C12.9 Marine Engines Caterpillar

Removal Procedure

Start By:

1. Remove auxiliary water pump

2. Remove engine oil filter base

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Illustration 1	g06054802

1. Remove bolts (1) and fumes disposal cover (2).
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   Illustration 2	g06054824

2. Disconnect harness assembly (5) and position out of the way. Remove bolt (4) and remove crankshaft speed sensor (3).
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   Illustration 3	g06054845

3. Remove bolts (6). Remove spacer (7) and timing wheel (8).

   Note: Make index marks on camshaft gear (9), idler gear (12), and the fuel injection pump drive gear to aid in installation.

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   Illustration 4	g06054855

4. Remove bolts (10). Remove sealing plate (11) and camshaft gear (9).
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   Illustration 5	g06054958

5. Remove bolts (13). Remove washer (14) and gear (12).
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   Illustration 6	g06054951

6. Remove screws (15) and remove adapter (16).
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   Illustration 7	g06055056

7. Remove gasket (17) from adapter (16).
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   Illustration 8	g06055069

8. Remove O-ring (18) from adapter (16).

Installation Procedure

1. Install camshaft gear (9) in the reverse order of removal.

   1. Lubricate O-ring (18) with oil being sealed.

   2. Tighten bolts (15) to a torque of 25 ± 3 N·m (221 ± 27 lb in).

   3. Apply clean engine oil to bolts (13). Tighten bolts (13) to a torque of 30 ± 2 N·m (266 ± 18 lb in) then turn an extra 90 degrees ± 5 degrees.

   4. Tighten bolts (10) to a torque of 60 ± 3 N·m (44 ± 2 lb ft) then turn an extra 60 degrees ± 6 degrees.

   5. Align camshaft timing wheel (8). Refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".

   6. Check backlash of camshaft gear (9). Refer to Testing and Adjusting, "Rear Gear Group - Time".

   7. Apply Tooling (A) to bolts (6). Tighten bolts (6) to a preliminary torque of 10 ± 1 N·m (89 ± 9 lb in). Then tighten to a final torque of 29 ± 4 N·m (257 ± 35 lb in).

   8. Tighten bolt (4) to a torque of 10 ± 1 N·m (89 ± 9 lb in).
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      Illustration 9	g06060602

   9. Tighten bolts (1) in the numerical sequence shown in illustration 9 to a torque of 10 ± 1 N·m (89 ± 9 lb in).