HOSE AS 3614940 - Caterpillar

Illustration 2 g00809016
Recess for the valve seat insert
(10) Machine the recess in the head for valve seat inserts to the following dimensions.Recess for inlet valve seat for turbocharged engines and turbocharged aftercooled engines (A) ... 10.84 to 11.04 mm (0.4268 to 0.4346 inch) (B) ... 47.820 to 47.845 mm (1.8827 to 1.8837 inch) (C) Maximum radius ... 0.38 mm (0.015 inch)Recess for exhaust valve seat for turbocharged engines and turbocharged aftercooled engines (A) ... 10.84 to 11.04 mm (0.4268 to 0.4346 inch) (B) ... 42.420 to 42.445 mm (1.6701 to 1.6711 inch) (C) Maximum radius ... 0.38 mm (0.015 inch)Naturally Aspirated Engines
Illustration 3 g00294082
Cross section of naturally aspirated cylinder head
(1) Valve springThe installed length of the valve springs ... 33.5 mm (1.318 inch)The load for the installed valve springs ... 254 N (57.1 lb) (2) Valve spring recess (3) The finished valve guidesInside diameter of valve guide ... 9.000 to 9.022 mm (0.3543 to 0.3552 inch)Outside diameter of the exhaust valve guide ... 13.034 to 13.047 mm (0.5131 to 0.5137 inch)Outside diameter of the inlet valve guide ... 13.034 to 13.047 mm (0.5131 to 0.5137 inch)Interference fit of valve guide in cylinder head ... 0.007 to 0.047 mm (0.0003 to 0.0019 inch)Length of Valve guide ... 51.00 to 51.50 mm (2.018 to 2.027 inch)Projection of the valve guide above the valve spring recess (2) ... 12.35 to 12.65 mm (0.486 to 0.498 inch)Note: When new valve guides are installed, new valves and new valve seat inserts must be installed. The valve guides and the valve seat inserts are supplied as partially finished parts. The unfinished valve guides and unfinished valve seat inserts are installed in the cylinder head. The guides and inserts are then cut and reamed in one operation with special tooling. This procedure ensures the concentricity of the valve seat to the valve guide to create a seal that is tight. Refer to the Disassembly and Assembly Manual for removal and installation procedures. (4) Exhaust valveDiameter of the exhaust valve stem ... 8.938 to 8.960 mm (0.3519 to 0.3528 inch)Clearance of valve in valve guide ... 0.040 to 0.840 mm (0.0016 to 0.033 inch)Overall length of the exhaust valve ... 128.92 to 129.37 mm (5.075 to 5.093 inch)The face of the exhaust valve is recessed below the cylinder head by the following amount.Naturally aspirated engines ... 0.53 to 0.81 mm (0.021 to 0.032 inch)Service limit ... 1.06 mm (0.042 inch) (5) Inlet valveDiameter of the inlet valve stem ... 8.953 to 8.975 mm (0.3525 to 0.3533 inch)Clearance of valve in valve guide ... 0.025 to 0.069 mm (0.001 to 0.0027 inch)Overall length of the inlet valve ... 128.92 to 129.37 mm (5.075 to 5.093 inch)The face of the inlet valve is recessed below the cylinder head by the following amount.Naturally aspirated engines ... 0.58 to 0.84 mm (0.023 to 0.033 inch)Service limit ... 1.09 mm (0.043 inch) (6) Exhaust valve face angle from the horizontal axisValve face angle