C-15, C-16 and C-18 Truck Engines Caterpillar

Installation Procedure

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Illustration 1	g00618962

1. Install a new gasket (25) on the cylinder block.

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Illustration 2	g00576208

2. Install plate (23) and bolts (24) .

3. Install shaft assembly (20) . Apply Tooling (B) to the studs and the bolt for shaft assembly (20) . Tighten the nuts and the bolt for shaft assembly (20) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).

Note: The backlash for the camshaft gear and the adjustable idler gear should be readjusted if shaft assembly (19) has moved in any way. The camshaft gear must be installed and the adjustable idler gear must be removed in order to perform the backlash adjustment procedure. Refer to Testing and Adjusting, "Gear Group (Front) - Time".

4. Install shaft assembly (19) . Do not tighten the nuts and the bolt for shaft assembly (19) at this time. The nuts and the bolt for shaft assembly (19) will need to be tightened when the backlash is adjusted.

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Illustration 3	g00537659

5. Apply Tooling (B) to bolts (22) . Install shaft (21) . Tighten bolts (22) to a torque of 55 ± 10 N·m (41 ± 7 lb ft) in sequence. (1, 3, 4, 5, 2, 1, 2, 3, 4, 5, 1)

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Illustration 4	g01010048

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Illustration 5	g00516404

6. Position cluster gear (16) on shaft (21) . Ensure that timing marks (V) are aligned on cluster gear and the crankshaft gear. Apply Tooling (B) to bolts (17) . Install plate (18) and bolts (17) . If bolts (17) are 3/8 inch bolts then tighten bolts (17) to a torque of 55 ± 10 N·m (41 ± 7 lb ft). If bolts (17) are 5/16 inch bolts then tighten bolts (17) to a torque of 30 ± 7 N·m (22 ± 5 lb ft).

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Illustration 6	g00576203

7. Position idler gear (11) on shaft (20) . Apply Tooling (B) to bolts (12) . Install plate (13) with the oil groove toward the gear face. Install bolts (12) . If bolts (12) are 3/8 inch bolts then tighten bolts (12) to a torque of 55 ± 10 N·m (41 ± 7 lb ft). If bolts (12) are 5/16 inch bolts then tighten bolts (12) to a torque of 30 ± 7 N·m (22 ± 5 lb ft).

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Illustration 7	g01010047

Note: Skip Step 8 if shaft assembly (19) has been removed, loosened, or moved in any way. The backlash for the camshaft gear and the adjustable idler gear will need to be readjusted. The camshaft gear must be installed and the adjustable idler gear must be removed in order to perform the backlash adjustment procedure. Refer to Testing and Adjusting, "Gear Group (Front) - Time".

8. Position adjustable idler gear (8) on shaft (19) . Apply Tooling (B) to bolts (9) . Install plate (10) and bolts (9) . If bolts (9) are 3/8 inch bolts then tighten bolts (9) to a torque of 55 ± 10 N·m (41 ± 7 lb ft). If bolts (9) are 5/16 inch bolts then tighten bolts (9) to a torque of 30 ± 7 N·m (22 ± 5 lb ft).

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Illustration 8	g00576240

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Illustration 9	g00576839

9. Install O-ring seals (5) and (6) in seal assembly (3) . Lubricate seal (6) with Tooling (C) .

10. Install seal assembly (3) . Position adapter (4) . Ensure that the dowel in adapter (4) engages the hole in the camshaft.

11. Position thrust plate (1) . Apply Tooling (B) to bolts (2) . Hold thrust plate (1) in position and install bolts (2) . Evenly tighten bolts (2) until seal assembly (3) and O-ring seal (5) are seated against the cylinder head.

    Note: Be careful in order to ensure that O-ring seal (5) stays in the groove in seal assembly (3) .

12. Adjust the backlash for the camshaft gear and the adjustable idler gear, if necessary. Refer to Testing and Adjusting, "Gear Group (Front) - Time".

    Note: The camshaft gear must be installed and the adjustable idler gear must be removed in order to perform the backlash adjustment procedure.

End By: Install the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Install".