Mopar 4323784 CRANKSHAFT-Assembly

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Crankshaft installation is typically one of the initial tasks in engine reassembly, assuming the engine block and crankshaft have been thoroughly cleaned, inspected, and repaired. Position the engine with the bottom facing up, then remove the main bearing cap bolts and lift out the caps, laying them out in order for correct reinstallation. If old bearing inserts remain, remove them and clean the main bearing surfaces with a lint-free cloth. Clean the back side of new main bearing inserts and place one half in each main bearing saddle and the corresponding half in the main bearing cap, ensuring proper alignment of tabs and oil holes without using lubrication. The flanged thrust bearing should be installed in the number three saddle. Clean the bearing faces and crankshaft main bearing journals, checking the oil holes for dirt. Once the crankshaft is clean, carefully position it in the main bearings with counterweights sideways. Before permanent installation, check the main bearing oil clearance using Plastigage, placing it on each crankshaft main bearing journal without crossing oil holes. Clean the bearing faces in the caps and install them in their respective positions with arrows pointing forward, tightening the main bearing cap bolts in three steps to the specified torque without rotating the crankshaft. After removing the bolts and caps, compare the crushed Plastigage width to the scale for oil clearance, ensuring it meets specifications. If clearance is incorrect, verify the bearing insert size and check for dirt or oil interference. Scrape off any Plastigage material carefully, then lift the crankshaft out, clean the bearing faces in the block, and apply a thin layer of high-quality moly-based grease to each face, including the thrust flange. Install the rear main oil seal, then lay the crankshaft back in place, clean the bearing faces in the caps, apply grease, and install the caps with arrows pointing forward. Tighten the bolts to specified torque, starting from the center main and working outward, using a brass or lead hammer to center the thrust bearing before tightening its cap bolts. Rotate the crankshaft by hand to check for binding, and finally, check the crankshaft end play with a feeler gauge or dial indicator.

After lifting the crankshaft out of the engine, ideally with assistance due to its weight, return the bearing inserts to their original positions on the engine block and tighten the caps' bolts finger tight.

Measuring at various points around the journal's circumference helps determine if the journal is worn out-of-round, and measurements should also be taken at each end of the journal near the crank throw to check for taper.

The stamp indicates whether one or more rod or main bearing journals are ground undersize, specifically by 0.001 or 0.010-inch.