3044C Industrial Engine and Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g01010358

(1) Valve spring

Free length of the valve springs ... 48.85 mm (1.92 inch)

Service limit for free length of the valve springs ... 47.60 mm (1.87 inch)

Length of the valve springs under set force ... 43 mm (1.69 inch)

Set force of the valve springs ... 176 to 196 N (40 to 44 lb)

Service limit for set force of the valve springs ... 147 N (33 lb)

(2) Valve spring recess

(3) Valve guides

Projection of the valve guide above the valve spring recess ... 14 ± 0.1 mm (0.55 ± 0.004 inch)

(4) Exhaust valve

Diameter of the exhaust valve stem ... 7.920 to 7.940 mm (0.3118 to 0.3126 inch)

Service limit diameter of the exhaust valve stem ... 7.850 mm (0.3091 inch)

Clearance of the exhaust valve stem in the exhaust valve guide ... 0.080 to 0.115 mm (0.0031 to 0.0045 inch)

Maximum allowable clearance of the exhaust valve stem in the exhaust valve guide ... 0.200 mm (0.0079 inch)

Valve depth of the exhaust valve below the cylinder head face

Standard at assembly ... 0.4 to 0.6 mm (0.016 to 0.024 inch)

Service limit ... 1.0 mm (0.039 inch)

(5) Inlet valve

Diameter of the inlet valve stem ... 7.940 to 7.955 mm (0.3126 to 0.3132 inch)

Service limit diameter of the inlet valve stem ... 7.900 mm (0.3110 inch)

Clearance of the inlet valve stem in the inlet valve guide ... 0.065 to 0.095 mm (0.0026 to 0.0037 inch)

Maximum allowable clearance of the inlet valve stem in the inlet valve guide ... 0.150 mm (0.0059 inch)

Valve depth of the inlet valve below the cylinder head face

Standard at assembly ... 0.3 to 0.5 mm (0.012 to 0.020 inch)

Service limit ... 1.0 mm (0.039 inch)

(6) Angle of the exhaust valve face from the horizontal axis

Valve face angle ... 30 degrees

Valve seat angle ... 30 degrees

(7) Angle of the inlet valve face from the horizontal axis

Valve face angle ... 30 degrees

Valve seat angle ... 30 degrees

Illustration 2	g00985069
Bore in the cylinder head for the valve seats

Bore for the inlet valve seat

A ... 45 degrees

B ... 46 to 46.0025 mm (1.8110 to 1.8111 inch)

C ... 2 ± 0.1 mm (0.079 ± 0.004 inch)

D ... 8 ± 0.1 mm (0.315 ± 0.004 inch)

Bore for the exhaust valve seat

A ... 45 degrees

B ... 37 to 37.0025 mm (1.457 to 1.458 inch)

C ... 2 ± 0.1 mm (0.079 ± 0.004 inch)

D ... 8 ± 0.1 mm (0.315 ± 0.004 inch)