If you’re rebuilding a Hyundai–Kia Theta II, meet Piston 23410-2G000 KIA G4KD 2.0L 86MM STD — the quiet workhorse many independent shops keep on the shelf. I’ve seen it in commuter sedans and ride-hailing fleets; in fact, the feedback I hear most is simple: “drops in clean, seals fast.”
Why this piston matters in 2025
Engines are lasting longer, but shops are picky about ring seal and cold-start noise. The trend is toward hypereutectic Al–Si pistons with low-friction skirt coatings and tight pin-bore tolerances. The Piston 23410-2G000 KIA G4KD 2.0L 86MM STD aims squarely there—reliable, price-sane, and compliant with mainstream automotive quality systems.
Quick specs (shop-floor friendly)
| Engine | Hyundai/Kia G4KD 2.0L (Theta II) |
| Bore | 86.0 mm (STD) |
| Part numbers | 23410-2G000, 234102G000, 234102G010, 234102G020 |
| Wrist pin | ≈21 mm, full-float |
| Alloy | Hypereutectic Al–Si (≈12% Si), heat-treated |
| Skirt | Graphite/MoS2 low-friction coating |
| Ring pack | Top ≈1.2 mm, 2nd ≈1.5 mm, Oil ≈2.5 mm (real-world kits may vary) |
| Compression height | ≈30.1 mm |
| Weight | ≈320 g per piston |
Origin: 289 Heping East Road, Chang’an District, Shijiazhuang City, Hebei Province, China.
How it’s made (short version)
- Materials: Hypereutectic Al–Si melt; pins in carburized alloy steel.
- Methods: Permanent-mold casting (per ASTM B179), CNC finish, pin-bore honing, groove broach.
- Heat treatment: Stabilization for ring-land strength and thermal stability.
- Testing: CMM dimensional audit (±0.01 mm typical), hardness HB 110–130, X-ray porosity check (ASTM E155), balance per ISO 1940-1, coating thickness spot-check.
- Certs: Plant quality systems aligned to ISO 9001 and IATF 16949; ring-pack compatibility checked against OEM service data.
Applications, advantages, and customization
- Where it fits: Daily-driver G4KD sedans, fleet vehicles, light performance refreshes.
- Pros: Consistent skirt clearances, quiet cold starts, stable ring lands; many customers say oil consumption settles quickly.
- Service life: Typically 150,000–250,000 km with clean oil and OE ring gaps, to be honest, usage varies.
- Options: Oversizes (+0.25/+0.50 mm), ring formulations, dish volume tweaks for compression targets.
Vendor snapshot: what’s on the market
| Vendor | Alloy/Coating | Tolerance (bore) | Warranty | Notes |
|---|---|---|---|---|
| Genuine OEM | OE hypereutectic / Moly | ≈±0.005 mm | 12 mo. | Highest price; consistent. |
| Oujia Engine (this unit) | Hypereutectic / Graphite-MoS2 | ≈±0.01 mm | 6–12 mo. (region) | Value balance; broad availability. |
| Generic budget | Cast Al / basic graphite | ≈±0.02 mm | 3–6 mo. | Watch ring-land height and pin fit. |
Real-world notes and mini case study
A taxi fleet in Xi’an swapped in a set of Piston 23410-2G000 KIA G4KD 2.0L 86MM STD during a mid-life refresh (honed cylinders, OE rings). After 60,000 km, oil use measured ≈150 ml/1,000 km—well within expectations—and drivers reported quieter cold starts than the worn OE set. Not scientific, but telling.
Customer feedback, informally: “Pins fit snug out of the box,” “no odd scuffing on first inspection,” and, surprisingly, “less piston slap than we feared.” Always check ring end gaps against the manual, though.
Installation tips (short)
- Measure bores hot and cold; set clearance per G4KD service data.
- Verify ring gaps and orientation; lubricate pin/bore generously.
- Break-in: moderate load, varied RPM, frequent early oil changes.
References
- IATF 16949:2016 – Automotive Quality Management Systems.
- ASTM B179 – Standard Specification for Aluminum Alloys in Ingot and Molten Forms for Castings.
- Hyundai–Kia Theta II (G4KD) Engine Service Manual – Piston/ring specifications and procedures.
- ISO 1940-1 – Mechanical vibration — Balance quality requirements of rigid rotors.
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