CYLINDER HEAD AS 1557961 - Caterpillar

Illustration 1 g01347084
(1) 7S-7144 Spring Length under test force ... 44.86 mm (1.766 inch) Test force ... 257 25 N (58 5.6 lb) Length of the spring at the valve open position ... 32.28 mm (1.271 inch) Free length after test ... 52.07 mm (2.050 inch) Outside diameter ... 35.21 mm (1.386 inch) (2) Valves Diameter of the new inlet valve ... 9.441 0.008 mm (0.3717 0.0003 inch) Diameter of the new exhaust valve ... 9.441 0.010 mm (0.3717 0.0004 inch)Minimum inside diameter of the new valve guide that is installed in the cylinder head group ... 9.477 mm (0.3731 inch) (A) Height to the top of the valve guide ... 16.22 0.25 mm (0.639 0.010 inch) (B) Valve lip The thickness of the valve lip on the inlet valve ... 3.277 0.127 mm (0.1290 0.0050 inch) The thickness of the valve lip on the exhaust valve ... 3.107 0.127 mm (0.1223 0.0050 inch) (C) Diameter of the valve head Exhaust valve ... 48.16 0.13 mm (1.896 0.005 inch) Inlet valve ... 51.31 0.13 mm (2.020 0.005) (D) Angle of the valve face ... 29.25 0.25 degrees
Illustration 2 g01347092
(E) Depth of the bore in the cylinder head for the valve seat insert ... 12.28 0.13 mm (0.483 0.005 inch) (F) Valve seat insert Diameter of the valve seat insert for the exhaust valve ... 50.889 0.013 mm (2.0035 0.0005 inch) Bore in the head for the valve seat insert for the exhaust valve ... 50.813 0.030 mm (2.0005 0.0012 inch) Diameter of the valve seat insert for the inlet valve ... 52.032 0.013 mm (2.0485 0.0005 inch) Bore in the head for the valve seat insert for the inlet valve ... 51.956 0.030 mm (2.0455 0.0012 inch) (G) Dimension from the top of the closed valve to the face of the head Minimum permissible dimension for the exhaust valve ... 0.66 mm (0.026 inch) Minimum permissible dimension for the inlet valve ... 0.15 mm (0.006 inch) (H) Angle of the face of the valve seat insert ... 30.25 0.50 degrees (J) Width of the valve seat insert for the inlet valve and the exhaust valve Maximum permissible width ... 1.93 mm (0.076 inch) Minimum permissible width ... 1.14 mm (0.045 inch) (K) Outside diameter of the face of the valve seat insert Exhaust seat ... 44.907 mm (1.7680 inch) Inlet seat ... 48.260 mm (1.9000 inch) (L) Grind the valve seat insert to the following angle in order to get a reduction of the maximum seat diameter. ... 15 degrees