C15 Petroleum Generator Set Engines Caterpillar

Illustration 1	g01441013
(1) Exhaust valve (2) Intake valve

Note: The inlet valve and exhaust valve stems must be coated with engine oil prior to installation in the cylinder head.

Note: The tips of the inlet valves and exhaust valves must be coated with 8T-2998 Lubricant . The lubricant must be applied after assembly of the retainer.

(3) 137-6718 Spring

Quantity ... 6

Length under test force ... 80.27 mm (3.160 inch)

Test force ... 662 ± 33 N (149 ± 7 lb)

Approximate free length after test ... 92.08 mm (3.625 inch)

Outside diameter ... 28.82 mm (1.135 inch)

(4) 140-6188 Spring

Quantity ... 12

Length under test force ... 60.4 mm (2.38 inch)

Test force ... 302.5 ± 18 N (68 ± 4 lb)

Approximate free length after test ... 67.5 mm (2.66 inch)

Outside diameter ... 28.6 mm (1.13 inch)

(A) Dimension for the valve guides

Height to the top of inlet valve guide ... 23.0 ± 0.5 mm (0.91 ± 0.02 inch)

Height to the top of exhaust valve guide ... 17.8 ± 0.5 mm (0.70 ± 0.02 inch)

Outside diameter of inlet valve guide ... 13.030 ± 0.008 mm (0.5130 ± 0.0003 inch)

Bore in the inlet valve guide after installation ... 8.072 ± 0.013 mm (0.3178 ± 0.0005 inch)

Outside diameter of exhaust valve guide ... 16.000 ± 0.008 mm (0.6299 ± 0.0003 inch)

Bore in the exhaust valve guide after installation ... 10.29 ± 0.08 mm (0.405 ± 0.003 inch)

Note: Install the valve guide from the spring side of the cylinder head.

Note: Assemble the valve guide. Seat the seal against the top of the valve guide.

(B) Diameter of the valve stem

Inlet valve ... 8.000 ± 0.008 mm (0.3150 ± 0.0003 inch)

Exhaust valve ... 9.441 ± 0.010 mm (0.3717 ± 0.0004 inch)

(C) Diameter of the valve head

Inlet valve ... 40.00 ± 0.13 mm (1.575 ± 0.005 inch)

Exhaust valve ... 43.00 ± 0.13 mm (1.693 ± 0.005 inch)

(D) Angle of the valve faces

Inlet valve ... 60.25 ± 0.25 degrees

Exhaust valve ... 45.00 ± 0.25 degrees

Illustration 2	g01441044

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

Inlet valve ... 9.00 ± 0.05 mm (0.354 ± 0.002 inch)

Exhaust valve ... 10.00 ± 0.05 mm (0.394 ± 0.002 inch)

Note: The valve seat insert must be shrunk by reduced temperature before the valve seat insert is installed in the head.

(F) Angle of the valve seat inserts

Inlet valve ... 30.25 ± 0.25 degrees

Exhaust valve ... 45.5 ± 0.25 degrees

(G) Outside diameter of the seating face of the valve seat insert

Inlet valve ... 37.351 mm (1.4705 inch)

Exhaust valve ... 40.800 mm (1.6063 inch)

(H) Dimension for the valve seat inserts

Diameter of inlet valve insert ... 42.000 ± 0.013 mm (1.6535 ± 0.0005 inch)

Diameter of the bore in cylinder head for the inlet valve insert ... 41.931 ± 0.013 mm (1.6508 ± 0.0005 inch)

Diameter of exhaust valve insert ... 46.000 ± 0.013 mm (1.8110 ± 0.0005 inch)

Diameter of the bore in cylinder head for the exhaust valve insert ... 45.931 ± 0.013 mm (1.8083 ± 0.0005 inch)

Note: Do not reuse the valve seat inserts if the outside diameter of the valve seat insert is larger than the specified value.