REMOVE AND INSTALL CRANKSHAFT MAIN BEARINGS

TM-5-3805-258-24-2 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Sectionalized and Nonsectionalized Manual
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ENGINE CRANKSHAFT MAIN TM 5-3805-258-24-2 DISASSEMBLY AND ASSEMBLY BEARINGS REMOVE AND INSTALL CRANKSHAFT MAIN BEARINGS 1219-10 Tools Needed A B C 2P5518 Main Bearing Removal Tool 1 Plastigage * 8S2328 Dial Test Indicator Group 1 1. 2. start by: a) remove oil pump b) remove oil pan plate Remove the No. 1, 3 and 5 main bearing caps (1). Remove the crankshaft thrust bearing from the No. 5 main bearing. Remove the lower half of the main bearing from the main bearing caps. CAUTION If the crankshaft is turned in the wrong direc- tion, the tab on bearing will be pushed between the crankshaft and bearing area in block which can cause damage to the block or crankshaft. 3. Install tool (A) in the oil hole in the crankshaft journal and remove the upper half of the main bearing as the crankshaft is turned and the main bearing is moved out of the cylinder block. NOTE: Install the main bearings dry when the clear- ance checks are made. Put clean engine oil on the main bearings for final assembly. CAUTION Make sure the upper and lower halves of the main bearings are installed so the bearing tabs fit into the notch in cylinder block and the main bearing caps. 4. Install new lower half of main bearings (2) in the main bearing caps. Use tool (A) and install the upper half of the main bearings in the cylinder block. 5. Put clean oil on the thrust bearing and install a new thrust bearing for the No. 5 main bearing. Install the thrust bearing with the identifica- tion “BLOCK SIDE” toward the cylinder block and the tabs on the thrust bearings in the machined area in the cylinder block. The tabs will not let the thrust bearing be installed back- ward. NOTE: When the bearing clearance is checked and the engine is in a vertical position, such as in the vehicle, the crankshaft will have to be lifted up and held against the upper halves of the main bearings to get a correct measurement with the Plastigage. The Plastigage will not hold the weight of the crankshaft and give a correct indication. If the engine is in a horizontal position, it is not necessary to hold the crankshaft up. Do not turn the crankshaft when the Plastigage is in position to check clearances. 6. Check the main bearing clearances with Plasti- gage (B) as follows: a) Put a piece of Plastigage (B) on the surface of the lower half of the main bearing. 5-143

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