PIN 6J5985 - Caterpillar

Turbocharged Engines and Turbocharged Aftercooled Engines
Illustration 1 g01345407
A cross section of a cylinder head for a turbocharged engine and turbocharged aftercooled engines
(1) Valve springThe installed length of the valve springs ... 36.17 mm (1.4240 inch)The load for the installed valve spring ... 312 N (70 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 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 Disassembly and Assembly 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 0.062 mm (0.0016 to 0.0024 inch)Overall length of the exhaust valve ... 128.184 to 128.634 mm (5.0466 to 5.0643 inch)The face of the exhaust valve is recessed below the cylinder head by the following amount.Turbocharged engines and turbocharged aftercooled engines ... 1.55 to 1.81 mm (0.0610 to 0.0713 inch)Service limit ... 2.06 mm (0.0811 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 ... 128.838 to 129.288 mm (5.0724 to 5.0901 inch)The face of the inlet valve is recessed below the cylinder head by the following amount.Turbocharged engines and turbocharged aftercooled engines ... 1.60 to 1.85 mm (0.0630 to 0.0728 inch)Service limit ... 2.09 mm (0.0823 inch) (6) Exhaust valve face angle from the horizontal axisValve face angle ... 30 degreesValve seat angle ... 30 degrees (7) Diameter of the exhaust valve head ... 41.51 to 41.75 mm (1.634 to 1.643 inch) (8) Diameter of the head of the inlet valve ... 46.20 to 46.45 mm (1.8189 to 1.8287 inch) (9) Angle of the inlet valve face from the horizontal axisValve face angle ... 30 degreesValve seat angle ... 30 degreesThe valve lash is the following value when the engine is cold:Inlet valves ... 0.20 mm (0.008 inch)Exhaust valves ... 0.45 mm (0.018 inch)
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