3512B Marine Auxiliary Engines Caterpillar

Exhaust Manifold - Remove and Install

Usage:

3512 4DR

Removal Procedure

Start By:

Remove the aftercooler. Refer to Disassembly and Assembly, "Aftercooler - Remove and Install".
Remove the air inlet manifold. Refer to Disassembly and Assembly, "Air Inlet Manifold - Remove and Install".

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NOTICE

Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Note: It is possible to remove the exhaust manifolds without removing the air inlet manifold first. However, the procedure is more difficult. The aftercooler must be removed before the exhaust manifolds are removed.

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Illustration 1	g00616579

Remove bolts (1) from heat shield (2).
Remove heat shield (2).
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Illustration 2 g00616580
Remove nuts (3) that attach the exhaust manifold to the elbow for the turbocharger. Remove the gasket also.
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Illustration 3 g00616613
Remove bolts (4), the nuts, and the washers that attach the exhaust manifold to the cylinder head. Remove gasket (5).
Note: The weight of the exhaust manifold is approximately 106 kg (234 lb).
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Illustration 4 g00616615
Use a suitable lifting device to remove exhaust manifold (6).

Installation Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	5P-3931	Anti-Seize Compound	1

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NOTICE

Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

Note: The weight of the exhaust manifold is approximately 106 kg (234 lb).

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Illustration 5	g00616615

Use a suitable lifting device to lift exhaust manifold (6) onto the engine.
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Illustration 6 g00616613
Install new gaskets (5). Put Tooling (A) on the threads of the bolts and the washers that hold exhaust manifolds to the cylinder head. Install bolts (4), the nuts, and the washers. Tighten diagonal bolts simultaneously. Tighten the bolts to a torque of 55 ± 5 N·m (40 ± 4 lb ft).
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Illustration 7 g00616580
Install a new gasket for the joint between the exhaust manifold and the elbow for the turbocharger. Put Tooling (A) on the threads of the bolts and the washer faces. Tighten the nuts to a torque of 55 ± 5 N·m (40 ± 4 lb ft).
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Illustration 8 g00616579
Install heat shield (2).
Install bolts (1) and the washers for heat shield (2).

End By:

Install the aftercooler. Refer to Disassembly and Assembly, "Aftercooler - Remove and Install".
Remove the air inlet manifold. Refer to Disassembly and Assembly, "Air Inlet Manifold - Remove and Install".