From 2002 to 2011, the 1.2-liter Chevrolet B12S1 or LY4 engine was manufactured in South Korea and fitted to a number of the company’s well-known low-cost models, including the Aveo and Kalos. In several sources, this power unit is listed under the entirely different index F12S3.
The Daewoo S-TEC engine series of gasoline-powered vehicles received a 1.2-liter engine in 2002. With distributed fuel injection, a cast-iron cylinder block, an aluminum eight-valve head, and a timing belt drive, it was the most popular engine available at the time. The manufacturer added an EGR valve to this unit in order to comply with Euro 3 eco-standards. This location lacks hydraulic compensators, and the valve needs to be adjusted every 30,000 kilometers.
The engines in the B series are B10S1, B10D1, B12S1, B12D1, B12D2, and B15D2.
The engine was installed on:
- Chevrolet Aveo T200 in 2004 – 2008;
- Chevrolet Aveo T250 in 2008 – 2011;
- Daewoo Kalos T200 in 2002 – 2006.
Specifications
| Production years | 2002-2011 |
| Displacement, cc | 1150 |
| Fuel system | distributed injection |
| Power output, hp | 72 |
| Torque output, Nm | 104 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 8v |
| Cylinder bore, mm | 68.5 |
| Piston stroke, mm | 78 |
| Compression ratio | 9.3 |
| Features | no |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.2 |
| Fuel type | petrol |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Chevrolet Aveo T200 2006) — city — highway — combined |
8.4 5.5 6.6 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | – |
Disadvantages of the B12S1 engine
The too-narrow oil channel jet that provides lubricant to the block head is this unit’s most well-known issue. Deposits quickly clog it, and a lack of oil causes the camshaft and rocker to deteriorate. All you have to do is drill it out.
The crankcase ventilation valve is another vulnerability in this situation. Due to wear, it may jam in the closed position and cause oil leaks right away, or it may jam in the open position and cause air leaks and floating speed.
Owners of vehicles with these engines frequently lament attachment failures: the generator bearings buzz, the pump flows, the thermostat sticks, and the starter fails.
The fuel injectors clog, the throttle servo teeth crumble, and the ignition coil and its high-voltage wires only last a short while.