Krenlory 5334-14 Thread Repair Kit M14 x 1.25, Spark Plug Hole Thread Repair Kit Includes 14mm Reamer Tap, Insertion Tool & (3) Inserts, Spark Plug Saver

【Universal Compatibility】Easily and permanently repair stripped or damaged M14 × 1.25 spark plug threads on aluminum or cast-iron cylinder heads. 5334-14 thread Repair Kit compatible with both taper-seat and gasket-style plugs, restoring threads to their original size and strength. Perfect for cars, trucks, lawn mowers, chainsaws, pressure washers, motorcycles, and other gasoline engines — ideal for restoring threads in spark plug holes, engine blocks, and various metal components. Replacement for OE Part # 5334-14

【Comprehensive Spark Plug Port Repair Kit】Spark plug repair kit includes Qty-3 steel inserts in different lengths — short reach (0.309 In.), standard reach (0.425 In.), and long reach (0.673 in.) — to fit most engine types; Qty-1 tapered piloted tap and Qty-1 expanding driver tool, providing a complete and convenient solution for spark plug thread repair. Three insert lengths ensure compatibility with all common spark plug reaches. Metric 14mm diameter with a 1.25mm thread pitch

【Perfect Design】 Spark plug thread repair kit includes a piloted tapered tap designed for perfect alignment and no drilling, restoring original spark plug threads with ease. The tap’s narrow end matches spark plug’s thread size, tapering to the insert’s larger thread for a secure fit. Grooves on the tap capture metal chips for clean installation. Expanding driver sets the insert flange, positive mechanical locking knurled teeth firmly into cylinder head to prevent loosening. 3 insert lengths fit all spark plug reaches

【Cost-Effective Permanent Spark Plug Thread Repair】 M14-1.25 thread repair kit easily and permanently repair stripped or damaged spark plug threads caused by wear, corrosion, or over-torque. Restores threads to original size for a precise fit, fixing cylinder heads without leaks. Ideal for DIYers, mechanics, and small engine repairs. A quick, low-cost solution that saves hundreds compared to head replacement, delivering long-lasting durability and flawless performance

【Superior Material】 Tapered tap is precision CNC-machined from 42CrMo steel for exceptional toughness and razor-sharp cutting performance. Expanding tool and 3 inserts are expertly forged from heat-treated blackened 40Cr steel for maximum hardness and superior corrosion resistance. High-strength steel inserts with flanges deliver secure, leak-free repairs, precise alignment, and long-lasting durability—saving time and effort when restoring damaged spark plug threads

【Ease of Use】 Fix spark plug threads with this user-friendly kit! Remove the cylinder head, lubricate tap and carefully tap the hole with a 3/8 ratchet ensuring straight alignment. Clean threads and apply high-temperature RTV silicone. Select the correct insert length, screw in with the knurled end facing up until flush. Use the expanding tool and gently tap to lock the insert. Reinstall spark plug to recommended torque — a durable, leak-free repair without costly replacements

【Warm Tips】 Before tapping, coat the tap with grease to prevent metal shavings from entering the engine. Always back out the tap after every turn or two to clear threads.It's recommended to remove the cylinder head before repair to insure chips do not enter cylinder

【100% Satisfaction Guarantee】 If you're not 100% satisfied with our items, simply return it for a refund within 30 days. All Krenlory products support 12-month warranty. Your trust is our priority. Please reach out to us with any concerns