CONTROL GP-TRANSMISSION 1219300 - Caterpillar

Crankshaft
START BY:a. remove oil pumpb. remove timing gear coverc. remove flywheel housingd. remove pistons On later engines all counterbalance weights are located inside the block. And earlier engine is shown. For more detail about removal of main bearings, see Remove And Install Crankshaft Main Bearings. 1. Check each bearing cap (1) for its location on the engine. Each cap has an arrow which is toward the front of the block and a number which gives the location of that cap. Keep each bearing with the correct cap.2. Remove bearing caps No. 2 through No. 4. Remove thrust plates from No. 3 upper bearing. 3. Install one of the flywheel bolts in each end of the crankshaft. Fasten a hoist to the crankshaft as shown. Remove No. 1 and No. 5 main bearing caps. Remove the crankshaft. Weight of the crankshaft is 122 kg (270 lb.).
Be careful not to cause damage to the crankshaft journals when the crankshaft is removed.
4. Remove crankshaft gear (2) with tooling (A).5. Remove dowel and pin from crankshaft with tooling (B).Install 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 must be supported. Use a jack under an adjacent crankshaft counterweight, and hold the crankshaft 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 no 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. Measure the width of the Plastigage while it is in the bearing cap or on the crankshaft journal. Do this by using the correct scale on the package. Record the measurements.... Remove the Plastigage before installing the cap.When using Plastigage, the readings can sometimes be unclear. For example, all parts of the Plastigage are not the same width. Measure the major widths to make sure that they are within the specification range. Also, experience has shown that when checking clearances tighter