3126B Marine Engine Caterpillar

Installation Procedure

1. Thoroughly clean the mating surfaces of the cylinder head and the cylinder block.

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Illustration 1	g00611342

2. Install a new cylinder head gasket (3) .

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Illustration 2	g00611341

Note: To avoid damage to the cylinder head gasket, use guide bolts of an appropriate size to install the cylinder head.

3. Attach a suitable lifting device to the cylinder head. Position the cylinder head assembly onto the dowels in the cylinder block. Lower the cylinder head onto the cylinder block.

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Illustration 3	g00611336

4. Inspect the condition of cylinder head bolts (1) and (2). Replace cylinder head bolts (1) and (2), if necessary.

5. Lubricate cylinder head bolts (1) and (2) with clean engine oil. Install cylinder head bolts (1) and (2). Follow Step 6 for the correct tightening procedure.

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Illustration 4	g00611358

6. Tighten the cylinder head bolts according to the following procedure:

   1. Tighten bolt (1) through bolt (14) in a numerical sequence to a torque of 150 ± 15 N·m (110 ± 11 lb ft).

   2. Tighten bolt (1) through bolt (14) again in a numerical sequence to a torque of 435 ± 20 N·m (320 ± 15 lb ft).

   3. Tighten bolt (1) through bolt (14) again in a numerical sequence to a torque of 435 ± 20 N·m (320 ± 15 lb ft).

   4. Tighten bolt (15) through bolt (20) in a numerical sequence to a torque of 55 ± 7 N·m (41 ± 5 lb ft).

End By:

1. Install the engine oil filter base. Refer to Disassembly and Assembly, "Engine Oil Filter Base - Install".
2. Install the exhaust manifold. Refer to Disassembly and Assembly, "Exhaust Manifold - Remove and Install".
3. Install the unit injectors. Refer to Disassembly and Assembly, "Unit Injector - Install".
4. Install the aftercooler. Refer to Disassembly and Assembly, "Aftercooler - Install".