ISX CM2250 (2010-2013) – Bulletin 4021931 ISX CM2350 (2013-2017) – Bulletin 4021933
Tighten all main cap bolts to 150 N·m [111 lb-ft] .
Follow the numerical sequence stamped on the rod caps and use a center-outward pattern for the main caps to prevent uneven stress. cylinder head torque specifications for this same engine build? ISX Cummins Main and Rod Bolt Torque Specs Guide
The ISX connecting rod bolts have a specific torque-angle that differs slightly from the main bolts. Some older manuals call for a different torque for used vs new bearings – but this guide is for new assemblies. Use the "Wet" (oiled) specification. cummins isx main and rod bearings torque specs new
Always lubricate bolt threads and under the bolt heads with clean engine oil before installation.
The main bearings use a three-step process involving initial torque followed by a rotation (torque-to-yield). 203 N•m [150 ft-lb] Step 2: 407 N•m [300 ft-lb] Step 3: Rotate 90 degrees
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. ISX CM2250 (2010-2013) – Bulletin 4021931 ISX CM2350
After torquing mains, check crankshaft end play (0.004" – 0.012"). Tap crank forward/back before measuring.
If you have a bolt stretch gauge:
Are you working on a single-overhead-cam () or dual-overhead-cam ( DOC ) engine block? ISX Cummins Main and Rod Bolt Torque Specs
If you have followed the 95 lb-ft + 90° for mains and 75 lb-ft + 60° for rods, your rotating assembly is mechanically sound. Now prime the oil system before startup—but that is a topic for another article.
Surfaces must be free of debris. Apply a thin U-shaped bead of anaerobic sealant to the main bearing cap surfaces, ensuring it does not enter the bearing shell area. Cummins ISX Torque Specs: Main & Rod Bearings, Oil Pump
Ensure all oil passages are clear and bearing seats are spotless.
The clearance between a new ISX bearing shell and the crankshaft journal is thinner than a human hair.
Below are the standard torque specifications and sequences for the Cummins ISX main and rod bearings. 🛠️ Main Bearing Cap Torque Specs