Genuine Mazda 2.0L Exhaust Valve • LF02-12-121F

Genuine Mazda LF02-12-121F 2.0L Exhaust Valve

Replacement Genuine Mazda exhaust valve for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC models fitted with the 2.0L LF-VE petrol engine from 2005 to 2015 listed in the compatibility table.

The exhaust valve is installed within the cylinder head and controls the release of burned combustion gases from the combustion chamber into the exhaust port. It is operated by the exhaust camshaft and associated valvetrain components.

Exhaust valves operate under particularly high temperatures and mechanical loads. The valve must move freely within its guide and seal correctly against the machined valve seat to retain cylinder compression and prevent hot combustion gases from escaping during the compression and power strokes.

This listing supplies one Genuine Mazda exhaust valve. The four-cylinder 16-valve LF-VE engine uses eight exhaust valves, so eight are required when replacing the complete exhaust-valve set. The inlet and exhaust valves are different components and must not be interchanged.

Replacement may be required where the original valve is burned, bent, cracked, pitted, excessively worn or no longer seals correctly against the valve seat. Possible symptoms include low compression, misfiring, poor idle quality, reduced power, increased emissions or leakage identified during cylinder-head testing.

• Part type: Exhaust valve
• Primary use: Controls exhaust-gas flow from the combustion chamber
• Location: Cylinder head / exhaust side of the valvetrain
• Vehicle application: Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC 2.0L
• Engine application: LF-VE 2.0L petrol engine
• Quantity per cylinder: Two exhaust valves
• Quantity per engine: Eight exhaust valves
• Quantity supplied: One exhaust valve
• Brand: Genuine Mazda
• Part No.: LF02-12-121F
• Also referenced as: LF0212121F
• Engine restriction: 2.0L LF-VE only
• Important note: The inlet and exhaust valves are separate components and are not interchangeable

Fitment advice: Confirm that the vehicle is fitted with the original Mazda 2.0L LF-VE engine. Compare the replacement valve with the original component before assembly. Cylinder heads previously rebuilt with non-standard valves, guides, seats or upgraded valvetrain components should be measured carefully before parts are ordered.

Other items to consider: When replacing this part, you may also want to consider purchasing valve stem oil seals, valve guides, valve springs, upper spring retainers, valve collets, inlet valves, valve-clearance adjustment buckets, a cam-cover gasket, cylinder-head gasket, head bolts and timing-chain components.

Useful tools / consumables: Valve spring compressor, valve-guide measuring equipment, micrometer, dial gauge, valve-seat testing equipment, valve-lapping tools where appropriate, engine assembly lubricant, calibrated torque wrench and Mazda-compatible camshaft and timing tools.

Difficulty guide: DIY Difficulty: Advanced / Engine Reconditioning. Replacement requires cylinder-head and valvetrain dismantling. Valve-guide clearance, valve-seat contact, valve installed height and sealing must be measured and corrected as necessary before the engine is reassembled.

Why Genuine Mazda? Genuine Mazda exhaust valves are manufactured to the intended stem diameter, overall length, valve-head profile, seat angle, material specification and heat-resistance requirements. Using the correct OE valve helps retain reliable sealing, correct valvetrain geometry and compatibility with the original Mazda valve guide, seat, spring and retaining components.

What’s in the box: One Genuine Mazda exhaust valve, part number LF02-12-121F. The valve stem oil seal, spring, retainer, collets and other cylinder-head components are not included.

Installation notes: Inspect and measure the valve guide, valve seat and adjoining valvetrain components before installation. Confirm the valve seating pattern and valve-to-guide clearance, and carry out any required cylinder-head machining using suitable specialist equipment. Lubricate the valve stem during assembly, install a new valve stem oil seal and follow the applicable Mazda workshop procedure for valve-clearance checks, camshaft timing and cylinder-head assembly.