How to Install a Helicoil

Save

Stripped and broken threads are a fact of life in auto repair. Even if the threads are damaged beyond a simple re-tap, the mounting hole can still be fixed and reused. Helicoil inserts allow you to replenish the threads, even if the threads are completely removed from the bolt hole, a common occurrence with aluminum threads. The procedure for installing a Helicoil is the same for all hole diameters, and everything you need to perform the thread repair is included in a Helicoil kit.

Things You'll Need

  • Drill
  • Helicoil Kit
  • Thread lock
  • Hammer
  • Remove the bolt from the stripped threads. If there is a broken bolt remaining in the hole, use a bolt extractor to remove the bolt from the threaded mounting hole.

  • Place the Helicoil recommended drill bit for the hole size being repaired into the drill. Drill the hole deep enough to accommodate the Helicoil insert and the bolt that is going to be threaded into the hole.

  • Tap the drilled hole with the tap specified in the Helicoil kit. Keep the tap straight with the hole. Turn the tap in a clockwise motion to thread the hole. Turn the tap until it binds, back the tap up a 1/4 turn; continue to thread the hole in a clockwise direction. Run the tap to the bottom of the hole. Do not try to exert heavy pressure on the tap. Carbide taps are brittle and can easily be broken off in the hole.

  • Thread the Helicoil on the mandrel of the supplied Helicoil installation tool. Liberally apply thread lock to the Helicoil insert. Place the Helicoil insert into the hole. Thread the Helicoil insert into the hole until it rests at least a 1/4 turn below the surface of the metal having the stripped threads repaired. Remove the insert tool by turning it counterclockwise.

  • Insert the tang break-off tool into the repaired hole. Hit the end of the tang tool with a hammer to snap off the tang. If you are repairing the threads in a large hole, reach into the hole with a pair of needle nose pliers and grasp the tang. Twist the tang back and forth until it breaks free of the Helicoil insert. Allow the thread lock to set-up before re-installing a bolt into the repaired hole.

References

Promoted By Zergnet

Comments

You May Also Like

  • How to Remove a Helicoil

    Due to the design of the Helicoil insert, you need a specialized tool to remove it from the repaired hole. The tool...

  • How to Use a Helicoil

    Threads in softer metal, like aluminum, can strip from the base material when you remove and reinstall a fastener repeatedly. To make...

  • How to Install Helicoil in an Aluminum Head

    Aluminum heads require strong threaded connections to keep an engine functioning correctly. The soft nature of aluminum allows threads to pull from...

  • How to Install a 3/8x16 Helicoil

    A 3/8-inch bolt with 16 threads-per-inch bolt often requires Helicoil inserts to repair damaged threads. The abundance of 3/8-16 inch bolt thread...

  • Instructions for Helicoil Installation

    Using a Helicoil kit to repair stripped threads on a car part is one way to keep some of your hard-earned money...

Related Searches

Check It Out

How To Travel For Free With Reward Points

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!