RIDEX Valve / Rocker Cover Gasket – MX-5 NA/NB 1.6 • 321G0005

RIDEX 321G0005 Valve / Rocker Cover Gasket – MX-5 NA/NB 1.6

Replacement RIDEX rocker-cover / valve-cover / cam-cover gasket for Mazda MX-5 Mk1/NA and Mk2/NB / Mk2.5/NB-FL models with the 1.6-litre petrol engine.

The gasket seals the joint between the cylinder head and rocker / cam cover, retaining engine oil within the upper cylinder-head area and preventing oil leakage around the perimeter of the cover.

Engine restriction: MazSpec specifically identifies 321G0005 for 1.6-litre MX-5 engines. The 1.8-litre NA and NB engines use a different rocker-cover gasket and should not be allocated to this SKU. MazSpec states compatibility with all 1.6 engines found in the Mk1/NA and Mk2/NB range, including Mk2.5 facelift vehicles. :contentReference[oaicite:0]{index=0}

Typical signs of a deteriorated rocker-cover gasket include oil seepage around the cover, oil collecting on the cylinder head, burning-oil smells where leakage reaches hot components, or hardened and flattened gasket material when the cover is removed.

• Part type: Rocker-cover / valve-cover / cam-cover gasket
• Installation position: Cylinder head to rocker / cam cover
• Gasket type: Flexible rubber
• Engine application: Mazda MX-5 1.6 petrol
• EAN: 4059191210534
• Quantity supplied: 1 gasket
• Brand: RIDEX
• Part No.: 321G0005

Fitment advice: The RIDEX catalogue explicitly lists the early Mk1/NA 1.6 and the Mk2/NB 1.6, while MazSpec's MX-5-specific listing broadens this to all NA/NB 1.6 engines including the Mk2.5 facelift. AUTODOC additionally summarises the exact SKU across 1.6 MX-5 applications from 1990–2005 with 90–115 hp. :contentReference[oaicite:1]{index=1}

Common replacement reasons: Oil leakage, hardened or flattened gasket material, rocker-cover removal for servicing, valve-train inspection, timing work or replacement during wider cylinder-head repairs.

Other items to consider: Inspect the rocker cover, breather / crankcase ventilation system, spark-plug wells, ignition leads or coils and nearby oil seals. Excess crankcase pressure can contribute to repeated gasket leakage.

Useful tools / consumables: Socket and ratchet set, low-range torque wrench, non-damaging gasket-removal tools, suitable cleaning solvent and any sealant specifically required at designated joint transitions by the applicable Mazda workshop procedure.

Difficulty guide: DIY Difficulty: Easy to Moderate. Correct gasket positioning, clean sealing surfaces and accurate low-torque tightening are important to prevent leaks or damage to the rocker cover.

Why RIDEX? RIDEX engine-sealing components provide a cost-effective aftermarket replacement for OE-equivalent applications. This gasket uses a flexible rubber construction suited to the intended Mazda 1.6 rocker-cover application. :contentReference[oaicite:2]{index=2}

What’s in the box: One RIDEX 321G0005 rocker-cover gasket. Rocker cover, fasteners, sealant and installation tools are not included.

Installation notes: Allow the engine to cool before dismantling. Remove the rocker cover carefully and clean the gasket groove and cylinder-head mating surface without scratching them. Inspect the cover for distortion or damage, install the replacement gasket correctly and use sealant only where specified by Mazda. Tighten the cover fasteners gradually and evenly to the applicable torque specification, then inspect for oil leakage after the engine has reached operating temperature.