PLATFORM AS 1129592 - Caterpillar

Illustration 3 g00517019
Angles and dimensions of the valve seat insert
(12) Valve seat insert
(D) Included angle of the faces
(E) Dimension of chamfer
(F) Vertical angle of chamfer (12) Valve seat insert (D) Included angle of the faces of the valve seat insert Engines with 46 degree valve seats ... 88 degreesEngines with 31 degree valve seats ... 118 degrees (E) Dimension of chamfer for all engines ... 1.10 0.20 mm (0.043 0.008 inch) (F) Angle of chamfer from the vertical for all engines ... 30 degreesType 2 Engines and 7BJ Engines
Note: For a complete description of Type 1 and Type 2 engines, refer to the Specifications Module, "Engine Design" for more information.
Illustration 4 g00294082
Inlet valves and exhaust valves
(1) Single valve springs Length under test force ... 39.0 mm (1.54 inch)Test force ... 246 to 277 N (55 to 62 lb) (2) Valve spring insert for the valve spring (3) Valve guides Inside diameter of finished valve guide ... 9.00 to 9.02 mm (0.354 to 0.355 inch)Outside diameter of inlet valve ... 13.03 to 13.05 mm (0.513 to 0.514 inch)Outside diameter of exhaust valve ... 14.03 to 14.05 mm (0.552 to 0.553 inch)Bore diameter in the cylinder head for the inlet valve guide ... 13.00 to 13.03 mm (0.512 to 0.513 inch)Bore diameter in the cylinder head for the exhaust valve guide ... 14.000 to 14.027 mm (0.5512 to 0.5522 inch)Interference fit of valve guide in the cylinder head ... 0.007 to 0.047 mm (0.0003 to 0.0019 inch)Overall length of inlet and exhaust valve guides ... 51.25 mm (2.012 inch)Projection of valve guide above the valve spring recess (2) ... 14.85 to 15.15 mm (0.585 to 0.596 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. Then, the guides and inserts are cut and reamed in one operation with special tooling. This procedure ensures the concentricity of the valve seat to the valve guide in order to create a seal that is tight. Refer to the Disassembly and Assembly Manual for removal and installation procedures. (4) Diameter of the exhaust valve stem ... 8.94 to 8.96 mm (0.352 to 0.353 inch)Clearance of valve in valve guide ... 0.040 to 0.084 mm (0.0026 to 0.0033 inch)Maximum permissible clearance of valve in valve guide ... 0.104 mm (0.0041 inch)Overall length of the exhaust valve ... 122.65 to 123.30 mm (4.829 to 4.854 inch) (5) Diameter of the inlet valve stem ... 8.953 to 8.975 mm (0.3525 to 0.3533 inch)Clearance of valve in the valve guide ... 0.025 to 0.069 mm (0.001 to 0.003 inch)Maximum permissible clearance of valve in valve guide ... 0.089 mm (0.0035 inch)Overall length of the inlet valve ... 122.65 to 123.30 mm (4.829 to 4.854 inch) (6) Exhaust valve face angle ... 45 degreesValve seat angle ... 46 degreesNote: Some engines may