3126E Truck Engine Caterpillar

Illustration 1	g00892051

(1) Large bolts

(2) Small bolts

(3) Cylinder Head

Use the following procedure to install the cylinder head bolts (1) and (2) :

1. Use 6V-4876 Lubricant to lubricate the threaded portion of the bolts and both sides of each washer prior to assembly.

2. Tighten the large bolts (1). Refer to the torque sequence that is shown in Illustration 1.

   Tighten the large bolts to the following torque. ... 300 ± 15 N·m (221 ± 11 lb ft)

3. Loosen all of the previously tightened large bolts (1) to 0 N·m (0 lb ft).

4. Tighten the large bolts (1). Refer to the torque sequence that is shown in Illustration 1.

   Tighten the large bolts to the following torque. ... 130 ± 15 N·m (96 ± 11 lb ft)

5. Tighten the large bolts (1) again. Use the same torque sequence and the same torque setting.

   Tighten the large bolts to the following torque. ... 130 ± 15 N·m (96 ± 11 lb ft)

6. Place an index mark on all of the large bolts (1). Tighten each of the large bolts for an additional 1/4 turn. Refer to the torque sequence that is shown in Illustration 1.

   Tighten the large bolts in a clockwise direction. ... 90 degrees (1/4 turn)

7. Tighten the small bolts (2) to the specified torque. Refer to the torque sequence that is shown in Illustration 1.

   Tighten the small bolts to the following torque. ... 55 ± 7 N·m (41 ± 5 lb ft)

Illustration 2	g00892044
Front and rear views of the cylinder head

(3) Height (B) of new cylinder head ... 158 ± 0.15 mm (6.220 ± 0.006 inch)

Illustration 3	g00892117
View A-A

(4) The installation depth (C) of the cup plug is measured from the face of the cylinder head to the top edge of the plug. Depth of installation ... 1.25 ± 0.25 mm (0.049 ± 0.010 inch)

(5) Apply 9S-3263 Thread Lock Compound to the first three threads of the plugs. Tighten the plugs to the following torque. ... 184 ± 18 N·m (136 ± 13 lb ft)

Illustration 4	g00616924
Cross section view of the cylinder head The view is rotated 15.5 degrees in a counterclockwise direction.

(6) Apply 9S-3263 Thread Lock Compound to the cylinder head at location (A).

Illustration 5	g00703447
Location of the socket setscrew (oil supply orifice)

(7) Tighten the socket setscrew (oil supply orifice) to a torque of 47 ± 9 N·m (35 ± 7 lb ft). If you are installing a new socket setscrew (oil supply orifice), sealing compound has already been applied to the new part.

The new 154-8025 Socket Setscrew and the former 142-7290 Socket Setscrew (oil supply orifice) may be reused. If you are installing a used socket setscrew (oil supply orifice), apply 154-9731 Thread Lock Compound to the threads of the socket setscrew (oil supply orifice) prior to installation. Tighten the socket setscrew (oil supply orifice) to a torque of 47 ± 9 N·m (35 ± 7 lb ft).