G3408 and G3412 Engines Caterpillar

Illustration 1	g00941446

(1) Large bolts (3/4 inch)

(2) Small bolts (3/8 inch)

Use the following procedure to tighten the cylinder head bolts:

1. Apply engine oil to all bolt threads.

2. Tighten bolts 1 through 20 according to the numerical sequence.

   Torque ... 270 ± 27 N·m (200 ± 20 lb ft)

3. Tighten bolts 1 through 20 according to the numerical sequence.

   Torque ... 450 ± 20 N·m (330 ± 15 lb ft)

4. Tighten bolts 1 through 20 according to the numerical sequence.

   Torque ... 450 ± 20 N·m (330 ± 15 lb ft)

5. Install the rocker arm group.

6. Tighten bolts 21 through 26 according to the numerical sequence.

   Torque ... 270 ± 27 N·m (200 ± 20 lb ft)

7. Tighten bolts 21 through 26 according to the numerical sequence.

   Torque ... 450 ± 20 N·m (330 ± 15 lb ft)

8. Tighten bolts 21 through 26 according to the numerical sequence.

   Torque ... 450 ± 20 N·m (330 ± 15 lb ft)

9. Tighten the 3/8 inch bolts (2) .

   Torque ... 43 ± 7 N·m (32 ± 5 lb ft)

Illustration 2	g01411761

(A) Dimension

New cylinder head thickness ... 112.78 ± 0.25 mm (4.440 ± 0.010 inch)