ROD AS 1250025 - Caterpillar

Remove Crankshaft (3304)
start by:a) remove flywheel housingb) remove timing gear coverc) remove pistons1. Turn the crankshaft until the "C" mark on crankshaft gear (2) is in alignment with the "C" mark on camshaft gear (1). To keep the engine timing correct during removal and installation of the crankshaft, put a mark on the teeth of the magneto drive gear and idler gear at location (A). Put a mark on the teeth of the idler gear and camshaft gear at location (B). The engine timing will be correct when the marks at locations (A) and (B) are in alignment and the "C" marks on the crankshaft and camshaft gears are in alignment.2. Install a 3/4"-16 NF bolt in the gear end of the crankshaft. Install two 5/8"-18 NF bolts in the flywheel end of the crankshaft. Fasten a hoist to the crankshaft.3. Remove main bearing caps (3).4. Remove the crankshaft from the cylinder block. The weight of the crankshaft is 145 lb. (65 kg).5. Remove main bearings (4) from the block and from the caps. Remove the thrust bearings.Install Crankshaft (3304)
1. Clean the surfaces on the cylinder block for the main bearings. Install the upper halves of the main bearings in the block.2. Put the crankshaft in position in the cylinder block with a hoist. Make sure all of the timing marks are in alignment.3. Clean the Nos. 1 and 5 main bearing caps. Install new bearings in caps. Temporarily install caps to hold crankshaft in place.
Make sure part number on cap is toward front of engine, and number on bottom of cap is the same as number on block when caps are installed.
4. Clean the Nos. 2, 3 and 4 main bearing caps. Install new bearings in the caps. Put clean engine oil, bolts threads and surfaces of the washers that make contact with the caps.5. Check the bearing clearance with Plastigage (A). Install the caps and tighten the bolts to a torque of 30 3 lb.ft. (40 4 N m). Put a mark on each bolt head and the bearing caps. Tighten the bolts 90° more. Remove the bearing caps and measure the thickness of the Plastigage. The main bearing clearance (Plastigage thickness) with new bearings must be .0029 to .0069 in. (0.074 to 0.165 mm). The maximum permissible clearance with used bearings is .010 in. (0.25 mm).6. Put clean engine oil on the bearings. Put the caps in position on the engine and install the washers and bolts. Tighten the bolts to a torque of 30 3 lb.ft. (40 4 N m). Put a mark on each bolt head and the bearing caps. Tighten the bolts 90° more.7. Remove the Nos. 1 and 5 main bearing caps. Follow the procedure in Steps 4 and 5 and check the main bearing clearance for the Nos. 1 and 5 main bearings.8. Follow the procedure in Step 6 and install the No. 1 main bearing cap.9. Put clean engine oil on thrust bearings (1). Install