Q: How to crankshaft install in engine reassembly on 2000 Ford Ranger?
A: Crankshaft installation is the first task in engine reassembly, assuming the engine block and crankshaft have been cleaned, inspected, and repaired. Position the engine with the bottom lacing up, then remove the main bearing cap bolts and lift out the caps, laying them out in order for correct installation. If present, remove the original bearing inserts from the block and caps, ensuring the bearing surfaces are clean. Clean the back sides of the new main bearing inserts and place one in each main bearing saddle in the block, ensuring the grooved insert is installed correctly. The oil holes in the block must align with those in the bearing insert, and no lubrication should be used at this time. Install the flanged thrust bearing in the third cap and saddle, clean the bearing surfaces, and check the oil holes in the crankshaft. Once the crankshaft is clean, lay it in position in the main bearings and check the main bearing oil clearance using Plastigage. After installing the caps with arrows pointing toward the front, tighten the main bearing cap bolts in three steps without rotating the crankshaft. Remove the bolts and caps carefully, comparing the width of the crushed Plastigage to determine the oil clearance, ensuring no dirt or oil interfered with the measurement. If the clearance is incorrect, verify the bearing inserts' sizes and check for any taper in the journal. Clean off any Plastigage material, then lift the crankshaft out, applying a thin layer of moly-base grease or engine assembly lube to the bearing surfaces and thrust faces. Lay the crankshaft back in place, clean the bearing faces in the caps, and apply lubricant before installing the caps with arrows pointing forward. Apply sealant where the rear main cap meets the cylinder block, install the bolts, and tighten them to the specified torque, starting from the center. Tighten the thrust bearing cap bolts to 10-to-12 ft-lbs, then tap the crankshaft to align the thrust surfaces. Retighten all main bearing cap bolts and install the rear main bearing oil seal, ensuring it is at the correct depth. For manual transmission models, install a new pilot bearing in the crankshaft end, rotate the crankshaft by hand to check for binding, and finally check the crankshaft endplay with a feeler gauge or dial indicator, confirming it is correct if the thrust faces are undamaged and new bearings are installed.