Genuine Mazda 2.0L Variable Valve Timing Actuator / VVT • LF94-12-4X0C

Genuine Mazda LF94-12-4X0C 2.0L Variable Valve Timing Actuator / VVT

Replacement Genuine Mazda variable valve timing actuator for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC models fitted with the 2.0L LF-VE petrol engine from 2005/2006 to 2015 listed in the compatibility table.

Also known as a VVT actuator, camshaft phaser or variable camshaft sprocket, this component mounts to the inlet camshaft and is driven by the engine's timing chain.

Controlled engine-oil pressure alters the actuator's internal position, advancing or retarding the inlet camshaft relative to the crankshaft. This allows the engine-management system to adjust inlet-valve timing according to engine speed, load, temperature and other operating conditions.

Correct VVT operation supports stable idle, responsive low-speed torque, higher-speed performance, fuel efficiency and emissions control. The actuator must also maintain accurate mechanical engagement with the timing chain and inlet camshaft.

This listing supplies one Genuine Mazda variable valve timing actuator. One LF94-12-4X0C actuator is fitted per applicable 2.0L engine.

Replacement may be required where the original actuator develops internal wear, fails to hold its commanded position or becomes damaged during timing-system or camshaft repairs. Possible symptoms include a rattling noise from the timing-chain area, particularly during start-up, unstable idle, reduced performance, increased fuel consumption, engine-management fault codes or incorrect inlet camshaft timing.

• Part type: Variable valve timing actuator / VVT actuator
• Alternative descriptions: Camshaft phaser, variable camshaft sprocket and VVT camshaft gear
• Primary use: Advances or retards the inlet camshaft relative to the crankshaft
• Location: Inlet camshaft / timing-chain assembly
• Vehicle application: Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC 2.0L
• Engine application: LF-VE 2.0L petrol engine
• Valve timing system: Mazda intake-side variable valve timing / S-VT
• Drive type: Timing chain
• Quantity per engine: One
• Quantity supplied: One VVT actuator
• Brand: Genuine Mazda
• Part No.: LF94-12-4X0C
• Also referenced as: LF94124X0C
• Engine restriction: 2.0L LF-VE only
• Not suitable for: MX-5 NC 1.8L models

Fitment advice: Confirm that the vehicle is fitted with the original Mazda 2.0L LF-VE engine. Compare the original actuator number, timing-chain tooth arrangement, inlet-camshaft mounting and oil-control configuration before installation. The final C revision suffix forms part of the complete part number and should not be omitted.

Other items to consider: When changing this part, you may also want to consider purchasing the timing chain, chain guides, hydraulic chain tensioner, VVT oil-control valve, inlet camshaft, camshaft mounting bolt and washer, cam-cover gasket, timing-cover sealant, engine oil and oil filter.

Useful tools / consumables: Mazda-compatible crankshaft and camshaft timing tools, camshaft holding tool, crankshaft pulley holding tool, socket set, breaker bar, calibrated torque wrench, engine assembly lubricant, clean engine oil and Mazda-specified timing-cover sealant where the front cover is removed.

Difficulty guide: DIY Difficulty: Advanced. Replacement requires accurate locking of the crankshaft and camshafts, timing-chain dismantling and correct actuator positioning. Incorrect valve timing can cause poor running, engine-management faults or serious internal engine damage.

Why Genuine Mazda? Genuine Mazda VVT actuators are manufactured to the intended tooth profile, internal phasing range, locking mechanism, oil-pressure control characteristics and camshaft mounting dimensions. Using the correct OE component helps maintain accurate inlet-camshaft control and compatibility with the original Mazda timing chain, camshaft and engine-management system.

What’s in the box: One Genuine Mazda variable valve timing actuator / inlet camshaft phaser, part number LF94-12-4X0C. The inlet camshaft, mounting bolt, timing chain, guides, tensioner, oil-control valve, seals and gaskets are not included unless specifically shown or stated separately.

Installation notes: Set and lock the crankshaft and camshafts in the correct timing position before dismantling the timing system. Inspect the timing chain, guides, tensioner, inlet camshaft, oil-control valve and engine-oil passages before fitting the replacement actuator. Prime moving surfaces with clean engine oil, install the actuator in the correct orientation and tighten all fasteners in accordance with the applicable Mazda workshop procedure. Rotate the engine manually through at least two complete crankshaft revolutions and recheck the timing alignment before starting the engine.