C3.4B Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g03736242
Typical example

Lubricate the threads and the underside of the head bolts with clean engine oil.

Tighten the M15 bolts in the sequence that is shown in illustration 1 to the following torque. ... 130 N·m (96 lb ft)

Tighten the M12 bolts in the sequence that is shown in illustration 1 to the following torque. ... 65 N·m (48 lb ft)

Tighten the M15 bolts in the sequence that is shown in illustration 1 to the additional amount. ... 90 degrees

Tighten the M12 bolts in the sequence that is shown in illustration 1 to the additional amount. ... 90 degrees

Tighten the M15 bolts in the sequence that is shown in illustration 1 to the additional amount. ... 70 degrees

Tighten the M12 bolts in the sequence that is shown in illustration 1 to the additional amount. ... 60 degrees

Minimum thickness of cylinder head ... 90 mm (3.54330 inch)

Illustration 2	g03698264
Flatness of the cylinder head (typical example)

Note: The maximum distortion of the bottom face of the cylinder head is given in table 1.

Illustration 3	g02328933
Typical example

(D) Valve guide height from the top of the valve guide to the valve spring seat ... 7.85 to 8.95 mm (0.30905 to 0.35236 inch)

(E) Outside diameter of the valve guides ... 10.028 to 10.039 mm (0.39480 to 0.39524 inch)

(F) Length of the valve guides ... 48.8 to 49.2 mm (1.92126 to 1.93700 inch)

(G) Internal diameter of the valve guides ... 5.2 to 5.4 mm (0.20472 to 0.21260 inch)

(H) Valve depths

Inlet ... 0.3 to 0.7 mm (0.01181 to 0.02756 inch)

The service limit for the depth of the inlet valve ... 0.9 mm (0.03543 inch)

Exhaust ... 0.3 to 0.7 mm (0.01181 to 0.02756 inch)

The service limit for the exhaust valve depth ... 1 mm (0.03937 inch)

Illustration 4	g02474819
Typical example

(J) Diameter of the parent bore in the cylinder head ... 9.974 to 10.011 mm (0.39268 to 0.39413 inch)

(K) Seat angle

Inlet ... 59.5 degrees

Exhaust ... 59.5 degrees

Illustration 5	g02847819
Typical example

(L) Seat surface finish ... Ra 1.6 microns

(M) Concentricity of valve seat to valve guide parent bore Maximum Total Indicated Reading (TIR) ... 0.05 mm (0.00197 inch)