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

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

Replacement Genuine Mazda valve spring retaining collet pair for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC models with 1.8L and 2.0L petrol engines from 2005 to 2015 listed in the compatibility table.

Valve spring retaining collets—also known as valve cotters, valve locks or valve keepers—are small precision components fitted around the grooved upper section of each valve stem. The tapered collets engage with the valve spring retainer and secure the valve, spring and retainer assembly together.

Each valve uses one matched pair of collet halves. When the valve spring compressor is released, the spring retainer closes around the tapered collets and locks them securely into the groove in the valve stem.

This listing supplies one complete pair of Genuine Mazda valve collets for one valve. The Mazda MX-5 NC uses a 16-valve cylinder head, so 16 pairs are required when replacing the collets throughout one complete engine.

These parts are commonly replaced during a cylinder-head rebuild, valve replacement, valve-spring replacement or other valvetrain work. Replacement may also be necessary where an original collet has become worn, marked, distorted, damaged or lost during disassembly.

• Part type: Valve spring retaining collet / valve cotter / valve lock
• Primary use: Locks the valve spring retainer to the valve stem
• Location: Cylinder head / valvetrain
• Engine applications: Mazda MX-5 NC 1.8L L8-DE and 2.0L LF-VE
• Quantity per valve: One pair
• Quantity per 16-valve engine: 16 pairs
• Quantity supplied: One pair comprising two collet halves
• Brand: Genuine Mazda
• Part No.: LF01-12-114
• Also referenced as: LF0112114
• Related Mazda references: LF02-12-114 and 1F20-12-114
• Fitment note: Suitable for the confirmed Mazda MX-5 applications shown in the compatibility table

Fitment advice: Confirm that the engine retains the original Mazda valve, valve-stem groove and spring-retainer arrangement. Engines that have been rebuilt or fitted with non-standard valves, springs or retainers should be checked carefully to ensure that the taper and valve-stem groove match before assembly.

Other items to consider: When changing this part, you may also want to consider purchasing valve stem oil seals, valve spring retainers, valve springs, replacement inlet or exhaust valves, valve-clearance adjustment buckets, a cam-cover gasket, cylinder-head gasket, head bolts and timing-chain components where the cylinder head is being rebuilt.

Useful tools / consumables: Suitable valve spring compressor, magnetic pick-up tool, small non-damaging pick, clean assembly tray, engine assembly lubricant, socket set, calibrated torque wrench, clean workshop towels and the appropriate timing tools if the camshafts or timing components are removed.

Difficulty guide: DIY Difficulty: Advanced. Installation normally requires valvetrain disassembly and controlled compression of the valve spring. Both collet halves must seat evenly and securely in the valve-stem groove before the spring compressor is fully released.

Why Genuine Mazda? Genuine Mazda valve collets are manufactured to the intended taper, hardness, dimensions and valve-stem groove profile. Using the correct OE components helps ensure that the spring retainer locks securely to the valve and reduces the risk of retainer movement, abnormal valvetrain wear or serious internal engine damage.

What’s in the box: One pair of Genuine Mazda valve spring retaining collets, part number LF01-12-114, comprising two matching collet halves for one valve.

Installation notes: Keep all valvetrain components clean and free from debris. Position both collet halves evenly in the valve-stem groove while the spring is compressed. Release the valve spring compressor slowly and confirm that the collets seat concentrically within the spring retainer. Do not rotate or operate the engine until every installed pair has been inspected for correct engagement. Follow the applicable Mazda workshop procedure for cylinder-head and valvetrain assembly.