3054 and 3056 Industrial and Generator Set Engines Caterpillar

Cylinder Head Valves

Usage:

3054 2PW

Show/hide table




Illustration 1	g00294082

(1) Single valve springs

Length under test force ... 39.0 mm (1.54 inch)

Test force ... 246 to 277.5 N (55.3 to 62.4 lb)

(2) Valve spring recess for the valve spring

(3) Valve guides for the inlet and exhaust valves

Inside diameter ... 9.000 to 9.022 mm (0.3543 to 0.3552 inch)

Outside diameter of inlet valve guide ... 13.034 to 13.047 mm (0.5131 to 0.5137 inch)

Outside diameter of exhaust valve guide ... 14.034 to 14.047 mm (0.5525 to 0.5530 inch)

Bore diameter in cylinder head for inlet valve guide ... 13.000 to 13.027 mm (0.5118 to 0.5128 inch)

Bore diameter in cylinder head for exhaust valve guide ... 14.000 to 14.027 mm (0.5512 to 0.5522 inch)

Interference fit of valve guide in cylinder head ... 0.007 to 0.047 mm (0.0003 to 0.0019 inch)

Overall length of inlet and exhaust valve guides ... 51.25 mm (2.018 inch)

Projection of valve guide above valve spring recess (2) ... 14.85 to 15.15 mm (0.585 to 0.596 inch)

Note: When new valve guides are installed, new valves and new valve seat inserts must be installed. The valve guides and the valve seat inserts are supplied as partially finished parts. The unfinished valve guides and unfinished valve seat inserts are installed in the cylinder head. Then, the guides and inserts are cut and reamed in one operation with special tooling. This procedure ensures the concentricity of the valve seat to the valve guide in order to create a seal that is tight. Refer to the Disassembly and Assembly Manual for removal and installation procedures.

(4) Diameter of the exhaust valve stem ... 8.938 to 8.960 mm (0.3519 to 0.3528 inch)

Clearance of valve in valve guide ... 0.040 to 0.084 mm (0.0016 to 0.0033 inch)

Maximum permissible clearance of valve in valve guide ... 0.104 mm (0.0041 inch)

Overall length of the exhaust valve ... 122.65 to 123.30 mm (4.829 to 4.854 inch)

(5) Diameter of the inlet valve stem ... 8.953 to 8.975 mm (0.3525 to 0.3533 inch)

Clearance of valve in valve guide ... 0.025 to 0.069 mm (0.001 to 0.0027 inch)

Maximum permissible clearance of valve in valve guide ... 0.089 mm (0.0035 inch)

Overall length of the inlet valve ... 122.65 to 123.30 mm (4.829 to 4.854 inch)

(6) Angle of exhaust valve face ... 45 degrees

Note: Some engines may have valve face angles of 30 degrees.

(7) Diameter of the exhaust valve head ... 40.88 to 41.12 mm (1.609 to 1.619 inch)

Valve depth below the cylinder head face

Minimum ... 1.50 mm (0.059 inch)

Maximum ... 1.80 mm (0.071 inch)

Service wear limit ... 2.05 mm (0.081 inch)

(8) Diameter of the inlet valve head ... 42.88 to 43.12 mm (1.688 to 1.698 inch)

Valve depth below the cylinder head face

Minimum ... 1.40 mm (0.055 inch)

Maximum ... 1.70 mm (0.067 inch)

Service wear limit ... 1.95 mm (0.077 inch)

(9) Angle of inlet valve face ... 45 degrees

Note: Some engines may have valve face angles of 30 degrees.

The valve lash is the following value when the engine is hot or cold.

Inlet valves ... 0.20 mm (0.008 inch)

Exhaust valves ... 0.45 mm (0.018 inch)

Show/hide table




Illustration 2	g00891335

(10) Machine the recess in the head for valve seat inserts to the following dimensions.

Inlet

(A) ... 10.585 to 10.715 mm (0.4167 to 0.4219 inch)

(B) ... 45.535 to 45.560 mm (1.7927 to 1.7937 inch)

Exhaust

(A) ... 10.585 to 10.715 mm (0.4167 to 0.4219 inch)

(B) ... 43.535 to 43.560 mm (1.7139 to 1.7149 inch)

Note: When a new valve seat insert is installed, a new valve and valve guide must be installed. Refer to the Disassembly and Assembly Manual for removal and installation procedures.

Show/hide table