SPIDER AS-FAN 2096222 - Caterpillar

START BY: a. remove timing gear coverb. remove flywheel housingc. remove pistons and connecting rods 1. Turn the crankshaft until the "C" mark on the crankshaft drive gear is in alignment with the "C" mark on the camshaft drive gear as shown. 2. Remove the three center main bearing caps (1). 3. Remove thrust bearings (2) from each side of the center crankshaft journal. 4. Remove bolt (3). Remove the oil pickup tube support strip and the clip from the cylinder block as a unit.5. Install one of the flywheel bolts in the end of the crankshaft.6. Fasten a nylon strap and a hoist on crankshaft (4) as shown.7. Remove the two end caps.
Be careful not to damage the crankshaft journals when the crankshaft is removed.
8. Remove crankshaft (4) from the cylinder block. The weight of the crankshaft is 52 kg (115 lb.).
If new main bearings are not to be installed during crankshaft installation, put identification marks on the original bearings as to their location in the engine.
9. Remove the crankshaft main bearings from the cylinder block and from the main bearing cap.10. Check the condition of the main bearings and crankshaft. Make reference to Guideline For Reusable Parts: Main And Connecting Rod Bearings, Form No. SEBF8009 and Visual Inspection Of Crankshafts, Form No. SEBF8043. 11. Use tooling (A), and remove the drive gear from the crankshaft.Install Crankshaft And Gear
1. Heat the crankshaft drive gear to a maximum temperature of 315° (600°F). Install drive gear (1) on the crankshaft with the "C" mark on the gear toward the pulley end of the crankshaft. If the crankshaft journals and bores for the block and rods were measured at disassembly and found to be within specifications, no further checks are necessary. However, if the serviceman still wants to measure the bearing clearances, Plastigage is recommended. Lead wire, shim stock or use of a dial bore gauge can damage the bearing surface.The serviceman must be very careful to use Plastigage correctly. The following points must be remembered:...Make sure that the backs of the bearings and the bores are clean and dry....Make sure that the bearing locking tabs are properly seated in their slots....The crankshaft must be free of oil where the Plastigage touches it....If the main bearing clearances are checked with the engine upright or on its side, the crankshaft will have to be lifted up with a force equal to the weight of the crankshaft and held against the crown of the bearing. If the crankshaft is not supported, the weight of the crankshaft will cause incorrect readings....Put a piece of Plastigage on the crown of the bearing half that is in the cap. Do not allow the Plastigage to extend over the edge of the bearing....Install the bearing cap using the correct torque-turn specifications. Do not use an impact wrench. Be careful not to dislodge the bearing when the cap is installed....Do not turn the crankshaft with the Plastigage installed....Carefully remove the cap, but do not remove the Plastigage.