C27 and C32 Generator Set Engines Caterpillar

Cylinder Head Valves

Usage:

C27 2A3

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Illustration 1	g02590237

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Table 1
Specification for 223-6431 Cylinder Head Gp
Item	Qty	Part	Specification Description
1	24	211-3123 Spring	Length under test force is 67.12 mm (2.643 inch). Test force is 320 ± 25 N (71.9 ± 5.6 lb). Approximate free length after test is 76.70 mm (3.020 inch).
2	24	211-3122 Spring	Length under test force is 60.14 mm (2.368 inch). Test force is 150 ± 12 N (33.7 ± 2.7 lb). Approximate free length after test is 71.70 mm (2.823 inch).
3	24	122-7375 Valve Guide	Height (A) to the step that is in the valve guide is 35.0 ± 0.5 mm (1.38 ± 0.02 inch).
Apply 1E1867B to the inner diameter of the valve guides immediately prior to the installation of inlet valve (4) and exhaust valve (5) into the cylinder head.
4	12	153-7023 Inlet Valve	Diameter is 47.00 ± 0.13 mm (1.850 ± 0.005 inch). Valve stem diameter is 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch). Face angle is 29.25 ± 0.25 degrees.
5	12	153-7024 Exhaust Valve	Diameter is 41.81 ± 0.13 mm (1.646 ± 0.005 inch). Valve stem diameter is 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch). Face angle is 45.75 ± 0.25 degrees.
Shrink the valve seat inserts by reducing the temperature. Shrinking the valve seat inserts allows placement into the counterbore.
6	12	224-3983 Seat Insert	Face angle is 30.25 ± 0.25 degrees. Depth of the bore in the cylinder head is 14.00 ± 0.05 mm (0.551 ± 0.002 inch). Outside diameter is 48.025 ± 0.013 mm (1.8907 ± 0.0005 inch). Bore in the cylinder head is 47.950 ± 0.025 mm (1.8878 ± 0.0010 inch).
7	12	226-5561 Valve Seat Insert	Face angle is 45.25 ± 0.25 degrees. Depth of the bore in the cylinder head is 13.90 ± 0.05 mm (0.547 ± 0.002 inch). Outside diameter is 42.840 ± 0.013 mm (1.6866 ± 0.0005 inch). Bore in the cylinder head is 42.774 ± 0.025 mm (1.6840 ± 0.0010 inch).

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