General purpose thread repair kits are available commercially.
| CAUTION | Refer to Safety Glasses Caution in Cautions and Notices. |
| IMPORTANT | Refer to the thread repair kit manufacturer's instructions regarding the size of the drill and which tap to use. |
Always avoid any buildup of chips. Back out the tap every few turns and remove the chips.
Scheme 395
Scheme 396
- Determine the size, the pitch, and the depth of the damaged thread.
- Adjust the stop collars on the cutting tool as needed. Tap the stop collars to the required depth.
- Drill out the damaged thread.
- Remove the chips.
- Apply clean engine oil to the top thread.
- Use the tap in order to cut new thread.
- Clean the thread.
- Screw the thread insert onto the mandrel of the thread insert installer. Engage the tang of the thread insert onto the end of the mandrel. IMPORTANT: The thread insert should be flush to 1 turn below the surface.
- Lubricate the thread insert with clean engine oil - except when installing in aluminum - and install the thread insert.
- If the tang of the thread insert does not break off when backing out the thread insert installer, break off the tang using a drift punch.