3412C Engine Caterpillar

Installation Procedure

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Illustration 1	g00515189

1. Install pin (1) in the crankshaft. The length of the pin out of the crankshaft face is 8.4 mm (0.33 inch).

2. Install dowel (2) in the crankshaft. The length of the dowel out of the crankshaft surface is 4.1 ± 0.5 mm (0.16 ± 0.02 inch).

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Illustration 2	g00568027

3. Heat crankshaft gear (3) to a maximum temperature of 205 °C (400 °F). Install gear (3) on the crankshaft with the keyway in alignment with dowel (2). The timing mark "V" is toward the outside of the crankshaft. The notch in the gear must be in alignment with the dowel in the crankshaft.

4. Clean the cylinder block and the main bearing caps thoroughly.

Note: Install the main bearings dry when clearance checks are made. Put clean engine oil on the main bearing for final assembly.

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Illustration 3	g00568037

5. Install the upper half of main bearing (5) in the cylinder block. Ensure that the main bearings are installed so that bearing tabs fit into the notch in the cylinder block and in the main bearing caps. Install the upper half of connecting rod bearing (4) in the connecting rod.

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Illustration 4	g00568051

6. Install Tool (A) on each end of the crankshaft with a front pulley bolt.

7. Fasten a hoist to the crankshaft (6). Install the crankshaft in the cylinder block.

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Illustration 5	g00568153

8. Be sure that the "V" timing marks are aligned on idler gear (8) and crankshaft gear (7) .

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Illustration 6	g00568504

Note: Install the thrust plates with the identification "Block Side" toward the cylinder block.

9. Put clean engine oil on thrust plates (9). Install thrust plates (9) next to the center main bearings.

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Illustration 7	g00568512

10. Install the lower half of the main bearing (10) in the main bearing cap (11) .

Note: Refer to Special Publication, SEBD0531, "Engine Bearings and Crankshafts" for complete details concerning measuring of bearing clearances.

11. Check the bearing clearances with Tool (B). Put Tool (B) on the bearing surfaces.

Note: Ensure that the numbers on the main bearing caps match the numbers on the cylinder block. The arrows on the main bearing caps are toward the front of the cylinder block.

12. Install the main bearing caps. Put 4C-5593 Anti-Seize Compound on the bolts. Install the bolts in the main bearing caps. Tighten the bolt on the tab end of the main bearing cap. Next, tighten the other main bearing cap bolt. Tighten all bolts to a torque of 258 ± 14 N·m (190 ± 10 lb ft).

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Illustration 8	g00285128

13. Put a mark on each bolt and each main bearing cap. Tighten the bolt opposite the tab end of the main bearing cap 120 ± 5 degrees further. Next, tighten the bolt on the tab end of the main bearing cap 120 ± 5 degrees further.

14. Remove the main bearing caps. Measure the thickness of Tool (B). Remove Tool (B) from the main bearing caps. This measurement is the main bearing clearance. The bearing clearance must be 0.091 to 0.186 mm (0.0036 to 0.0073 inch) with new main bearings. Maximum clearance with used main bearings is 0.25 mm (0.010 inch).

15. Put clean engine oil on the bolts and threads. Install the bolts in the main bearing caps. Tighten the bolt on the tab end of the main bearing cap. Next, tighten the other main bearing cap bolt. Tighten all nuts to a torque of 258 ± 14 N·m (190 ± 10 lb ft). Put a mark on each bolt and each main bearing cap. Tighten the bolt opposite the tab end of the main bearing cap 120 ± 5 degrees further. Next, tighten the bolt on the tab end of the main bearing cap 120 ± 5 degrees further.

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Illustration 9	g00568677

16. Install the lower half of connecting rod bearing (12) in connecting rod bearing cap (13). Put 4C-5593 Anti-Seize Compound on the connecting rod bolt threads. Install the connecting rod bearing cap on the connecting rod. The number on the side of the connecting rod bearing cap is on the same side as the number on the connecting rod. Tighten nut (14) on the connecting rod bearing cap (13) to a torque of 82 ± 8 N·m (60 ± 6 lb ft).

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Illustration 10	g00368755

17. Put a mark on each nut and on each connecting rod bearing cap (13). Tighten each nut for an additional 120 ± 5 degrees.

18. Remove connecting rod bearing cap (13). Measure the thickness of Tool (B). Remove Tool (B) from the connecting rod bearings. This measurement is the connecting rod bearing clearance. The connecting rod bearing clearance must be 0.071 to 0.168 mm (0.0028 to 0.0066 inch) with new connecting rod bearings. Maximum clearance with used connecting rod bearings is 0.25 mm (0.010 inch).

19. Put 4C-5593 Anti-Seize Compound on the connecting rod bolt threads. Install the connecting rod bearing cap on the connecting rod. The number on the side of the connecting rod bearing cap is on the same side as the number on the connecting rod. Tighten nut (14) on the connecting bearing cap (13) to a torque of 82 ± 8 N·m (60 ± 6 lb ft). Put a mark on each nut and on each connecting rod bearing cap (2). Tighten each of the nuts for an additional 120 ± 5 degrees.

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Illustration 11	g00504380

20. Check the end play of the crankshaft with Tool (C). Ensure that Tool (C) is against a machined surface. The end play is controlled by the thrust plates of No. 4 main bearing (center). The end play with new thrust plates must be 0.13 to 0.55 mm (0.005 to 0.020 inch). The maximum permissible end play with used thrust plates is 0.89 mm (0.035 inch).

End By:

1. Install the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing - Install".
2. Install the front housing. Refer to Disassembly and Assembly, "Front Housing - Install".
3. Install the crankshaft rear seal. Refer to Disassembly and Assembly, "Crankshaft Rear Seal - Install".
4. Install the crankshaft front seal. Refer to Disassembly and Assembly, "Crankshaft Front Seal - Install".