COLLET AS 4V2577 - Caterpillar

Inlet and Exhaust Valves
Illustration 1 g00688621
(1) Valve springs Length under test force ... 21 mm (1.26 inch) Test force ... 375 to 415 N m (277 to 306 lb ft) (2) Valve spring recess (3) Valve guides Inside diameter of valve guide ... 7.027 to 7.052 mm (0.2767 to 0.2776 inch) Outside diameter of valve guide ... 12.034 to 12.047 mm (0.4738 to 0.4743 inch) Overall length of valve guides ... 45.2 to 45.7 mm (1.78 to 1.80 inch) Projection of the valve guide above the recess for the valve spring (2) ... 7.70 to 7.85 mm (0.303 to 0.309 inch) Maximum permissible clearance of the inlet valve in the valve guide ... 0.24 mm (0.009 inch) Maximum permissible clearance of the exhaust valve in the valve guide ... 0.28 mm (0.011 inch) (4) Exhaust valve stem Diameter of the exhaust valve stem ... 6.945 to 6.960 mm (0.2730 to 0.2740 inch) Overall length of the exhaust valve ... 106.125 to 106.475 mm (4.1780 to 4.1920 inch) (5) Inlet valve stem Diameter of the inlet valve stem ... 6.970 to 6.985 mm (0.2740 to 0.2750 inch) Overall length of the inlet valve ... 106.275 to 106.625 mm (4.1840 to 4.1980 inch) (6) Angle of valve seats Inlet valve ... 45 degrees Exhaust valve ... 45 degrees (7) Diameter of the face of the exhaust valve ... 37.1 to 37.3 mm (1.46 to 1.47 inch)Valve depth below the cylinder head face Minimum ... 0.521 mm (0.0210 inch) Maximum ... 0.887 mm (0.0350 inch) Service wear limit ... 1.14 mm (0.045 inch) (8) Diameter of the face of the inlet valve ... 43.9 to 44.1 mm (1.73 to 1.74 inch)Valve depth below the cylinder head face Minimum ... 0.376 mm (0.0150 inch) Maximum ... 0.730 mm (0.0290 inch) Service wear limit ... 0.98 mm (0.039 inch) (9) Valve seat insertValve lash settingCold engine Inlet valves ... 0.35 mm (0.014 inch) Exhaust valves ... 0.35 mm (0.014 inch)Valve Seat Insert
Illustration 2 g00389415
Recess for a valve seat insertMachine the recess in the head for valve seat inserts to the following dimensions.Inlet Valve Seat (1) Chamfer ... 45 degrees (2) Diameter of the face ... 49.0 to 49.2 mm (1.93 to 1.94 inch) (3) Diameter at bottom of taper ... 45.175 to 45.200 mm (1.7785 to 1.7795 inch) (4) Maximum radius ... 0.38 mm (0.015 inch) (5) Depth of the machined surface in the cylinder head ... 8.35 to 8.55 mm (0.329 to 0.337 inch)Exhaust Valve Seat (1) Chamfer ... 45 degrees (2) Diameter of the face ... 42.3 to 42.5 mm (1.66 to 1.67 inch) (3) Diameter at bottom of taper ... 38.475 to 38.500 mm (1.5148 to 1.5157 inch) (4) Maximum radius ... 0.38 mm (0.015 inch) (5) Depth of machined surface in the cylinder head ... 8.35 to 8.55 mm (0.329 to 0.337 inch)