Some procedures recommend an initial "seat" for caps with thrust bearings by tightening to 150 ft-lb [203 N·m]
Do not attempt to "guess" the 60-degree or 90-degree final turns. Use a mechanical torque angle gauge or a digital torque wrench with a built-in gyro sensor. Over-rotating can snap the bolt, while under-rotating will cause the cap to walk, destroying the engine block.
Ensure all oil holes in the crankshaft are clear, and the crankshaft journals are free of debris.
Measure the free length of the bolts against OEM maximum stretch specifications. If a bolt exceeds the maximum allowable length, it must be replaced. Many master builders prefer to install brand-new bolts during any bottom-end overhaul for peace of mind. 4. Verify Crankshaft Rotation
Before you touch a torque wrench, you must verify three things:
The Cummins ISX engine uses a rod bearing design, which requires specific torque specs for proper tightening. Here are the recommended torque specs for the rod bearings:
After torquing, check for side clearance (side play) between the rod and the crankshaft cheek to ensure the rod is not binding. Essential Best Practices for New Bearings
Tighten the rod bolts to 150 N·m [111 lb-ft] .
Main bearing caps use a different torque value and a larger final rotation angle. : Tighten both capscrews on each main bearing cap to : Loosen both capscrews completely. : Retighten in the recommended sequence to (149 N•m). : Rotate each capscrew an additional 180 degrees JustAnswer Critical Assembly Tips ISX Cummins Rod And Main Bearing Torque Specifications
Before you install the oil pan and fire up that ISX, run this checklist:
rod bolts, skip steps 1 and 2. Start directly by tightening them to 52 ft-lb, then rotate 60 degrees. Industrial Parts Depot Main Bearing Torque Specs
For new connecting rod capscrews , the procedure includes a "torque-to-yield" style seating step.
Retighten all main bearing cap bolts to Step 5
Before any bolt is tightened, the foundation must be sound. This means checking the main bearing journals for wear and measuring your oil clearance.
