3054 Engine Caterpillar

Cylinder Head Valves

Usage:

554 1AM

Type 1 Engines and 9RM Engines

Note: For a complete description of Type 1 and Type 2 engines, refer to the Specifications Module, "Engine Design" for more information.

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Illustration 1	g00295326
Inlet valves and exhaust valves

Double valve springs:

(1) Outer spring

Length under test force ... 35.8 mm (1.41 inch)

Test force ... 176 to 195 N (40 to 44 lb)

(2) Inner spring

Length under test force ... 34.0 mm (1.34 inch)

Test force ... 89 to 104 N (20 to 23 lb)

Single valve springs (not shown)

Length under test force ... 40.0 mm (1.57 inch)

Test force ... 310 to 344 N (70 to 77 lb)

Free length after test ... 53.4 mm (2.10 inch)

(3) Valve spring recess for the valve spring

(4) Valve guides for the inlet and exhaust valves

Inside diameter ... 9.51 to 9.56 mm (0.374 to 0.376 inch)

Outside diameter ... 15.900 to 15.910 mm (0.6260 to 0.6265 inch)

Bore diameter in cylinder head for valve guide ... 15.87 to 15.89 mm (0.625 to 0.626 inch)

Interference fit of valve guide in cylinder head ... 0.03 to 0.07 mm (0.001 to 0.003 inch)

Overall length of valve guide

Inlet ... 57.94 mm (2.281 inch)

Exhaust ... 61.1 mm (2.406 inch)

Projection of valve guide above valve spring recess (3) ... 15.1 mm (0.595 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.

(5) Diameter of the exhaust valve stem ... 9.43 to 9.46 mm (0.371 to 0.372 inch)

Clearance of valve in valve guide ... 0.05 to 0.13 mm (0.002 to 0.005 inch)

Maximum permissible clearance of valve in valve guide ... 0.15 mm (0.006 inch)

Overall length of the exhaust valve ... 123.07 to 123.57 mm (4.845 to 4.865 inch)

(6) Diameter of the inlet valve stem ... 9.460 to 9.490 mm (0.3724 to 0.3735 inch)

Clearance of valve in the valve guide ... 0.02 to 0.10 mm (0.001 to 0.004 inch)

Maximum permissible clearance of valve in valve guide ... 0.13 mm (0.005 inch)

Overall length of the inlet valve ... 122.66 to 123.07 mm (4.829 to 4.845 inch)

(7) Exhaust valve face angle ... 45 degrees

Valve seat angle ... 46 degrees

(8) Diameter of the exhaust valve ... 37.26 to 37.52 mm (1.467 to 1.477 inch)

Valve depth below the cylinder head face

Minimum ... 1.28 mm (0.050 inch)

Maximum ... 1.83 mm (0.072 inch)

Service wear limit ... 2.08 mm (0.082 inch)

(9) Diameter of the inlet valve ... 44.86 to 45.11 mm (1.766 to 1.776 inch)

Valve depth below the cylinder head face

Minimum ... 1.27 mm (0.050 inch)

Maximum ... 1.60 mm (0.063 inch)

Service wear limit ... 1.85 mm (0.073 inch)

(10) Inlet valve face angle ... 45 degrees

Valve seat angle ... 46 degrees

Note: Some engines may have valve face angles of 30 degrees and valve seat angles of 31 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)

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Illustration 2	g00295327
Recess for a valve insert

(11) Machine the recess in the head for valve seat inserts to the following dimensions:

Inlet

(A) ... 7.19 to 7.32 mm (0.283 to 0.288 inch)

(B) ... 51.220 to 51.240 mm (2.0167 to 2.0175 inch)

Exhaust

(A) ... 9.52 to 9.65 mm (0.375 to 0.380 inch)

(B) ... 42.620 to 42.650 mm (1.6779 to 1.6790 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 for removal and installation procedures.

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Illustration 3	g00517019
Angles and dimensions of the valve seat insert (12) Valve seat insert (D) Included angle of the faces (E) Dimension of chamfer (F) Vertical angle of chamfer

(12) Valve seat insert

(D) Included angle of the faces of the valve seat insert

Engines with 46 degree valve seats ... 88 degrees

Engines with 31 degree valve seats ... 118 degrees

(E) Dimension of chamfer for all engines ... 1.10 ± 0.20 mm (0.043 ± 0.008 inch)

(F) Angle of chamfer from the vertical for all engines ... 30 degrees

Type 2 Engines and 7BJ Engines

Note: For a complete description of Type 1 and Type 2 engines, refer to the Specifications Module, "Engine Design" for more information.

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Illustration 4	g00294082
Inlet valves and exhaust valves

(1) Single valve springs

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

Test force ... 246 to 277 N (55 to 62 lb)

(2) Valve spring insert for the valve spring

(3) Valve guides

Inside diameter of finished valve guide ... 9.00 to 9.02 mm (0.354 to 0.355 inch)

Outside diameter of inlet valve ... 13.03 to 13.05 mm (0.513 to 0.514 inch)

Outside diameter of exhaust valve ... 14.03 to 14.05 mm (0.552 to 0.553 inch)

Bore diameter in the cylinder head for the inlet valve guide ... 13.00 to 13.03 mm (0.512 to 0.513 inch)

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

Interference fit of valve guide in the 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 (2.012 inch)

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

(4) Diameter of the exhaust valve stem ... 8.94 to 8.96 mm (0.352 to 0.353 inch)

Clearance of valve in valve guide ... 0.040 to 0.084 mm (0.0026 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 the valve guide ... 0.025 to 0.069 mm (0.001 to 0.003 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) Exhaust valve face angle ... 45 degrees

Valve seat angle ... 46 degrees

Note: Some engines may have valve face angles of 30 degrees and valve seat angles of 31 degrees.

(7) Exhaust valve head diameter ... 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 ... 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) Inlet valve face angle ... 45 degrees

Valve seat angle ... 46 degrees

Note: Some engines may have valve face angles of 30 degrees and valve seat angles of 31 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)

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Illustration 5	g00295327
Recess for a valve insert

(11) 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 (1.7140 to 1.7150 inch)

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

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Illustration 6	g00517019
Angles and dimensions of the valve seat insert (12) Valve seat insert (D) Included angle of the faces (E) Dimension of chamfer (F) Vertical angle of chamfer