3512B Marine Auxiliary Engines Caterpillar

Installation Procedure

1. Measure the clearances of the main bearings. See this Disassembly and Assembly, "Bearing Clearance - Check" topic.

2. Coat the main bearings with clean engine oil.
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   NOTICE
   Ensure that the upper halves and the lower halves of the main bearings are installed with the tabs fitting into the notch in the cylinder block and the notch in the main bearing cap.

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   Illustration 1	g00612583

3. Install Tooling (B) in the oil hole of the crankshaft journal. Place the upper half of the main bearing on the crankshaft. Use Tooling (A) to turn the engine and push the upper half of the main bearing into position with Tooling (B).
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   Illustration 2	g00612586

4. Coat thrust plates (5) with clean engine oil. Install thrust plates (5) on each side of the center main bearing.
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   Illustration 3	g00612587

   Note: The main bearing caps must be installed with the word "FRONT" and the part number toward the front of the engine. Each main bearing cap has a number on the bottom surface and each main bearing must be installed in the corresponding position in the cylinder block.

5. Coat lower halves of main bearings (7) with clean engine oil. Install the lower halves of main bearings (7) in main bearing caps (6). Place the bearing caps into position.

6. Coat the threads of the bolts for the main bearing caps and coat the underside of the bolt heads with clean engine oil.
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   Illustration 4	g00612585

7. Install the bolts for the main bearing caps. Tighten the bolts in the numerical sequence that is shown in Illustration 4.

   1. Use Tooling (D) and tighten the bolts to a torque of 190 ± 14 N·m (140 ± 10 lb ft).

   2. Tighten the bolts for an additional 180 ± 5 degrees (1/2 turn).
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   NOTICE
   Each counterweight is numbered and must be installed in the same position as the corresponding number on the crankshaft mounting pad in order to prevent damage to the crankshaft.

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   Illustration 5	g00612590

8. Ensure that the dowels are in the crankshaft assembly. Install counterweights (8).

   Note: Always install new bolts for the counterweights. Never reuse counterweight bolts.

9. Coat the threads, the shanks, and the underside of the bolt heads with Tooling (E).

10. Tighten the bolts to a torque of 70 ± 5 N·m (145 ± 4 lb ft).

11. Tighten the bolts for an additional 120 ± 5 degrees (1/3 turn).
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    Illustration 6	g00612591

12. Use Tooling (C) to measure the end play of the crankshaft. The end play is determined by the thrust plates that are on the center of the main bearing. The maximum end play of the crankshaft is 0.17 to 0.63 mm (0.007 ± 0.025 inch).