G3408C and G3412C Engines Caterpillar

Illustration 1	g01392039

Note: Use clean engine oil to lubricate the threads of the cylinder head bolts before assembly.

Use the following procedure to tighten the cylinder head bolts:

1. Torque for bolt (1) through bolt (14) in a numerical sequence to 270 ± 27 N·m (200 ± 20 lb ft)

2. Again torque the bolt (1) through bolt (14) in a numerical sequence to 390 ± 10 N·m (290 ± 7 lb ft).

3. Finally torque the bolt (1) through bolt (14) in a numerical sequence to 390 ± 10 N·m (290 ± 7 lb ft).

4. Install the rocker arm assemblies onto the cylinder head.

5. Torque the bolt (15) through bolt (18) in a numerical sequence to 270 ± 27 N·m (200 ± 20 lb ft).

6. Again torque the bolt (15) through bolt (18) in a numerical sequence to 390 ± 10 N·m (290 ± 7 lb ft).

7. Finally torque the bolt (15) through bolt (18) in a numerical sequence to 390 ± 10 N·m (290 ± 7 lb ft).

Note: Tighten the bolt (19) through bolt (27) only after the cylinder head bolts have been given final torque.

8. Torque for the bolt (19) through bolt (27) at any tightening sequence to 43 ± 7 N·m (32 ± 5 lb ft)

(28) Torque for taperlock studs into each cylinder head ... 35 ± 5 N·m (26 ± 4 lb ft)

Illustration 2	g01017447

(A) Height of new cylinder head ... 125.00 ± 0.25 mm (4.921 ± 0.010 inch)

Illustration 3	g01404145

Note: Use 6V-6640 Sealant on the cup plugs.

(E) The cup plugs are installed into the cylinder head at the following depth. ... 4.5 ± 0.5 mm (0.18 ± 0.02 inch)

(F) The cup plugs are installed into the cylinder head at the following depth. ... 2.0 ± 0.5 mm (0.08 ± 0.02 inch)

(G) The cup plugs are installed into the cylinder head at the following depth. ... 0.8 ± 0.5 mm (0.03 ± 0.02 inch)

Illustration 4	g01404149

Note: Lubricate the bore of the O-ring seal (30) lightly with the silicone compound prior to installation of the adapter.

Note: Apply 4C-5599 Anti-Seize Compound onto the threads of the adapter prior to installation.

(29) Torque for adapter ... 95 ± 7 N·m (70 ± 5 lb ft)

Illustration 5	g01417555

Note: Use 6V-6640 Sealant on the cup plugs.

(H) Install the cup plugs in the rear side of each cylinder head to the following distance. ... 4.3 ± 0.8 mm (0.17 ± 0.03 inch)

Note: Install cup plugs in front side of each cylinder head after the cylinder head is installed on the cylinder block.

(J) Install the cup plugs in the front side of each cylinder head to the following distance. ... 2.5 ± 0.8 mm (0.10 ± 0.03 inch)