Every mechanic knows this moment: you tighten the screw and suddenly resistance disappears. The gwint “floated”. In modern automotive, based on aluminum feet, it's everyday. But calmly – the broken thread is not a reason to replace the entire component. Thanks to modern workshop toolsregeneration is faster and often more durable than the original.
Why are the threads failing?
Before you choose the right set in Autona storeIt's worth knowing why there's been a malfunction. The most common causes are:
No dynamometric key used (too much torque).
Corrosion and oxidation of material (especially in steel-aluminium connections).
Pollution (balls, sand) inside the hole during installation.
Spring inserts vs. sleeves – what to choose?
Two main methods are used in professional repair. The choice depends on the location of the fault and load.
Spring inserts (HeliCoil type): Ideal for spark plugs or valve covers. They're flexible, and they're great at distributing pressure.
Thin wall sleeves: Best for extreme loads, e.g. head screws or oil stoppers. They create a solid steel barrier.
Tip: Check out our professional Thread repair kitsthat contain everything you need for both of these methods.
Comparison of thread repair methods
| Characteristics | Spring inserts | Solid sleeves |
| Strength | High (spreads forces) | Extreme (lite steel) |
| Interference in material | Small (thin drill) | Greater |
| Application | Headgear, blocks, aluminium | Oil stoppers, brake yokes, candles |
| Mounting difficulty | Easy | Easy |
How do you repair step by step?
To make your job professional, stick to the proven scheme:
Step 1: Drilling. Remove the remnants of the old thread with the drill from the set. Remember to keep your axiality!
Step 2: New thread. Use a special threader from the set. Never do it dry Use the oil to thread.
Step 3: Installation. Insert the cartridge or sleeve using the attached instrument.
Step 4: Final. Fractured pick (in case of cartridges) with a special pick.
If your problem is a leaky oil bowl, don't look for half-measures. Check Dedicated Oil stopper thread repair kit – it is an investment that returns one service each.
FAQ – Workshop Questions
Is the repair safe in the engine?
Yes, subject to careful removal of the saw blades (use grease on the threader to put the saws on it).
Summary
Repairing a broken thread is one of the most profitable services in the workshop if you have the right equipment. Do not risk “trouble” and gluing screws. Bet on professionalism and proven workshop toolsthat build your customers' trust.
Do you have a problem with a particular thread? Contact us or check our offer Workshop tools – we will choose a solution prepared for your workshop!
