3512B Marine Auxiliary Engines Caterpillar

Removal Procedure

Start By:

1. Remove the rocker shaft assemblies and the pushrods.

2. Remove the front housing.

3. Remove the balancer gear from the rear gear group.

4. Remove the piston cooling jets.

Note: The weight of the engine is approximately 6123 kg (13,500 lb).

1. Use Tooling (A) to turn the engine to a horizontal position. The engine can be supported with Tooling (A) or with blocks.

   Note: It is not necessary to remove the counterweights from the crankshaft, if the piston and connecting rod assemblies have been removed from the engine.

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   Illustration 1	g00577386

2. Place identification marks on counterweights (1). Remove counterweights (1) from the engine.
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   Illustration 2	g00577387

   Note: Ensure that the journals of the crankshaft are not scratched by the connecting rods.

3. Remove connecting rod bearing caps (2) and push the connecting rods away from the crankshaft.
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   Illustration 3	g00577388

4. Remove the center main bearing cap and two thrust plates (3) from each side of the center main bearing.
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   Illustration 4	g00577389
   Typical example

5. Use two of the bolts from the flywheel and install one bolt in each end of the crankshaft.

   Note: The weight of the crankshaft is approximately 590 kg (1300 lb).

6. Attach a suitable lifting device to the crankshaft (Illustration 4). Remove remaining main bearing caps (5). Remove crankshaft (6) from the engine.

7. Remove the upper halves of the main bearings.

8. Remove the upper halves of the connecting rod bearings.
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   Illustration 5	g00577390

9. If necessary, remove bolts (7) and crankshaft gear (6) from each end of the crankshaft.