chamfer of the exhaust valve is 2.00 0.10 mm (0.079 0.004 inch). (J) Bore in cylinder head for inlet valve ... 46.000 to 46.025 mm (1.8110 to 1.8120 inch) (K) Bore in cylinder head for exhaust valve ... 39.000 to 39.025 mm (1.5354 to 1.5364 inch)
Illustration 3 g01411620
(L) Width of valve seat ... 1.40 0.20 mm (0.055 0.008 inch)Note: The maximum permissible width of the valve seat is 1.80 mm (0.071 inch). (M) Valve seat angle ... 30 degrees (N) Dimension from top of closed valve to face of headInlet valve Minimum ... 0.3 mm (0.01 inch) Maximum ... 0.5 mm (0.02 inch) Service limit ... 1.1 mm (0.04 inch)Exhaust valve Minimum ... 0.4 mm (0.02 inch) Maximum ... 0.6 mm (0.02 inch) Service limit ... 1.1 mm (0.04 inch)
Illustration 4 g01411624
(3) Pushrod (3) Use a dial indicator in order to check all pushrods for runout. Replace the pushrod if the runout exceeds the following value. ... 0.4 mm (0.02 inch)