Timing system failure is the single most expensive engine repair for Hyundai and Kia vehicles. A snapped timing belt or stretched chain can cause valve-piston contact, destroying the cylinder head and requiring a complete engine rebuild. For importers and wholesalers serving independent garages, timing kits are a high-trust, high-margin category — customers buy based on reputation, not price. This guide covers the full Hyundai-Kia timing system: chains vs belts by engine family, tensioner failure symptoms, complete OE number tables with FOB pricing, and regional demand analysis for the most timing-sensitive markets.
In This Guide
Chain vs Belt: Engine Family Quick Reference
| Engine Family | Displacement | Timing Type | Replacement Interval | Key Models |
|---|---|---|---|---|
| Theta II | 2.0T / 2.4 GDI | Chain | 150,000-200,000 km | Sonata, Optima, Santa Fe, Sportage, Sorento, Tucson |
| Gamma | 1.6 GDI / 1.6T | Chain | 150,000-200,000 km | Elantra, Kona, Veloster, Soul, Rio |
| Nu | 1.8 / 2.0 MPI | Chain | 150,000-200,000 km | Elantra, Forte, Soul, Tucson |
| Beta II | 2.0L | Belt | 90,000-100,000 km | Elantra XD/HD, Tucson JM |
| D4CB / R-series | 2.5L / 2.2L Diesel | Chain | 200,000-250,000 km | Starex/H-1, Santa Fe Diesel, Sorento Diesel |
Timing Chain Kits & Components
Timing chains are designed to last the life of the engine, but in practice, chain stretch and tensioner failure occur between 150,000-200,000 km — especially on Theta II engines where oil change neglect accelerates timing component wear. A complete timing chain kit includes: timing chain, crankshaft sprocket, camshaft sprockets (2), chain tensioner, guide rails (2-3), and gaskets/seals.
| OE Kit Number | Engine Application | Kit Contents | FOB USD |
|---|---|---|---|
| 24321-2GTA0 | Theta II 2.0T GDI (Sonata/Optima) | Chain + 2 sprockets + tensioner + 3 guides + gaskets | $138.00 |
| 24321-2E000 | Theta II 2.4 GDI (Santa Fe/Sorento) | Chain + 2 sprockets + tensioner + 3 guides + gaskets | $145.00 |
| 24321-2B000 | Gamma 1.6 GDI (Elantra AD/Kona) | Chain + 2 sprockets + tensioner + 2 guides | $122.00 |
| 24321-2B500 | Gamma 1.6T GDI (Tucson/Sportage) | Chain + 2 sprockets + tensioner + 3 guides + gaskets | $142.00 |
| 24321-4H000 | Nu 2.0 MPI (Elantra/Forte) | Chain + 2 sprockets + tensioner + 2 guides | $118.00 |
| 24321-4A600 | R 2.2L Diesel (Santa Fe/Sorento) | Chain + 2 sprockets + tensioner + 3 guides | $168.00 |
Timing Belt Kits & Water Pump Bundles
Timing belt engines (Beta II, pre-2012 Theta, early Gamma) require replacement every 90,000-100,000 km. The industry standard is to bundle the water pump replacement with the timing belt job since the labor to access the water pump is the same. This creates a natural upsell opportunity for wholesalers: sell the timing belt kit + water pump as a bundled package.
| OE Kit Number | Engine Application | Kit Contents | FOB USD |
|---|---|---|---|
| 24312-23000 | Beta II 2.0L (Elantra XD/HD) | Belt + tensioner + idler | $48.00 |
| 24312-23700 + 25100-23000 | Beta II 2.0L belt + water pump bundle | Belt + tensioner + idler + water pump + gasket | $68.00 |
| 24312-2E000 | Theta 2.0L (Sonata NF) | Belt + tensioner + idler | $52.00 |
| 24312-2E000 + 25100-2E000 | Theta 2.0L belt + water pump bundle | Belt + tensioner + idler + water pump + gasket | $74.00 |
| 24312-26000 | Kia 2.0L (Sportage KM) | Belt + tensioner + idler | $50.00 |
Tensioners, Guide Rails & VVT Components
Tensioner failure is the most common timing system problem — more frequent than chain stretch itself. A failed tensioner allows the chain to slap against the guide rails, wearing through the plastic and eventually allowing the chain to jump teeth. VVT (Variable Valve Timing) actuators and oil control valves (OCV) can also fail, causing P0011/P0014 timing codes.
| OE Part Number | Part Description | Application | FOB USD |
|---|---|---|---|
| 24370-2GTA0 | Timing chain tensioner | Theta II 2.0T | $35.00 |
| 24420-2GTA0 | Chain guide rail (upper) | Theta II 2.0T | $18.00 |
| 24430-2GTA0 | Chain guide rail (lower) | Theta II 2.0T | $15.00 |
| 24355-2GTA0 | VVT intake actuator (CVVT) | Theta II 2.0T/2.4 | $58.00 |
| 24375-2GTA0 | VVT exhaust actuator (CVVT) | Theta II 2.0T/2.4 | $58.00 |
| 24355-2B000 | OCV (Oil Control Valve) intake | Gamma 1.6 GDI | $32.00 |
Container Strategy & FOB Summary
| SKU Category | Qty | Unit FOB | Line Total |
|---|---|---|---|
| Timing chain kits (Theta II 2.0T/2.4) | 80 kits | $138-145 | $11,320 |
| Timing chain kits (Gamma/Nu) | 100 kits | $118-122 | $12,000 |
| Timing belt + water pump bundles | 150 bundles | $68-74 | $10,650 |
| Individual tensioners | 200 pcs | $35 | $7,000 |
| VVT actuators + OCV | 150 pcs | $32-58 | $6,750 |
| TOTAL FULL CONTAINER (40HQ) | 680 kits/pcs | — | $47,720 |
Recommended first order: 30x Theta II chain kits + 30x Gamma/Nu chain kits + 40x belt+water pump bundles + 50x tensioners = 20ft container at ~$21,000 FOB. This mix covers the three most common timing system jobs in any Hyundai-Kia garage and provides a balanced margin structure.
PAA FAQ: Timing System Expert Answers
Q: How much does timing chain replacement cost on a Hyundai?
A complete timing chain kit (chain + sprockets + tensioner + guides + gaskets) costs $118-145 FOB from Kingmay for OEM-grade. Labor varies by market: $150-300 in African garages, $300-500 in Gulf markets. Total job: $270-645. This is significantly cheaper than a timing chain failure, which causes $2,500-4,500 in engine damage. Never replace just the chain without the tensioner and guides — the old tensioner will cause the new chain to stretch prematurely.
Q: Timing chain vs timing belt — which is better?
Timing chains are more durable (150,000-200,000 km life) but noisier, heavier, and more expensive to replace. Timing belts are quieter and lighter but require regular replacement (90,000-100,000 km). For Hyundai-Kia, all modern engines (Theta II, Gamma, Nu) use chains. Only older engines (Beta II, pre-2012 Theta) use belts. For importers, chain kits generate higher per-unit revenue ($118-168 vs $48-74), while belt kits generate repeat purchases through the water pump bundle strategy.
Q: What are the symptoms of timing chain tensioner failure?
Early signs: (1) Rattling noise from the timing cover on cold start — lasts 1-3 seconds until oil pressure builds; (2) Check Engine Light with P0011/P0014 (camshaft timing over-advanced/retarded); (3) Rough idle and power loss at low RPM; (4) Metallic ticking that gets louder with RPM. If you hear rattling on cold start, replace the tensioner immediately — this is the #1 warning sign. Waiting will result in chain jump and engine destruction.
Q: How often should the timing belt be changed?
Hyundai-Kia specifies 90,000-100,000 km or 6 years (whichever comes first) for timing belt replacement on Beta II and early Theta engines. In hot climates (Middle East, Africa), reduce to 80,000 km or 5 years due to accelerated rubber aging. Always replace the water pump simultaneously — the labor is the same and the water pump is the same age as the belt. A $20 water pump added to a timing job is the most cost-effective preventive maintenance a customer can get.
Q: Can I replace just the timing chain without the sprockets?
No — this is a common mistake. A worn sprocket will cause a new chain to wear unevenly, leading to premature stretch and the same failure within 30,000-50,000 km. The chain and sprockets wear together as a matched set. Kingmay's complete timing kits include all sprockets, tensioner, and guide rails for this reason. Selling a chain-only repair is a short-term fix that damages your reputation as a quality supplier. Always sell the complete kit.
Q: What is the HS code for timing system auto parts?
Timing chains: HS 7315.11 (roller chain of iron or steel). Timing belts: HS 4010.39 (endless transmission belts). Tensioners and guide rails: HS 8409.91 (parts for spark-ignition engines). VVT actuators: HS 8409.91. Import duties: Nigeria 10-20%, Kenya 10-25%, UAE 5%, Saudi Arabia 5-12%, Egypt 10-30% (varies). Always confirm with your destination broker.
Kingmay Auto Parts — OEM-grade timing system components with IATF 16949 verified supply chain. 30,000+ Hyundai-Kia SKUs. 13 years export to 40+ countries. Contact Miss UU: ku@kingmay-autoparts.com, WhatsApp +86 13302408528, Shop 7# No.1542 Guangyuan E Rd, Yuexiu, Guangzhou.
Find Timing Parts by Vehicle →
Kingmay Auto Parts Wholesale Overview →
Verify Part Numbers in Our OE Library
Every part covered in this guide has a matching OE number in our reference library — grouped by system with cross-references, so you can source the exact fit for Hyundai, Kia, GM Korea and more.
Related Articles
Related Products
From our Auto Parts catalog — 4 export-ready products
