Common two-step example (if bolts are not torque-to-yield and no manual available):
If bolts are torque-to-yield (common): torque to 30–40 lb·ft then turn 90°–120° (check bolt marking/part number).
Rod cap tightening sequence:
Scenario A: Standard Main Bolts (Older Style)
Scenario B: New Style Main Bolts (Angle Torque/Micro-Encapsulated) cummins isx main and rod bearings torque specs new
The phrase "Cummins ISX main and rod bearings torque specs new" is general. Here are model deviations:
Torque specs alone do not guarantee a successful rebuild. You must verify oil clearance using Plastigage or a bore gauge.
How to Plastigage:
Standard Oil Clearance:
If clearance is outside spec, you must use undersized or oversized bearings.
This varies significantly. Use the chart below based on your engine family.
| Engine Variant | Bolt Type | Step 1 (Sequence) | Step 2 (Sequence) | Step 3 (Angle) |
| :--- | :--- | :--- | :--- | :--- |
| ISX (2007-2010)
(Cap screw M14x2.0) | Clean/dry threads | 35 lb-ft (47 Nm) | 80 lb-ft (108 Nm) | None |
| ISX (2010-2013)
(M14x2.0 w/ lubricated) | Oil on threads | 30 lb-ft (41 Nm) | 59 lb-ft (80 Nm) | None |
| ISX (2013-2018)
(TTY Bolts) | Clean/dry | 59 lb-ft (80 Nm) | None | +185° |
| ISX15 (Egr after 2016) | Clean/dry | 59 lb-ft (80 Nm) | None | +210° |
Main Bearing Torque Sequence (10 bolts – typical): Common two-step example (if bolts are not torque-to-yield
Most common ISX (2013-2018) sequence:
Start at #4 (center), then #2, #6, #1, #5, #3, #7
Torque specs are based on friction. If you torque a dry bolt to 95 lb-ft, the actual clamping force is 50% lower than a lubricated bolt. Always oil the threads and washer faces of new ISX bolts.
| Component | Specification | | --- | --- | | Bolt type | M16 x 2.0 Property Class 10.9 (Wet torque) | | Lubrication | Clean 15W-40 engine oil (not assembly lube on threads) | | Step 1 Torque | 90 lb-ft (122 N·m) | | Step 2 Torque | 130 lb-ft (176 N·m) | | Step 3 (Final) | Angle-turn +90 degrees |
Note: On older ISX CM570/CM870, the final step may be +60 degrees instead of 90. Check your engine serial number. If bolts are torque-to-yield (common): torque to 30–40
You will see different specs online for "used" bearings vs. "new" bearings. Why?
If you are installing NEW bearings, you MUST use NEW bolts, and you MUST use the full angle spec. Do not listen to old-timers who say "just ugga-dugga it." The ISX is a precision engine; 5 degrees off on a rod bolt can reduce clamping force by 30%.