From 2007 until 2015, the company produced the 1.2-liter Chevrolet B12D1 or LMU engine, which was fitted to the group’s most well-liked low-cost models, including the Aveo and Spark. Both an LMH version with a lower compression ratio and a gas modification of the engine were suggested.
One of the engines with the B12D1 or LMU index according to GM classification was part of the Daewoo S-TEC engine series’ second generation of power units, which made its debut in 2007. With a cast-iron cylinder block, an aluminum 16-valve cylinder head without hydraulic lifters, a timing chain drive, distributed fuel injection, and an intake manifold with a geometry change system, this four-cylinder engine is fairly typical for its era.
A more potent version of this engine with the LL0 index was created specifically for the US market. It was identified by having phase regulators of the DCVCP type and a slightly larger displacement.
The engines in the B series are B10S1, B10D1, B12S1, B12D1, B12D2, and B15D2.
The engine was installed on:
- Chevrolet Aveo T250 in 2007 – 2011;
- Chevrolet Spark M300 in 2009 – 2015.
Specifications
| Production years | 2007-2015 |
| Displacement, cc | 1206 |
| Fuel system | distributed injection |
| Power output, hp | 84 |
| Torque output, Nm | 114 |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 69.7 |
| Piston stroke, mm | 79 |
| Compression ratio | 10.5 |
| Features | no |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.75 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Chevrolet Aveo T250 2010) — city — highway — combined |
7.2 4.6 5.5 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | – |
Disadvantages of the B12D1 engine
The most significant issue with this dependable engine is the timing chain jump caused by the hydraulic tensioner’s wear or stretching. Additionally, the valve is frequently bending. Although the chain’s official lifespan is 250,000 kilometers, it typically lasts half as long.
This motor lacks hydraulic compensators; instead, the valve clearance can be changed by choosing pushers, which requires removing the camshafts. It’s also not inexpensive. This process is frequently put off by owners, who wait until their valves burn out.
Chevrolet’s low-cost models lack the best attachments, and pump leaks, humming generator bearings, and starter failures are frequent.
They frequently complain about ignition system issues and lubricant leaks on specialized forums. Additionally, you should keep an eye on the radiators because they frequently leak and overheating is a common occurrence here.