Your cart is empty.
Your cart is empty.Product Description
14mm Back Tap Spark Plug Thread Repair Tool
Function:
- Used it to fix a severely cross damaged spark plug hole thread, cleaned up the threads without leaving scraps in the bore.
High Quality Material:
- Made of high quality 42CrMo steel, its material is equivalent to 4140 steel, with high strength and toughness, good hardenability, no obvious tempering brittleness, high fatigue limit and multiple impact resistance after quenching and tempering, and good low-temperature impact toughness. Therefore, it is more durable hard to damage, is a nice heavy and precise tool.
How to use
- 1. Clean the tool surface and apply grease
When using, first wipe the threading tap, then apply a little grease (or use anti seize agent) on the threading device.
- 2. Turn the tool patiently and carefully
Put it straight through the hole, expand it, don't put at widest setting on first try.Slowly work your way wider and wider with each tap. After slowly widening it out over 4 taps, Then reverse it in reverse, especially when it started getting tougher to turn, turning from side to side from time to time, at the same time, during the whole process, the force should be moderate, not too high or too low, and maintain good patience and caution. In this way, after multiple turns, the debris will enter the hole of the tool and then be pulled out.
- 3. Clean up metal shavings
After the residual substance is pulled out by the tool, turn the nut at the handle to make the drill bit of the tool retract, open the crack at the thread, and clean it. Then turn the nut in reverse to restore the tool head to its original state. Then continue to apply a little grease to the thread.
- 4. Repeat operations
Continue to insert the hole for rotation, so that the remaining residue again into the crack, allowed to cut the threads from the inside out and not worry about stuff going down into the engine. After several patient operations, the spark plug thread can be successfully repaired.
Unique Advantages
Our 14mm spark plug thread repair tool has the following multiple advantages over traditional repair tools:
- No Need to Pull Cylinder Head
- No Metal Left in the Engine
- No Need to Insert Coils
- Easily enlarges the threaded area
- Straightens clogged spark plug threads
- Ability to pass through the spark plug hole and into the gas chamber
Special Design for Thread Cracks
The crack at the thread of the tool is to draw the metal shavings into the tool during rotation, so that they will not fall into the engine, effectively protecting the safety of the engine.
Tips for Use:
just don't tighten the knurled knob too much. As you're threading it out, loosen the knob if it starts to feel tight, and repeat many times.
Christina Nicole Sharp
2025-09-05 11:53:10
Works great thanks
gary coburn
2025-08-03 11:43:29
Worked great for me
Mr. Consumer
2025-08-02 12:07:48
Worked great to clear spark plug hole threads in a GM LS engine. Great design that expands once inside then you back it out to clear threads from inside out. So glad I found this tool!
Tony Charron
2025-07-18 10:55:32
Item arrived fairly fast. It was defective and the internal plunger to spread the tap was not attached to the tightening nut at the end of the tool. I would have to force the jaws apart in order to seat the plunger correctly, which would have warped the tool and made it as useful as a submarine with screen doors. Sending back ASAP. Very unhappy
captain frank
2025-06-07 18:55:09
not that easy to use had to remove cylinder head
Jorgr
2025-03-17 12:36:33
Repare la rosca de la tapa de cilindro sin problemas , excelente producto
Jungle Pete
2025-03-14 16:56:02
I don't know how many stars are appropriate since this tool, the shorter version, was too short for my 2000 Honda Civic DX spark plug mounting point. I had to return it. It seems like an adequately made tool, but maybe not repair shop quality. Certainly good enough for a fix or two. I ended up using a wholy different method, but kinda wish I"d had the longer version, as this is a neat tool conceptually.
Rick B
2024-12-23 11:31:04
Its ok that about all
Recommended Products