3176C and 3196 Marine Engines Caterpillar

Illustration 1	g01430723

Note: Coat the inlet valve stems and the exhaust valve stems with 8T-2998 Lubricant prior to installation into the cylinder head.

(1) Inlet valve

(2) Exhaust valve

(A) Height to the step that is in the valve guide ... 22.00 ± 0.50 mm (0.866 ± 0.020 inch)

(3) 214-0586 Outer Valve Spring

Assembled Length ... 52.95 mm (2.085 inch)

Load at assembled length ... 320 ± 31 N (72 ± 7 lb)

Operating length (minimum) ... 37.40 mm (1.472 inch)

Load at minimum operating length ... 860 ± 34 N (193 ± 8 lb)

Free length after test ... 62.70 mm (2.469 inch)

Outside diameter ... 34.00 mm (1.339 inch)

(4) 224-4441 Inner Valve Spring

Assembled Length ... 50.47 mm (1.987 inch)

Load at assembled length ... 160 ± 13 N (36 ± 3 lb)

Operating length (minimum) ... 34.92 mm (1.375 inch)

Load at minimum operating length ... 385 ± 18 N (87 ± 4 lb)

Free length after test ... 64.10 mm (2.524 inch)

Outside diameter ... 23.24 mm (0.915 inch)

(B) New valve stem diameter ... 9.441 ± 0.008 mm (0.3717 ± 0.0003 inch)

The valves can be reused if the minimum dimensions for the valve stems are met.

Inlet ... 9.309 mm (0.3665 inch)

Exhaust ... 9.309 mm (0.3665 inch)

Specifications for the valve guides

After installation into the cylinder head, the valve guide bore is the following value. ... 9.484 ± 0.026 mm (0.3734 ± 0.0010 inch)

The valve guide can be reused. The valve guide bore must not be larger than the following value. ... 9.538 mm (0.3755 inch)

(C) Diameter of valve head

Inlet valve ... 45.00 ± 0.13 mm (1.772 ± 0.005 inch)

Exhaust valve ... 42.00 ± 0.13 mm (1.654 ± 0.005 inch)

(D) Angle of face of valve seat insert

Inlet valve seat insert ... 29.75 ± 0.25 degrees

Exhaust valve seat insert ... 44.75 ± 0.25 degrees

Illustration 2	g01430749

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

Inlet ... 15.00 ± 0.05 mm (0.591 ± 0.002 inch)

Exhaust ... 14.10 ± 0.05 mm (0.555 ± 0.002 inch)

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

(F) Angle of valve face

Angle of the face of the inlet valve ... 29.25 ± 0.25 degrees

Angle of the face of the exhaust valve ... 44.25 ± 0.25 degrees

(G) Valve seat insert

Diameter of valve seat insert (inlet valve) ... 46.025 ± 0.013 mm (1.8120 ± 0.0005 inch)

Bore in cylinder head for valve seat insert (inlet valve) ... 45.961 ± 0.013 mm (1.8095 ± 0.0005 inch)

Diameter of valve seat insert (exhaust valve) ... 43.400 ± 0.015 mm (1.7087 ± 0.0006 inch)

Bore in cylinder head for valve seat insert (exhaust valve) ... 43.320 ± 0.025 mm (1.7055 ± 0.0010 inch)

(H) Minimum thickness of the valve lip

Inlet valve ... 2.51 mm (0.099 inch)

Exhaust valve ... 2.03 mm (0.080 inch)