3512B Marine Auxiliary Engines Caterpillar

Removal Procedure

Start By:

1. Remove the rocker shaft assemblies and the pushrods.

2. Remove the speed/timing sensor.

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Illustration 1	g00613617

1. Remove tube assemblies (1) and access covers (2) from both sides of the engine.
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   Illustration 2	g00613619

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   Illustration 3	g00613620

2. Remove the electronic control module (3). See Disassembly and Assembly, "Electronic Control Module (Engine) - Remove and Install".

3. Remove covers (4) from both sides of the front housing.
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   Illustration 4	g00613660

4. Push valve lifters (5) away from the camshaft. Hold the valve lifters in position with O-ring seals.
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   Illustration 5	g00579522

5. Remove cover (6) for the camshaft drive gears from the flywheel housing.
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   Illustration 6	g00579141

6. Remove the bolt and plate (7) that fastens camshaft drive gear (8) to the camshaft.
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   Illustration 7	g00579142

7. Place the three washers from Tooling (B) behind plate (7) and install the bolt.
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   NOTICE
   Do not apply more than 51675 kPa (7500 psi) pressure to the hydraulic puller. The adapters are rated at 6 1/2 tons each and the hydraulic puller is rated at 17 tons at 68900 kPa (10000 psi). If too much pressure is applied, the gear may be damaged.

8. Install Tooling (B) on camshaft drive gear (8). Apply 51675 kPa (7500 psi) to the puller. Strike the screw on the puller with a hammer until camshaft drive gear (8) is free from the camshaft. Remove Tooling (B) and camshaft drive gear (8).
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   Illustration 8	g00613686

9. Remove bolts (9) and thrust washers (10) that fasten the camshaft to the engine block.

10. Perform Steps 5 through 9 for the camshaft on the other side of the engine.
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    Illustration 9	g00579145

11. Remove timing ring (11) from the camshaft.
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    Illustration 10	g00579148

12. Install Tooling (C) on each end of the camshaft.

    Note: Tooling (D) can be installed on the flywheel housing in order to remove the camshaft from the rear. Tooling (D) can also be installed on the front housing in order to remove the camshaft from the front of the engine.

13. Install Tooling (D) on the flywheel housing.

14. Install Tooling (E) on the end of Tooling (C).

15. Rotate the camshaft with Tooling (E). Pull the camshaft out of the engine until a suitable lifting device can be attached. The weight of the camshaft is approximately 148 kg (326 lb). Remove front camshaft (12) and rear camshaft (13) as a unit.
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    Illustration 11	g00579149

16. Remove bolts (14). Separate the camshafts and remove spacer (15).

17. Remove the dowel from the front of the camshaft, if necessary.

18. Repeat Steps 11 through 17 for the second camshaft.