Here's an in depth tear-down of the infamous Hyundai / Kia Theta II engine and how it works.


The Hyundai Theta II engine is a 4 cylinder dual overhead cam engine. Engine failures are common from 2011-2014 and newer vehicles. This is due to debris being left inside the engine after machining the components before assembly. The metal particles would circulate inside the engine's oil lubrication system, eventually starving critical components of oil, causing it to seize up. In addition, it could also be an abrasive to bearing surfaces, causing them to wear down prematurely, creating engine knock.


Hyundai issued a recall on these engines due to the fact that it may suddenly consume all oil and stop running, even during operation. In this video, we tear down a 2012 Hyundai Sonata 2.4L 4 cylinder engine that suffered from this failure and examine worn components that caused it to fail. The engine suffered from oil starvation on the first connecting rod bearing, causing it to overheat, shred the connecting rod bearing and seize up. The unfortunate fix is to rebuild the bottom half of the engine, including the block, crankshaft, connecting rods and clean out any particles from the lubrication system that may have damaged other components.


The gasoline direct injection system is also known to cause issues, such as fuel leaks from the high pressure fuel pump causing engine fires, and carbon buildup on the intake valve.



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Oil Filter Wrench:
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3/8" Ratchet set:
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