Description
Overview:
This Rocker Cover Gasket is a Genuine Honda part designed to seal the cylinder head cover on Honda petrol engines, keeping engine oil contained and contaminants out. Made from a heat- and oil-resistant elastomer, it maintains a reliable seal under vibration and temperature changes. It is a direct-fit replacement for worn or flattened gaskets on popular Honda GX-series engines used in construction and garden machinery, such as the GX240 and GX390. Correct sealing helps prevent oil leaks, supports stable crankcase ventilation, and maintains engine cleanliness, which in turn supports performance and service life. Supplied to Honda OEM specification, this gasket is suitable for routine maintenance or repairs where the rocker/valve cover has been removed for valve clearance checks or other top-end servicing.
Key Features:
- Genuine Honda part for assured fit and compatibility (ref: 12391-ZE2-020 / 12391ZE2020)
- Oil- and heat-resistant elastomer material for long service life
- Maintains a consistent seal under engine vibration and thermal cycling
- Helps prevent oil leaks, misting and dirt ingress around the rocker/valve cover
- Manufactured to OEM standards for reliable performance and durability
- Simple, like-for-like replacement with no modifications required
- Supports cleaner running and reduced maintenance caused by oil seepage
- Suitable for regular service intervals where the cover is removed for valve adjustment
- Ideal for a wide range of GX-series engines used across site, garden and agricultural equipment
Typical Applications:
Used on Honda GX engines fitted to generators, water pumps, pressure washers, plate compactors, cement mixers, tillers and similar equipment. Replaces a hardened, damaged or leaking gasket during valve clearance checks, top-end inspections or when refurbishing engines. Helps keep engines clean, reduces oil smells and staining, and supports reliable operation in demanding site or outdoor conditions.
Also known as:
Valve cover gasket, cylinder head cover gasket, cam cover gasket, rocker box gasket, tappet cover gasket, engine rocker lid seal, head cover seal.
Fits Models:
EC5000, GX240, GX240K1, GX240U1, GX240UT1, GX240UT2, GX270, GX270H, GX270T, GX270T2, GX270U, GX270UT, GX270UT2, GX340, GX340K1, GX340T1, GX340T2, GX340U1, GX340UT1, GX390, GX390H1, GX390K1, GX390T1, GX390T2, GX390U1, GX390UT1, GX390UT2, GX610U1, GX620U1, GX670, GX690, GXV670, GXV670U
Alternate Part Numbers:
12391-ZE2-020, 12391ZE2020
Product Specifications
| L&S Part No. | 12391 ZE2 020 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Honda |
| OEM No. | 12391ZE2020 |
| Unit of Sale | 1 |
| Applications | EC5000, GX240, GX240K1, GX240U1, GX240UT1, GX240UT2, GX270, GX270H, GX270T, GX270T2, GX270U, GX270UT, GX270UT2, GX340, GX340K1, GX340T1, GX340T2, GX340U1, GX340UT1, GX390, GX390H1, GX390K1, GX390T1, GX390T2, GX390U1, GX390UT1, GX390UT2, GX610U1, GX620U1, GX670, GX690, GXV670, GXV670U |
| Machine Type | Engines |
| Fits Brands | Honda |
| Fits Models | GX340K1 (GC05) | GX340U1 (GCAMK) | GX340UT1 (GCAVT) | GX340T1 (GCAWT) | GX340T2 (GCBFT) | GX340K1 (GDAE) | GX270 (GCAB) | GX270 (GDAD) | GX270H (GCADH) | GX240K1 (GC04) | GX270T (GCADT) | GX270UT (GCAJT) | GX270U (GCALK) | GX270UT2 (GCBGT) | GX240U1 (GCAKK) | GX270T2 (GCBHT) | GX240UT1 (GCATT) | GX390K1 (GDAF) | GX390T1 (GCAET) | GX390H1 (GCAFH) | GX390UT1 (GCAKT) | GX390U1 (GCANK) | GX390UT2 (GCBCT) | GX240UT2 (GCBJT) | GX390T2 (GCBDT) | GX240K1 (GDAC) | GX390K1 (GCAA) | GX610U1 (GCAPK) | GX620U1 (GCARK) | GX670 (GCAM) | GX690 (GDACK) | GXV670 (GJAH) | GXV670U (GJAHK) | EC5000 |
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