Applicable Engine:
G4HG / G4HC
Applicable Brand:
HYUNDAI / KIA
Applicable Car:
ATOS / I10 / VISTO
Product parameters:
| Displacement | Fuel | Cylinder | Vale | Camshaft | Year |
| 1.0 | Gasoline | 4 | 12 | 1 |
Cylinder Head
Cylinder Head Hyundai Atos G4HC G4HG Engines
Introduction
Product NO.
| ML NO. | OEM NO. | REF NO. |
| MLG115 | 22100-02766 22100-02757 |
Product Information Cylinder Head
1.0L / 1.1L MPI | SOHC | Inline-4 | 8-Valve | Gasoline
1. Engine Overview
| Engine Code | Displacement | Valvetrain | Valves | Fuel Type | Notes |
|---|---|---|---|---|---|
| G4HC | 1.0L (999 cc) | SOHC | 8V | Gasoline (MPI) | Early Atos / Santro engine |
| G4HG | 1.1L (1086 cc) | SOHC | 8V | Gasoline (MPI) | Updated version of G4HC |
These engines belong to Hyundai’s Epsilon family, known for reliability, simplicity, and compact size—perfect for city cars.
2. Cylinder Head Technical Specifications
| Specification | Details |
|---|---|
| Configuration | Inline 4-cylinder |
| Cylinder Head Material | Aluminum Alloy |
| Valvetrain | SOHC (Single Overhead Camshaft) |
| Valves | 8 (2 per cylinder) |
| Camshaft Drive | Timing Belt |
| Cooling System | Water-cooled |
| Fuel System | Multi-point Fuel Injection (MPI) |
| Ignition | Distributor or coil pack (depending on year) |
3. Compatible Vehicles
| Make | Model(s) | Engine Code | Years |
|---|---|---|---|
| Hyundai | Atos (MX, Prime) | G4HC | 1998–2003 |
| Hyundai | Atos Prime / Santro Xing | G4HG | 2003–2013 |
| Hyundai | i10 (1st gen, some markets) | G4HG | 2007–2013 |
| Kia | Visto | G4HC / G4HG | 2000–2004 |
Note: In some regions (India, Southeast Asia, Latin America), G4HG replaced G4HC with slight ECU/fuel system changes but used the same cylinder head design.
4. OEM Part Numbers (Sample)
| Description | Part Number Examples |
|---|---|
| Bare Cylinder Head | 22100-02700, 22100-02710, 22100-02A00 |
| Cylinder Head Assembly | 22100-02A01, 22100-02A02 (with cam/valves) |
| Gasket Set | 20910-02701, 20910-02A01 |
Exact part number may vary based on production year and ECU calibration (EURO II/III compliance).
5. Common Cylinder Head Problems
| Issue | Cause | Remedy |
|---|---|---|
| Overheating damage | Poor coolant flow / head gasket failure | Pressure test / resurface or replace |
| Valve stem seal wear | Oil burning on startup | Replace seals, inspect guides |
| Camshaft wear | Poor oil maintenance | Replace camshaft, check oil flow |
| Cracked head (rare) | Severe overheating | Replace head |
6. Main Export Markets
These cylinder heads are popular in:
- India (Santro Xing, Atos Prime – taxi and private use)
- Philippines, Indonesia, Vietnam
- South Africa
- Middle East (UAE, Egypt, Iran)
- South America (Chile, Colombia, Ecuador)
High demand in countries where Atos/Santro was sold as an affordable compact city car with a long service life.