Thread Repair Kits for spark plug threads, 10 x 1.5 , 1,5 D

The V-COIL Thread Repair Kit is a complete system for repairing damaged threads. It is based on the principle of thread renewal through the use of high-strength thread inserts. Its unique aspect lies in the adaptation of this kit to the specific requirements of spark plug threads (M14x1.25), creating a new, even more robust thread for the spark plug. The kit is intended for repairing and restoring the original M14x1.25 thread by cutting a larger repair thread (here: M10x1.5).

Its Special Features and Advantages:

• Specialized for Spark Plug Threads (M14x1.25): Precisely matched for repairing the most common spark plug threads in engines.
• Reclaiming Scrap Parts: Enables the cost-effective restoration of cylinder heads or other components that would otherwise be deemed scrap.
• Higher Thread Load Capacity: The repair creates a new thread with superior properties regarding strength, corrosion resistance, and temperature resistance.
• Complete Kit: Contains all necessary tools (special tap, tang break-off tool, installation tool) and 10 thread inserts for immediate application.
• Multi-Application Tap: The included STI Combo Tap or HexTap SP allows for use with various drive tools (not included in the kit), increasing flexibility.

This repair kit is an indispensable tool for:

• Automotive Workshops and Mechanics: For quick and professional repairs of spark plug threads on engines.
• Motorcycle Workshops and Mechanics: A common problem in two-wheelers.
• Engine Reconditioning Shops: For restoring defective cylinder heads.
• Amateur Mechanics and Dedicated DIY Enthusiasts: Who are looking for a reliable and permanent solution for engine problems.

Your Challenge – Our Solution:

• Problem: Damaged Spark Plug Thread: A stripped or corroded spark plug thread leads to compression loss, engine misfires, and can ultimately cause costly engine damage. Replacing a cylinder head is extremely expensive and time-consuming.

  Solution: The V-COIL Repair Kit enables the permanent and high-strength repair of the thread. By using the specialized STI tap and the V-COIL thread inserts, a new, more resilient thread is created. This is a cost-effective alternative to replacing expensive engine parts.

• Problem: Repairs with Unreliable Solutions: Many "quick-fix" methods for thread repair are not permanent or do not provide the necessary strength and sealing required for a spark plug thread.

  Solution: V-COIL technology is a proven and standardized repair method that creates a thread often stronger and more resistant than the original. The high-strength stainless steel thread inserts offer excellent corrosion and temperature resistance, ensuring the longevity of the repair.

The V-COIL Thread Repair Kit combines specific features and quality standards that make it a top choice:

• STI Combo Tap (HSS-G, 10 x 1.5):

  The kit includes a special tap that cuts a new, larger thread into the damaged spark plug hole. The dimension 10 x 1.5 refers to this oversized thread, into which the thread insert is screwed. The material HSS-G (High Speed Steel, Ground) ensures maximum precision and tool life. The addition "Combo" or "HexTap SP" indicates a special geometry that optimizes the cutting process.

• Thread Inserts - Type S - Free Running M 10 x 1.5 – 1.5 D:

  These are the actual repair inserts.

  • Type S: Refers to the design of the insert (Standard).
  • Free Running: Means that the insert does not have a locking thread at the end but is continuous.
  • M 10 x 1.5: This is the external thread of the insert, which fits into the hole cut by the STI tap. IMPORTANT: The internal thread of the insert restores the original M14x1.25 spark plug thread! The "M 10 x 1.5" specified in the kit's nominal size refers to the size of the repair tool's thread, NOT to the target spark plug thread.
  • 1.5 D: Describes the length of the thread insert relative to its nominal diameter. "1.5 D" means the insert's length is 1.5 times its external diameter (here, 1.5 * 10 mm = 15 mm nominal length). This is a common length for spark plug threads.
  • Material: Stainless steel offers excellent corrosion and temperature resistance, ensuring the longevity of the repair in the engine environment.
  • DIN 8140: A standard for wire thread inserts, ensuring their quality and fit.
  • Tolerance ISO 2 (6H): Ensures that the internal repair thread (M14x1.25), after the insert is installed, has the correct tolerances for the spark plug.

• Tang Break-off Tool (No. 13) and Hand Installation Tool (No. 13 with Locking Ring):

  These tools are essential for a smooth repair process. The tang break-off tool is used to remove the drive tang at the end of the installed thread insert. The hand installation tool with locking ring allows for precise and controlled screwing of the thread insert into the prepared hole.

• Practical Plastic Cassette:

  The kit is supplied in a robust plastic cassette, ensuring organized storage and secure transport of all components.

Technical Note on Dimensions:

It is very important to note that the "10 x 1.5" specified in the product name refers to the dimension of the oversized thread to be cut by the STI tap, into which the thread insert is screwed. However, the kit is explicitly designed for repairing M14x1.25 spark plug threads. The thread inserts in this kit have an internal size of M14x1.25, but an external M10x1.5 thread to fit into the repair hole cut with the 10x1.5 tap. This is the V-COIL mechanism for restoring the original thread.

• Application: Repair of M14x1.25 spark plug threads
• Nominal Size of V-COIL Insert (External/Repair Thread): 10 x 1.5
• Length of Thread Insert: 1.5 D (1.5 x nominal diameter of repair thread = 1.5 x 10 mm = 15 mm)
• Kit Contents:
  • 1x STI Combo Tap, HSS-G, 10 x 1.5 (VÖLKEL 03632)
  • 1x Tang Break-off Tool, No. 13 (VÖLKEL 07013)
  • 10x Thread Inserts - Type S - Free Running (External M 10 x 1.5 – Length 1.5 D), Internal M14x1.25
  • 1x Hand Installation Tool with Locking Ring, No. 13 (VÖLKEL 08013)
• Thread Insert Material: Stainless steel
• Thread Insert Standard: DIN 8140
• Thread Insert Tolerance (Internal): ISO 2 (6H)
• Packaging: In plastic cassette
• EAN: 4022835040927
• Article Number: 04092

Q1: What specific spark plug thread is this repair kit designed for?

This repair kit is specifically designed for repairing M14x1.25 spark plug threads. Although the tap and the external thread size of the inserts are "10 x 1.5", the installed thread inserts internally restore the original M14x1.25 thread, allowing you to use the spark plug in its original size.

Q2: Can I use this kit to cut a completely new M10x1.5 thread?

No, this kit is not intended for cutting a conventional M10x1.5 thread. The included tap cuts a special oversized thread (also 10 x 1.5, but for STI inserts) that the thread insert fits into. The purpose is to repair an existing, damaged spark plug thread.

Q3: What are the advantages of stainless steel thread inserts?

Stainless steel thread inserts offer increased strength, corrosion resistance (important in humid or aggressive environments), and temperature resistance. This often makes the repaired thread connection more resilient and durable than the original, especially in the thermally stressed environment of a spark plug thread.

Q4: How long does such a thread repair last?

When applied correctly and using high-quality V-COIL inserts, the repair is permanent and provides a thread connection that is typically stronger and more resilient than the original thread. Its resistance to vibrations and temperature fluctuations is very good.

Q5: Do I need any other tools besides this kit?

In principle, the kit contains all the specialized tools necessary for the V-COIL repair method (tap, tang break-off tool, installation tool, inserts). However, you will still need standard tools such as a drill bit (to prepare the damaged hole to the correct diameter for the STI tap, if not already large enough), a suitable drill drive (e.g., cordless drill, power drill) for the STI tap, and a hammer for the tang break-off tool.