DPTOOL 14mm Back Tap Spark Plug Thread Repair Tool M14x1.25 Thread Chase Tap For Repairing Threads And Preventing Metal Shavings From Entering The Cylinder Product Features Function: Used To Fix Severely Cross Damaged Spark Plug Hole Thread, Cleaned Up The Threads Without Leaving Scraps In The Bore, No Need Pull Cylinder Head, No Need Coil Insert.

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. 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. 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. 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 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. Therefore, it is more durable hard to damage, is a nice heavy and precise tool Tips: Put it straight through the hole, expand it, back thread it 3-5x. 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, Just be sure to go slow. When u hit a hard patch, back it up a little then go forward again.