Genuine Mazda Valve Seat Spring Retaining Collets MX-5 MK3 / NC 2.0 / 1.8 ( 06-15) LF01-12-114

Genuine Mazda LF01-12-114 Valve Spring Retaining Collet Pair

Replacement Genuine Mazda valve spring retaining cotter pair for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 (NC) 1.8L and 2.0L models listed in the compatibility table.

Valve collets, also known as valve cotters or valve spring retainer locks, are small but critical components in the cylinder head. They lock the valve spring retainer to the valve stem, keeping the valve spring securely located and allowing the valve to open and close correctly with the camshaft and valvetrain.

There are typically 16 pairs of valve spring retaining cotters required per vehicle on the MX-5 NC 16-valve engine. Each valve uses one pair of cotters, so a full cylinder head rebuild requires one pair per valve.

This part is commonly replaced during cylinder head rebuilds, valve replacement, valve spring replacement, camshaft or valvetrain work, or when the original cotters are worn, damaged, lost during disassembly or no longer suitable for reuse.

• Part type: Valve cotter / valve spring retaining cotter / valve collet
• Primary use: Secures the valve spring retainer to the valve stem
• Location: Cylinder head / valvetrain
• Quantity per valve: 1 pair
• Quantity per vehicle: 16 pairs for a complete 16-valve engine set
• Brand: Genuine Mazda
• Part No.: LF01-12-114
• Also referenced as: LF0112114
• Supersedes / cross-references: 1F20-12-114 / LF02-12-114
• Designed for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 (NC) applications listed in the compatibility table

Fitment advice: Designed for the Mazda MX-5 NC variants listed in the compatibility table, covering Mk3, Mk3.5 and Mk3.75 soft-top and Roadster Coupe / PRHT models with 1.8L L8-DE and 2.0L LF-VE petrol engines. For engines that have been rebuilt, modified or previously fitted with non-standard cylinder head components, matching the original valve train layout and cotter style is recommended before assembly.

Other items to consider: When changing this part, you may also want to consider purchasing related items such as valve stem oil seals, valve springs, spring retainers, replacement valves, cam cover gasket, cylinder head gasket, head bolts, timing chain components, fresh engine oil and coolant if the cylinder head is being removed.

Useful tools / consumables: Valve spring compressor, magnetic pick-up tool, small pick or screwdriver, clean assembly tray, engine assembly lubricant, torque wrench, socket set, clean workshop towels and suitable timing tools if camshafts or timing chain components are removed.

Difficulty guide: DIY Difficulty: Advanced. Valve cotter replacement normally involves valvetrain disassembly and the use of a valve spring compressor. Correct seating of the cotters in the retainer groove is essential, as incorrect installation can cause serious engine damage.

Why Genuine Mazda? Genuine Mazda valvetrain components are designed to match the original specification of the engine. For valve cotters, this means correct taper, hardness, fit on the valve stem groove and compatibility with the Mazda spring retainer. Genuine Mazda parts help reduce the risk of incorrect locking, valve train noise, retainer movement or premature component wear.

Why buy from Mazspec? Mazspec specialises in Mazda parts and understands the details that matter when rebuilding or servicing Mazda engines. We source genuine Mazda components through trusted OE channels and can help with related cylinder head, timing chain, gasket and service parts for the job.

What’s in the box: One pair of Genuine Mazda valve spring retaining cotters.

Installation notes: Always install valve cotters clean and dry into the correct retainer/valve stem groove. After compressing and releasing the valve spring, confirm that both cotter halves are seated evenly before rotating the engine or refitting the camshaft assembly. Follow the Mazda workshop manual procedure for cylinder head and valvetrain assembly.