Genuine Mazda 2.0L Exhaust Camshaft • L309-12-441A

Genuine Mazda L309-12-441A 2.0L Exhaust Camshaft

Replacement Genuine Mazda exhaust camshaft 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 camshaft is mounted within the cylinder head and operates the engine's exhaust valves. Its precisely machined cam lobes determine when each exhaust valve opens, how far it opens and when it closes, controlling the release of burned combustion gases into the exhaust ports.

The exhaust camshaft is driven by the engine's timing chain and must remain correctly synchronised with the crankshaft and inlet camshaft. Accurate camshaft timing, lobe profile and bearing-journal condition are essential for compression, exhaust flow, engine performance and reliable valvetrain operation.

Unlike the inlet camshaft, which works with the variable valve timing actuator on the LF-VE engine, the exhaust camshaft uses a fixed timing-sprocket arrangement.

This listing supplies one Genuine Mazda exhaust camshaft. One exhaust camshaft is fitted per engine.

Replacement may be required where the original camshaft lobes, bearing journals, timing surfaces or sprocket mounting features have become worn, scored or damaged. Possible symptoms include valvetrain noise, reduced performance, poor idle quality, abnormal valve clearances, camshaft timing faults or metallic contamination found in the engine oil.

• Part type: Exhaust camshaft
• Primary use: Operates the exhaust valves and controls exhaust-valve timing
• 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
• Drive type: Timing chain
• Timing arrangement: Fixed exhaust camshaft sprocket
• Quantity per engine: One
• Quantity supplied: One exhaust camshaft
• Brand: Genuine Mazda
• Part No.: L309-12-441A
• Also referenced as: L30912441A
• Engine restriction: 2.0L LF-VE only
• Not suitable for: MX-5 NC 1.8L engine
• Associated inlet camshaft: L3E3-12-420

Fitment advice: Confirm that the vehicle is fitted with the original Mazda 2.0L LF-VE engine. Compare the original camshaft identification, lobe arrangement, timing-sprocket mounting and sensor features before installation. This camshaft should not be assumed to fit the 1.8L engine.

Other items to consider: When changing this part, you may also want to consider purchasing the exhaust camshaft sprocket, camshaft bolt and washer, timing chain, chain guides, hydraulic tensioner, valve-clearance adjustment buckets, cam-cover gasket, engine oil and oil filter. Inspect the inlet camshaft and VVT actuator at the same time.

Useful tools / consumables: Mazda-compatible crankshaft and camshaft timing tools, camshaft holding tool, calibrated torque wrench, micrometer, suitable journal-clearance measuring equipment, engine assembly lubricant, clean engine oil and the specified timing-cover sealant where the front cover is removed.

Difficulty guide: DIY Difficulty: Advanced. Replacement requires removal of the cam cover and timing components, accurate locking of the crankshaft and camshafts, controlled loosening and tightening of the camshaft bearing caps and verification of valve clearances.

Why Genuine Mazda? Genuine Mazda camshafts are manufactured to the intended lobe profile, journal dimensions, surface hardness and timing relationship. Using the correct OE camshaft helps maintain accurate valve operation, correct oil clearances and compatibility with the original Mazda cylinder head, timing and valvetrain components.

What’s in the box: One Genuine Mazda exhaust camshaft, part number L309-12-441A. The timing sprocket, mounting bolt, bearing caps, valve-clearance buckets, timing chain, seals and gaskets are not included unless specifically shown or stated separately.

Installation notes: Inspect the cylinder-head bearing surfaces, camshaft journals, lobes, valve-clearance buckets, timing chain and exhaust camshaft sprocket before installation. Lubricate all journals and lobes with clean engine assembly lubricant. Retain each original camshaft bearing cap in its correct position and orientation, and tighten the caps gradually in the Mazda-specified sequence. Set the crankshaft and both camshafts to the correct timing position, verify timing-chain alignment and rotate the engine manually before starting. Check and correct valve clearances as required.