C9.3 Engine for Caterpillar Built Machines Cylinder Head Valves Caterpillar

Illustration 1	g01417779

Note: Lubricate the inlet valve stems and the exhaust valve stems with clean engine oil prior to installation into the cylinder head.

(1) Inlet valve

Valve stem diameter ... 8.000 ± 0.010 mm (0.3150 ± 0.0004 inch)

Diameter of valve head ... 39.00 ± 0.13 mm (1.535 ± 0.005 inch)

Angle of valve face ... 60.25 ± 0.25 degrees

(2) Exhaust valve

Valve stem diameter ... 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch)

Diameter of valve head ... 36.00 ± 0.13 mm (1.417 ± 0.005 inch)

Angle of valve face ... 45.75 ± 0.25 degrees

(3) 241-8385 Spring

Length under test force ... 44.0 mm (1.73 inch)

Test force ... 305 ± 15 N (69 ± 3 lb)

Approximate free length after test ... 67.69 mm (2.665 inch)

Outside diameter ... 28.56 mm (1.124 inch)

(4) 190-6117 Spring

Length under test force ... 37.70 mm (1.484 inch)

Test force ... 350 ± 17 N (79 ± 4 lb)

Approximate free length after test ... 57.80 mm (2.276 inch)

Outside diameter ... 31.79 mm (1.252 inch)

(5) 190-6115 Spring

Length under test force ... 36.5 mm (1.44 inch)

Test force ... 187 ± 8 N (42 ± 2 lb)

Approximate free length after test ... 57.80 mm (2.276 inch)

Outside diameter ... 23.18 mm (0.913 inch)

(6) 241-8386 Spring

Length under test force ... 42.8 mm (1.69 inch)

Test force ... 152.5 ± 7.0 N (34.3 ± 1.6 lb)

Approximate free length after test ... 56.68 mm (2.231 inch)

Outside diameter ... 21.33 mm (0.840 inch)

Note: Lubricate the bores in the cylinder head for the valve guides with clean engine oil prior to installation.

(A) Height of the valve guides above the top of the cylinder head ... 12.0 ± 0.5 mm (0.47 ± 0.02 inch)

(7) Valve guide (inlet)

Outside diameter ... 13.030 ± 0.008 mm (0.5130 ± 0.0003 inch)

Bore in the cylinder head for the valve guide ... 13.000 ± 0.013 mm (0.5118 ± 0.0005 inch)

(8) Valve guide (exhaust)

Outside diameter ... 16.000 ± 0.008 mm (0.6299 ± 0.0003 inch)

Bore in the cylinder head for the valve guide ... 15.970 ± 0.013 mm (0.6287 ± 0.0005 inch)

Illustration 2	g01418601
Detail B

Note: Shrink the valve seat inserts by reducing the temperature. Shrinking the valve seat inserts allows placement into the counterbore.

(C) Angle of the face of the valve seat insert

Angle (inlet) ... 30.25 ± 0.25 degrees

Angle (exhaust) ... 45.00 ± 0.25 degrees

(D) Depth of the bore in the cylinder head for the valve seat insert

Depth (inlet) ... 9.30 ± 0.05 mm (0.366 ± 0.002 inch)

Depth (exhaust) ... 10.40 ± 0.05 mm (0.409 ± 0.002 inch)

(E) Outside diameter of the valve seat insert

Diameter (inlet) ... 40.060 ± 0.013 mm (1.5772 ± 0.0005 inch)

Bore in the cylinder head for the valve seat insert (inlet) ... 40.000 ± 0.015 mm (1.5748 ± 0.0006 inch)

Diameter (exhaust) ... 37.560 ± 0.013 mm (1.4787 ± 0.0005 inch)

Bore in the cylinder head for the valve seat insert (exhaust) ... 37.500 ± 0.015 mm (1.4764 ± 0.0006 inch)