24V Cummins Main Stud Installation Guide (1998.5–2006 5.9L) — MP876

This guide covers installation of the XOTIC PERFORMANCE™ MP876 main stud kit for the 1998.5–2006 5.9L 24V Dodge Cummins. Prefer a printable copy? Download the PDF manual.

Why a 24V Cummins needs main studs

The 24V 5.9L is the engine people build hardest, and the failure mode moves as the power goes up. Head studs fix the deck; after that, the load has to go somewhere, and it goes down the rod and into the main cap. A 24V running big fuel, a large charger and a heavy tow load is delivering main cap loads a long way beyond what Cummins specified around the factory bolts. Main cap fasteners are what keep the crankshaft bearing bores round and located under that load.

Studs do it better than bolts for a structural reason. A bolt is torqued into the block, so it twists and stretches at the same time; a stud is threaded in finger-tight and stays still while the nut is torqued against it, loading the stud in pure tension. That produces more consistent, more accurate preload — the tensile force in the fastener that becomes clamp force in the joint — and preload is what prevents cap walk and bore distortion. XOTIC PERFORMANCE™ main studs are manufactured from our premium XOTIC 7200 steel alloy and backed by a lifetime warranty.

What's in the MP876 kit

• 14 × main studs (XOTIC 7200 alloy)
• 14 × hardened parallel washers
• 14 × nuts
• 1 × socket
• 1 × allen wrench
• 1 × fastener assembly lubricant

Before you start: verify first

Confirm that part number MP876 is compatible with your application before installing any components. Inspect all package contents for damage and clean as necessary to ensure accurate installation. Report any obvious defects or shipping damage to us before proceeding.

How to install main studs on a 24V Cummins

1. Chase the block threads. Clean the threads in the block with a thread chaser prior to installing the studs, to ensure accurate fitment and precise torque readings. The correct tool here is the M12 x 1.5 chaser (CS303), available separately.
2. Thread the studs in by hand. Screw the main studs in as tight as can be made by hand — no tool necessary, and do not apply torque. Loctite may be used for permanent stud installation, but the fasteners must be fully torqued before the Loctite sets.
3. Check stud height with a straightedge. Use a straightedge ruler to measure the distance from the mating surface (deck or main cap) to the top of each installed stud. Ensure all studs of the same length group sit level with each other (within 1 mm / 0.040”). Uneven height may indicate debris or incorrect thread engagement. Properly installed studs will bottom out smoothly and show uniform height across all positions. If a stud appears higher or lower than the others, remove it, re-clean the hole, and reinstall by hand. Do not use tools to force studs deeper. Incorrect stud seating can cause off-angle stress, uneven preload, or stud fracture during engine operation.
4. Install the main caps. Set the caps in place and ensure appropriate alignment before any load goes on them.
5. Lubricate. Using the fastener assembly lubricant included in the package, lubricate the threads of the main studs and the nuts.
6. Hand-tighten the nuts. Thread the nuts onto the studs as tight as can be made by hand.
7. Torque in three equal steps. Working in the sequence shown in the manual's torque sequence diagram, tighten the nuts through the three stages below. Never go straight to the final value.
8. Check the bores. With the studs torqued, check the main bores for size and roundness, and align hone if necessary using the final assembly fasteners and lubricant at the specified torque.

24V Cummins main stud torque specs

Frequently asked questions

What are the main stud torque specs for a 24V Cummins?

42 ft-lbs, then 84 ft-lbs, then a final 125 ft-lbs — three equal steps, following the sequence in the manual.

Does this kit fit a 6.7L Cummins?

No. MP876 covers the 1998.5–2006 5.9L 24V. Confirm your engine against the fitment before ordering.

Do I need to align hone after installing main studs?

Check first, then decide. Measure the main bores for size and roundness once the studs are torqued. If a hone is needed, do it with the same studs, nuts, and assembly lubricant you'll use for final assembly, torqued to spec.

What thread chaser does the 24V block take?

The M12 x 1.5 chaser (CS303). Chasing is not tapping — a chaser cleans existing threads without cutting new material.

While you're in there

If the 24V is apart far enough for main studs, the deck and the rods deserve the same hardware. See our 24V Cummins head stud guide (CP876) and the 5.9L connecting rod bolt kit (CP114).

Need help?

For technical support, email support@xotic-performance.com. All XOTIC PERFORMANCE™ fasteners are covered by our limited lifetime warranty. Finished your install? Tag #XOTICPERFORMANCE on Instagram for a chance to be featured.

© 2026 XOTIC PERFORMANCE™. This installation guide is an original copyrighted work of XOTIC PERFORMANCE™. Reproduction, distribution, or use of this content in whole or in part without written permission is prohibited. Doc ref: 2025.05.20 (web edition 2026.08).