Some ISX engines have small side bolts on the center (thrust) main cap:
Check bolts for stretching, necking, or thread damage. Replace any bolt that shows signs of wear.
Common safe approach (for non-yield re-usable bolts, when manual absent):
The main bearing bolts on an ISX engine are "Torque-Plus-Angle" fasteners. This means you must use a high-quality torque wrench followed by a precise angle gauge. Standard Main Bearing Bolt Sequence Tighten all bolts to 150 lb-ft (203 Nm). Step 2: Tighten all bolts to 300 lb-ft (407 Nm). Step 3: Rotate each bolt an additional 90 degrees . Important Installation Notes
Always verify with Plastigage or a dial bore gauge before final assembly.
The of your ISX (e.g., CM870, CM871, CM2250, or X15)?
Cummins generally recommends replacing rod bolts whenever they are removed, as they are subject to high stress and can lose their clamping ability. However, if you choose to reuse bolts, the torque procedure is: