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  • ARP Main Stud Kit Installation – Ford 6.4L Powerstroke Diesel

Installation instructions for the ARP main stud kit, part #150-5802, for the Ford 6.4L Powerstroke diesel. ARP main studs reinforce the bottom end with stronger, more consistent clamping load. This guide covers thread cleaning, inspection, lubrication and the proper torque sequence.

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Application

  • Part Number: 150-5802
  • Application: Ford 6.4L Powerstroke Diesel
  • Inner studs: 5.950 in. long
  • Outer studs: 5.475 in. long
IMPORTANT: ARP recommends using the ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT provided with each kit rather than motor oil. Motor oil and other low-quality lubricants cause higher friction on the studs and inconsistent clamping force.

Installation Method

  1. To ensure proper thread engagement and accurate torque readings, clean ALL threads in the block. Chase the threads if necessary with a thread chaser.
  2. Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damage, plus proper fit, length and dimension.
  3. Screw the studs into the block “HAND TIGHT ONLY”. Inner studs are 5.950 in. long; outer studs are 5.475 in. long.
    NOTE: Loctite may be used if a permanent mounting of the studs is preferred.
  4. Install the main caps and check for binding or misalignment.
  5. Lubricate the stud threads, nuts and both sides of the washers with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT. Then install the washers and the nuts onto the studs and tighten them hand tight.

Preload (Torque) Recommendations

Following the manufacturer’s recommended torque sequence (see the diagram below), tighten the nuts in three equal steps to the specifications listed below, using ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.

  • Step 1: Studs (1–20) — 55 ft-lbs
  • Step 2: Studs (1–20) — 110 ft-lbs
  • Step 3 (Final Tighten): Studs (1–20) — 170 ft-lbs
ARP Main Stud Kit Installation – Ford 6.4L Powerstroke Diesel – bolt torque sequence diagram
Bolt torque sequence — tighten the 20 main studs in numbered order (1 through 20), working through each of the three torque steps in this same sequence.
FOOTNOTE: When changing from factory fasteners to high-strength fasteners, clamping force and tolerances will change. It will therefore be necessary to check the main bearing bores for proper size and out-of-round condition after installation of the studs, and to align hone the cylinder block if necessary. The main bores should always be align honed using the same fasteners and lubricant that will be installed during final engine assembly at the recommended preload.
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