Engine GM LLR

The 3.7-liter General Motors LLR engine was assembled at a plant in America from 2006 to 2012 and installed on GMT345 / 355 platform models such as the Chevrolet Colorado and Hummer H3. This inline 5-cylinder engine is distinguished by enviable reliability, but its consumption is high.

The Atlas family: LLV, LLR, LL8.


Production years 2006-2012
Displacement, cc 3653
Fuel system distributed injection
Power output, hp 242
Torque output, Nm 328
Cylinder block aluminum R5
Block head aluminum 20v
Cylinder bore, mm 95.5
Piston stroke, mm 102
Compression ratio 10.0
Features DOHC
Hydraulic lifters yes
Timing drive chain
Phase regulator at the exhaust
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 5.7
Fuel type petrol
Euro standards EURO 3
Fuel consumption, L/100 km (for Hummer H3 2007)
— city
— highway
— combined
Engine lifespan, km ~400 000
Weight, kg 191

The engine was installed on:

  • Chevrolet Colorado 1 (GMT355) in 2006 – 2012;
  • GMC Canyon 1 (GMT355) in 2006 – 2012;
  • Hummer H3 (GMT345) in 2006 – 2010.

Disadvantages of the GM LLR engine

  • This is a completely reliable and resource unit, but its consumption is not the smallest.
  • At high mileage, valve seat wear and chain stretch are common.
  • Many complaints are related to the low resource of the water pump and viscous fan coupling.
  • It is important to monitor their condition, as aluminum motors do not tolerate overheating.
  • And here the rear crankshaft oil seal often flows and the exhaust manifold bursts.

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