CAP AS. 1851902 - Caterpillar

Start By:
Remove the rocker shaft assemblies and the pushrods. Refer to Disassembly and Assembly, "Rocker Shaft and Push Rods - Remove".
Remove the speed/timing sensor. Refer to the Service Manual, "Electronic Troubleshooting" module.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00914320
Remove tube assemblies (1) and access covers (2) from both sides of the engine.
Illustration 2 g00914348
Remove two covers (4) from both sides of the front housing.
Illustration 3 g00928893
Push valve lifters (5) away from the camshaft. Hold the valve lifters in position with O-ring seals.
Illustration 4 g00914380
Remove cover (6) for the camshaft drive gears from the flywheel housing.
Illustration 5 g00914382
Remove the bolt and plate (7) that fastens camshaft drive gear (8) to the camshaft.
Illustration 6 g00930876
Place the three washers from Tooling (A) behind plate (7) and install the bolt.
Do not apply more than 51675 kPa (7500 psi) pressure to the hydraulic puller. The adapters are rated at 6 1/2 tons each and the hydraulic puller is rated at 17 tons at 68900 kPa (10000 psi). If too much pressure is applied, the gear may be damaged.
Install Tooling (A) on camshaft drive gear (8). Apply 51675 kPa (7500 psi) to the puller. Strike the screw on the puller with a hammer until camshaft drive gear (8) is free from the camshaft. Remove Tooling (A) and camshaft drive gear (8).
Illustration 7 g00613686
Remove bolts (9) and thrust washers (10) that fasten the camshaft to the engine block.
Perform Steps 4 through 8 for the camshaft on the other side of the engine.
Illustration 8 g00914454
Remove timing ring (11) from the camshaft.
Illustration 9 g00930877
Install Tooling (B) on each end of the camshaft. Note: Tooling (C) can be installed on the flywheel housing in order to remove the camshaft from the rear. Tooling (C) can also be installed on the front housing in order to remove the camshaft from the front of the engine.
Install Tooling (C) on the flywheel housing.
Install Tooling (D) on the end of Tooling (B).
Rotate the camshaft with Tooling (D). Pull the camshaft out of the engine until a suitable lifting device can be attached. Remove front camshaft (12) and rear camshaft (13) as a unit. The weight of the camshaft is approximately 72 kg (158 lb).
Illustration 10 g00579149
Remove bolts (14). Separate the camshafts and remove spacer (15).
Remove the dowel from the front of the camshaft, if necessary.
Repeat Steps 10 through 16 for the other camshaft.