TIME-SERT 1812COREBS Rocker Bolt Hole Thread Repair Kit M8x1.25

This is for second time repairs when a Helicoil or other brand has failed leaving a larger hole to be repaired. Since it is oversize the the outside diameter of the inserts are larger in diameter allowing a second chance to repair holes that were previously repaired.

This tooling has been used in rocker arm thread repair where the threads must start a few millimeters deep below a "Slot".

The core drill countersink combination will have to set by hand. We use this special 4 flute core drill because it makes drilling through the line-up slot easy. Using a traditional 2 flute is difficult because the drill it tends to hang on the slot and break.  *When installing BIG-SERT inserts do NOT back up. Use a continuous right hand rotation of the install driver tool.

Instructions Included:

KIT CONTENTS

1. Step Core Drill w/collar

2. Tap

3. Insert Driver

4. Tap guide 75825

5. Inserts qty 5 part number 58121

6. Hex Key 55516

1812CORE pdf Instructions

 Related Products

TIME-SERT Big Sert 58121- Replacement Inserts for 1812CORE BS 

*Note, some GM engines use a 10mm rocker arm bolt. Please verify your bolt size before ordering.