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ARP Automotive Racing Products

ARP Main Stud Kit, BMW M40/M42/M44

ARP Main Stud Kit, BMW M40/M42/M44

$152.99 USD
$169.99 USD $152.99 USD
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This ARP Main Stud Kit is designed to replace BMW 11111735525 for the BMW M40B16, M40B18, M42 B18, M43B16, M43B18, M43B19 or M44 B19 found in E36 and Z chassis. 

Upgrading from factory main bolts to ARP Main Studs is a simple, yet greatly beneficial upgrade. ARP Main Studs offer the following benefits: 

- Uniform Clamping Force: ARP Main Studs provide a uniform clamping force that OEM bolts cannot. With the improved distribution of pressure across main bearing caps comes better, more precise crank alignment for stability and longevity. 
- Improved Block Stability and Rigidity: ARP Main Studs improve block rigidity and therefore stability. This ensures maximum power transfer from the crank to the drivetrain, which in turn ensures: 
- Improved Throttle Response
- Greater Horsepower
- Higher Torque Output
- Prevent Main Cap Walk: This occurs as main caps shift and move out of position, which can cause crank and engine damage
- Reduced Risk of Fastener Stretching: Under high RPM applications and high loads, factory main bolts are prone to stretching and deforming. ARP uses advanced manufacturing techniques and high quality materials for hardware that is much less prone to deformation under load.
- Safeguard Engine Block Threads: Because ARP Main Studs have unmatched tensile strength, they are much less likely to deform or strip block threads under high loads. Additionally, ARP’s precision machining and manufacturing ensures that stud threads are both highly accurate and consistent.

When opting for main studs instead of factory bolts, it's important to note that the engine builder should mic the bores. Using studs may require a line hone to ensure proper fitment and alignment. A line hone is a machining process that can be used to resize and reshape the main bearing bores, ensuring that they are perfectly round and concentric. This is crucial for ensuring proper oil clearance and preventing premature bearing wear. By mic'ing the bores and performing a line hone if necessary, engine builders can ensure that the main studs are installed correctly and that the engine will perform reliably and at its best.

Installation Instructions: 

  1. To ensure accurate torque readings and proper thread engagement, thoroughly clean all threads in the engine block. If necessary, use an ARP chaser to chase the threads.

  2. Before installing any hardware, carefully inspect and clean it for defects, shipping damage, and proper fit, length, and dimension.

  3. Gently screw the main studs into the engine block by hand until they are snug.

  4. Install the main caps, checking for any binding or misalignment.

  5. Apply ARP Ultra-torque fastener assembly lubricant to the threads of the studs, nuts, and washers. Install the washers and nuts onto the studs and tighten them by hand. It is highly recommended to use the ARP Ultra-torque fastener assembly lubricant provided with the kit, as it provides consistent clamping force and reduces friction on the studs. Do not use motor oil or other low-quality lubricants.

PRELOAD (TORQUE) RECOMMENDATIONS

7. Following the manufacturers recommended torque sequence tighten the nuts steps 1-3

Step 1: Tighten to 20 ft-lbs.
Step 2: Tighten to 40 ft-lbs.
Step 3: Tighten to 60 ft-lbs.

with ARP Ultra-Torque fastener assembly lubricant

BMW M40 Applications:

3 Series

1987-1994     E30     316i / 318i
1991-1993     E36     316i / 318i / 318is

5 Series

1988-1992     E34     518i

BMW M42 Applications:

3 Series

1989-1991     E30     318i / 318is
1992-1996     E36     318i / 318is

BMW M44 Applications:

3 Series

1996-1999     E36     318i / 318is

Z Series

1996-1999     E36/7     Z3 1.9i

ARP-MSK-M42

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