C9.3 Marine Engines Caterpillar

Cylinder Head Valves

Usage:

C9.3 C93

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Illustration 1	g02665396

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Table 1
Specification for 370-4172 Cylinder Head Gp
Item	Qty	Part	Specification Description
1	12	262-2957 Inlet Valve	Before assembly of cylinder head valves, coat the valve guide inside diameter with clean engine oil.
			Diameter of valve head is 41.50 ± 0.13 mm (1.634 ± 0.005 inch).
			Face angle is 60.50 ± 0.25 degrees.
2	12	369-5921 Exhaust Valve	Before assembly of cylinder head valves, coat the valve guide inside diameter with clean engine oil.
			Diameter of valve head is 37.50 ± 0.13 mm (1.476 ± 0.005 inch).
			Face angle is 45.75 ± 0.25 degrees.
3	24	349-5307 Spring	Length under test force is 47.35 mm (1.864 inch).
			Test force is 465.0 ± 23.3 N (104.5 ± 5.2 lb).
			Approximate free length after test is 77.9 mm (3.07 inch).
4	24	349-5303 Spring	Length under test force is 46.15 mm (1.817 inch).
			Test force is 232.5 ± 11.6 N (52.3 ± 2.6 lb).
			Approximate free length after test is 74.60 mm (2.937 inch).
Before assembly of valve guide, coat the cylinder head bore for valve guide with clean engine oil.
5	24	255-8665 Valve Guide	Install the valve guide from the spring side of the cylinder head. Check the inside diameter of the valve guide for distortion after installation into the cylinder head.
			Outside diameter is 13.030 ± 0.008 mm (0.5130 ± 0.0003 inch).
			Inside diameter is 8.072 ± 0.013 mm (0.3178 ± 0.0005 inch).
After assembly of the valve guide into the cylinder head, install the seal onto the top of the valve guide.
A		-	Diameter of valve stem is 8.000 ± 0.010 mm (0.3150 ± 0.0004 inch).

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Illustration 2	g02665477

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Table 2
Item	Qty	Part	Specification Description
B	-	-	Depth of the bore in the cylinder head for the inlet valve seat insert is 9.30 ± 0.05 mm (0.366 ± 0.002 inch).
			Depth of the bore in the cylinder head for the exhaust valve seat insert is 10.40 ± 0.05 mm (0.409 ± 0.002 inch).
C	24	-	Diameter of the inlet 255-8666 Valve Seat Insert is 42.560 ± 0.013 mm (1.6756 ± 0.0005 inch).
			Bore in cylinder head for the inlet valve seat insert is 42.500 ± 0.015 mm (1.6732 ± 0.0006 inch).
			Diameter of the exhaust 262-2959 Valve Seat Insert is 39.060 ± 0.013 mm (1.5378 ± 0.0005 inch).
			Bore in cylinder head for the exhaust valve seat insert is 39.000 ± 0.015 mm (1.5354 ± 0.0006 inch).

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