DAYUAN 114-Piece Oil Pan Thread Repair Kit — M13–M22 Taps, Replacement Drain Plugs & Copper Washers

DAYUAN 114-piece Oil Pan Thread Repair Kit restores stripped or worn drain plug threads by re-tapping the hole slightly oversize and fitting a new drain plug and copper washer.

If an oil sump, gearbox or differential drain plug has a damaged thread, removing the old thread and installing a new, slightly larger one is a fast way to stop leaks and return serviceability. The DAYUAN kit bundles hardened steel taps, matched replacement drain screws and copper sealing washers in a blow-molded carrying case so you can complete the repair on many common vehicle makes without fabricating parts.

Which vehicles and parts will this kit work on?

This set covers a broad range of European and Asian makes and fits most sump, gearbox and differential drain plug threads that accept the supplied sizes. It’s designed for applications where the original thread can be safely re-tapped to the next standard diameter.

• Compatible with Audi, VW, BMW, Citroen, Fiat, Ford, Seat, Honda, Mazda, Mitsubishi, Opel, Peugeot, Renault, Toyota and Volvo.
• Includes taps and plugs sized M13, M15, M17, M20 and M22 in common pitches.
• Works on oil pans, gearbox housings and differentials where material condition allows re-tapping.

How do I use the DAYUAN thread repair kit safely?

Repairing a drain thread is straightforward but requires care to avoid introducing metal shavings into oil passages or over-enlarging the hole. Follow the step sequence and use proper tools like a tap wrench and clean the area after cutting.

• Remove the damaged drain screw and clean the hole thoroughly before tapping.
• Select the tap one size larger than the original thread (e.g., original M14 → use M15 tap).
• Use a tap wrench, cut gradually, clear chips, and finish by testing fit with a new plug and washer.

What exactly is included and what are the materials?

The kit contains hardened steel taps, replacement drain screws and copper sealing washers organized in a protective plastic case. Components are chosen for durability and to match common metric thread pitches used on vehicle drain plugs.

• 6 hardened steel taps: M13×1.25, M13×1.5, M15×1.5, M17×1.5, M20×1.5, M22×1.5.
• 36 replacement oil drain plugs: six of each size/configuration for quick swaps.
• 72 copper washers: assorted counts to suit each plug size for reliable sealing.

When should a mechanic choose this kit versus replacing the housing?

Use this kit when the drain hole material is sound but the thread has been stripped or damaged; it’s a cost-effective repair compared with replacing the oil pan or gearbox cover. If the housing is cracked, heavily corroded or has lost material, a component replacement is safer.

• Good solution for worn or rounded threads that can accept an oversize tap.
• Not suitable if the sump or housing is fractured or extensively corroded.
• Professional-grade steel construction supports repeated workshop use.

Who is this for: The DAYUAN 114-piece Oil Pan Thread Repair Kit is aimed at automotive technicians, independent garages and experienced DIYers who encounter stripped drain plug threads across European and Asian car makes. It’s ideal for shops that prefer an organized, portable repair solution and for owners who want a durable, reusable toolset to stop leaks quickly without replacing housings.