Dodge Truck

Revised main and rod bearing torque procedures. If you work on 1986-2002 Dodge trucks, be advised that there are new crankshaft bearing torque specs and tightening sequences for Cummins 3.9L and 5.9L B and ISB engines. Cummins has determined that the torque-plus-rotate method of tightening capscrews applies a more uniform clamping load than the previous method, so this information applies to all B Series Cummins/Chrysler diesel engines.

For the main bearings, first make sure all bolt holes are clean and that all bearings have the correct and adequate lube. Then install all bearing halves and bearing caps with the numbers toward the oil cooler side of the engine. Use clean 15W-40 oil to lightly lubricate the bolt threads and underside of the main bearing bolt heads. Install the bolts using the proper sequence (see illustration). First tighten the bolts to 37 ft-lb, then spin the crankshaft a him or so to ensure proper rotation. Next, using the same sequence, tighten to 45 ft-lb. Lastly, tighten to 66 ftlb. Now, in sequence, rotate the bolts an additional 90 deg. After tightening, use a feeler gauge to measure the crank endplay between the No. 6 main bearing thrust surface and the shaft. The reading should spec out to .004 to .017 inch.

For the rods, use clean 15W-40 oil to lubricate the rod cap bolt threads and underside of the connecting rod bolt head. Alternately tighten the bolts to 22 ft-lb, then to 44 ft-lb. Next, alternately turn the bolts an additional 60 deg. Finally measure the rod side clearance, looking for .004 to .013 inch. Note: Be sure to measure the rod clearance, not the rod bearing cap clearance!