BOLT 7X2578 - Caterpillar

Illustration 1 g01395835
Note: Apply 8T-2998 Lubricant to the inner diameter of the valve guides immediately prior to the installation of inlet valve (1) and exhaust valve (2) into the cylinder head. (3) 211-3123 Spring Length under test force ... 67.12 mm (2.643 inch) Test force ... 320 25 N (71.9 5.6 lb) Approximate free length after test ... 76.70 mm (3.020 inch) Outside diameter ... 36.3 mm (1.43 inch) (4) 211-3122 Spring Length under test force ... 60.14 mm (2.368 inch) Test force ... 150 12 N (33.7 2.7 lb) Approximate free length after test ... 71.70 mm (2.823 inch) Outside diameter ... 25.17 mm (0.991 inch) (A) Height to the step that is in the valve guide ... 35.0 0.5 mm (1.38 0.02 inch) (B) New valve stem diameter ... 9.441 0.010 mm (0.3717 0.0004 inch) (C) Diameter of inlet valve ... 47.00 0.13 mm (1.850 0.005 inch) (D) Diameter of exhaust valve ... 41.81 0.13 mm (1.646 0.005 inch) (E) Face angle for inlet valve seat insert ... 30.25 0.25 degrees (F) Face angle for exhaust valve seat insert ... 45.25 0.25 degrees
Illustration 2 g01397152
(G) Angle of valve face Angle of the face of the inlet valve ... 29.25 0.25 degrees Angle of the face of the exhaust valve ... 44.25 0.25 degrees (H) Depth of the bore in the cylinder head for the valve seat insert Inlet ... 14.00 0.05 mm (0.551 0.002 inch) Exhaust ... 13.90 0.05 mm (0.547 0.002 inch)Note: Shrink the valve seat inserts by reducing the temperature. Shrinking the valve seat inserts allows placement into the counterbore. (J) Valve seat insert Diameter of valve seat insert (inlet valve) ... 48.025 0.013 mm (1.8907 0.0005 inch) Bore in cylinder head for valve seat insert (inlet valve) ... 47.950 0.025 mm (1.8878 0.0010 inch) Diameter of valve seat insert (exhaust valve) ... 42.840 0.013 mm (1.6866 0.0005 inch) Bore in cylinder head for valve seat insert (exhaust valve) ... 42.774 0.025 mm (1.6840 0.0010 inch)