C-12 Marine Engines Caterpillar

Cylinder Head - Install

Usage:

C-12 9HP

Installation Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	2P-8250	Strap Wrench Assembly	1
B	1U-5686 ⁽¹⁾	21/32 inch Drill Bit	1
C	4C-9732 ⁽¹⁾	M16x2.0-D7 Plug Tap	1
D	9U-5604	M16x2.0 32mm Heli-Coil Insert ⁽²⁾	1
E	8T-2799 ⁽¹⁾	Heli-Coil Installation Tool	1
F	8T-3096	Plug Tap	1

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^( 1 )	Part of 4C-8367 Thread Repair Kit
^( 2 )	This is a special length.

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NOTICE

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

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

Clean all 26 head bolt holes on the cylinder block with a 8T-3096 plug tap .

After cleaning the threads, remove any debris from the head bolt holes on the cylinder block with a vacuum line.

Visually inspect the head bolt holes on the cylinder block for thread damage.

If a damaged head bolt thread is observed, repair the damaged head bolt thread with a Heli-Coil thread repair kit.

Inspect the cylinder head and the cylinder block for flatness. Refer to Guideline for Reusable Parts and Salvage Operations, SEBF8162, "Procedure to Measure and Salvage Cylinder Head Assemblies and Related Components".

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Illustration 1	g00810396
Cylinder Head Gasket (29) Straight Edge

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Illustration 2	g00810399
Cylinder Head Gasket (28) Scalloped Edge

Determine the correct cylinder head gasket to use. Refer to Illustration 1 and Illustration 2.

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Illustration 3	g00525775

Install the correct cylinder head gasket (26) and new O-ring seals (27) on the cylinder block. Inspect the condition of the remaining gaskets. Replace the gaskets, if necessary.

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

Use a suitable lifting device to install the cylinder head on the cylinder block.

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Illustration 4	g00525534

Install four gaskets (24) on cylinder head (25) .

Install new cylinder head bolts (23). If the engine is equipped with a compression brake, then also install new head bolt studs.

Lubricate the following components with 6V-4876 Lubricant : the bolt threads, the underside of the bolt heads and the washers. Follow Step 13 for the correct tightening procedure.

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Illustration 5	g00517501

Note: Engines that are equipped with a compression brake will have three head bolt studs. Install the head bolt studs in positions (2), (8), and (10). Tighten the head bolt studs in sequence with the cylinder head bolts.

Tighten the cylinder head bolts according to the following procedure:
1. Tighten bolt (1) through bolt (26) in a numerical sequence to a torque of 160 ± 15 N·m (120 ± 11 lb ft).
1. Tighten bolt (1) through bolt (26) again in a numerical sequence to a torque of 160 ± 15 N·m (120 ± 11 lb ft).
1. Place an index mark on each bolt head. Turn bolt (1) through bolt (26) in a numerical sequence for an additional 90 degrees (1/4 turn).
1. Loosen bolt (1) through bolt (26) until the washers are loose under the bolt heads.
1. Tighten bolt (1) through bolt (26) in a numerical sequence to a torque of 160 ± 15 N·m (120 ± 11 lb ft).
1. Tighten bolt (1) through bolt (26) again in a numerical sequence to a torque of 160 ± 15 N·m (120 ± 11 lb ft).
1. Place an index mark on each bolt head. Turn bolt (1) through bolt (26) in a numerical sequence for an additional 90 degrees (1/4 turn).
1. Tighten bolt (27) through bolt (33) in a numerical sequence to a torque of 28 ± 7 N·m (20 ± 5 lb ft).

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Illustration 6	g00525468

Install head bolt spacers (22) on the three head bolt studs. Tighten head bolt spacers (22) to a torque of 100 ± 20 N·m (75 ± 15 lb ft).

Install water outlet manifold (21) and bolts (20) .

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Illustration 7	g00707634

Hold line (19) in position and connect fittings (17). Install bolts (18) .

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Illustration 8	g00524775

Connect wiring harness (16). Tighten bolt (15) to a torque of 6 ± 1 N·m (53 ± 9 lb in).

Install the clip, the washer, and nut (14) .

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Illustration 9	g00524537

Connect sensor connector (12). Install the clip, the washer, and bolt (11). Secure the wiring harness with tie straps (13) .

Install fuel filter (10) with Tool (A). Follow the instructions on the fuel filter.

Connect hose (9) .

Install hose (8) .

Install the bolts, the washers, and two nuts (7) .

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Illustration 10	g00524436

Route wiring harness (1) accordingly and connect sensor connector (2) .

Fill the cooling system with coolant to the correct level. Refer to the Operation and Maintenance Manual for the correct filling procedure.

End By:

Install the electronic unit injectors. Disassembly and Assembly, "Electronic Unit Injector - Install".
Install the valve cover base. Refer to Disassembly and Assembly, "Valve Mechanism Cover Base - Remove and Install".
Install the inlet manifold. Disassembly and Assembly, "Inlet Manifold - Install".
Install the exhaust manifold. Disassembly and Assembly, "Exhaust Manifold - Remove and Install".