C6.6 Engines for Caterpillar Built Machines Camshaft Gear - Remove and Install Caterpillar

Removal Procedure

Start By:

1. Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

2. Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove and Install".

Note: Either Tooling (A) can be used. Use the Tooling that is most suitable.

1. Use Tooling (A) in order to rotate the crankshaft so that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Centre Position for No.1 Piston".
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   Illustration 1	g01340534

2. Install Tooling (B) through hole (X) in camshaft gear (1) into the front housing. Use Tooling (B) in order to lock the camshaft in the correct position.
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   Illustration 2	g01335380

3. Remove plug (4) from the cylinder block. Install Tooling (C) into hole (Y) in the cylinder block. Use Tooling (C) in order to lock the crankshaft in the correct position.

   Note: Do not use excessive force to install Tooling (C). Do not use Tooling (C) to hold the crankshaft during repairs.

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   Illustration 3	g01340536

4. Loosen nuts (6) on all rocker arms (7). Unscrew adjusters (5) on all rocker arms (7) until all valves are fully closed.

   Note: Failure to ensure that all adjusters are fully unscrewed can result in contact between the valves and pistons.

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   Illustration 4	g01340551
   Alignment of timing marks

5. Mark gears (1) and (8) in order to show alignment. Refer to Illustration 4.

   Note: Identification will ensure that the gears can be installed in the original alignment.

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   Illustration 5	g01340554

6. Remove Tooling (B). Remove bolt (3) and washer (2) from camshaft gear (1).

7. Remove camshaft gear (1) from the camshaft.

   Note: If the camshaft gear is a tight fit on the nose of the camshaft, use a prybar in order to remove the camshaft gear.

8. If necessary, remove the key from the nose of the camshaft.

Installation Procedure

1. Ensure that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Center for No. 1 Piston".
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   Illustration 6	g01335380

2. Ensure that Tooling (C) is installed in hole (Y) in the cylinder block. Use Tooling (C) in order to lock the crankshaft in the correct position. Refer to System Operation, Testing and Adjusting, "Finding Top Centre Position for No.1 Piston".

3. Ensure that the camshaft gear and the key are clean and free from wear or damage.

4. If necessary, install the key into the nose of the camshaft.

   Note: Ensure that the key is squarely seated.

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   Illustration 7	g01340534

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   Illustration 8	g01340551
   Alignment of timing marks

5. Align the keyway in camshaft gear (1) with the key in the camshaft. Install camshaft gear onto the camshaft. Ensure that the timing marks on gears (1) and (8) are in alignment and that the mesh of the gears is correct. Refer to Illustration 8.
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   Illustration 9	g01340554

6. Install Tooling (B) through hole (X) in the camshaft gear into the front housing. Install washer (2) and bolt (3) to camshaft gear (1).

7. Remove Tooling (B) and (C). Install plug (4) into hole (Y) in the cylinder block. Refer to Illustration 6.

8. Tighten bolt (3) to a torque of 95 N·m (70 lb ft).
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   Illustration 10	g01335426

9. Ensure that the backlash for gears (1) and (8) is within specified values. Refer to Specifications, "Gear Group (Front)" for further information.

10. Ensure that the end play for camshaft gear (1) is within specified values. Refer to Specifications, "Camshaft" for further information.

11. Lubricate the teeth of the gears with clean engine oil.

12. Adjust the valve lash. Refer to System Operation, Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust".

End By:

1. Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove and Install".

2. Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".