RIDEX Valve Stem Oil Seal Set – MX-5 Mk3 NC 1.8 & 2.0 • 323S0006

RIDEX 323S0006 Valve Stem Oil Seal Set – MX-5 Mk3 NC 1.8 & 2.0

Complete replacement RIDEX valve stem seal set for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 NC 1.8 and 2.0-litre petrol engines.

The kit contains 16 valve stem seals in total, covering both inlet and exhaust valves. MazSpec specifically confirms this set for all 1.8 and 2.0 MX-5 NC engines. :contentReference[oaicite:0]{index=0}

Valve stem seals control the small amount of engine oil permitted between each valve stem and valve guide. Worn seals can allow excessive oil into the combustion chambers, contributing to oil consumption, blue exhaust smoke and spark-plug fouling.

• Part type: Valve stem oil seal set
• Quantity: 16 seals
• Application: Inlet and exhaust valves
• Height: 17.8 mm
• Outer diameter 1: 14.7 mm
• Outer diameter 2: 25.3 mm
• Inner diameter 1: 4.7 mm
• Inner diameter 2: 11.2 mm
• Approximate weight: 0.128 kg
• EAN: 4064138101837
• Brand: RIDEX
• Part No.: 323S0006

MX-5 fitment: Confirmed for all Mazda MX-5 Mk3/NC 1.8 and 2.0 engines from 2005 through 2014, including Mk3.5 and Mk3.75 facelift models. The complete set provides the required 16 seals for the four-cylinder, 16-valve engine. :contentReference[oaicite:1]{index=1}

Common replacement reasons: Blue exhaust smoke after start-up or extended overrun, excessive oil consumption, oil-fouled spark plugs, hardened valve stem seals or replacement during cylinder-head / valve-train overhaul.

Diagnosis advice: Excessive oil consumption can also result from piston-ring wear, PCV-system faults or other engine problems. Correct diagnosis is recommended before assuming valve stem seals are the sole cause.

Other items to consider: Inspect valve guides, valve springs and retainers, camshaft components, rocker / cam-cover gasket, timing-chain components, spark plugs and crankcase ventilation system while carrying out the repair.

Useful tools / consumables: Valve spring compressor, suitable valve-holding method, torque wrench, engine timing tools, seal installation tool, magnetic pick-up tool, clean engine oil and appropriate replacement gaskets / sealant required during reassembly.

Difficulty guide: DIY Difficulty: Advanced / Professional. Replacement requires substantial valve-train dismantling and correct engine timing procedures. Incorrect assembly can result in serious engine damage.

Why RIDEX? RIDEX engine-sealing components provide a cost-effective aftermarket replacement manufactured to application-specific dimensions. This complete 16-piece kit services both inlet and exhaust valves rather than requiring the seals to be purchased individually.

What’s in the box: Sixteen RIDEX valve stem oil seals – a complete set for one supported 16-valve engine.

Installation notes: Follow the applicable Mazda workshop procedure for valve-train dismantling and timing. Prevent valves from dropping into the cylinders when removing springs and retainers. Remove old seals carefully without damaging the valve stems or guides, lubricate the new seals appropriately and press them squarely into position using a suitable installation tool. Reassemble the valve train and timing system to Mazda specifications and verify correct timing before starting the engine.