Installation Method For N54 Long Head Stud Kits

Replaces: BMW part 11127574303

Application: BMW N54B30 turbocharged inline-six engine

Included: 14x 11mm Studs, 14x Washers, 14x Nuts and assembly lubricant

• It's crucial to perform drilling and tapping of the four outer 9mm and 10 middle holes in the engine block and and cylinder head head as well. Refer to “M9 to M11 conversion for BMW N54 block” and “M11 long studs drill+tap” document. This process enlarges outer 4 to 11mm and makes 10 middle ones deep enough, ensuring block is ready to accept the larger and longer studs. Contact HCR to order this service or ask your local machinist for help

1. Begin by lubricating the block end threads of the studs with engine oil.
2. Insert the studs into the block and tighten them to approximately 10Nm, which is hand tight using a 5mm Allen wrench.
   If you encounter any resistance, stop immediately. Back out the stud and inspect the threads on both the stud and the block. Use a Thread Chaser as needed to carefully clean and refine the threads if tightening by hand is not smooth and easy.
3. Install the head gasket and position the cylinder head, ensuring that both the washer surfaces and the cylinder head surface are completely degreased.
4. Before final tightening, generously apply ARP Ultra-Torque fastener assembly lubricant to the stud threads and nut flanges. Do not apply lubricant on washers and block surface. Proceed to install the washers and nuts onto the studs, tightening them by hand until snug.

• HCR strongly recommends the use of ARP Ultra-Torque fastener assembly lubricant over alternative lubricants like motor oil. This preference ensures reduced friction on the studs and consistent clamping force, guaranteeing optimal fastener integrity and reliability.

TORQUE PROCEDURE  Tighten the bolts sequentially as shown in bolt torque sequence diagram. Tighten to 40 Nm. Tighten to 90 Nm. Tighten to 130 Nm. Verify that all studs are securely tightened.

Bolt torque sequence

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