Here's why Toyota Engines Fail

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In this video we teardown Toyota’s famous 2.4L 2AZ-FE 4 cylinder engine to see what’s inside and how it works. It features dual overhead camshafts with variable valve timing on the intake side, port injection, an all-aluminum construction, timing chain and balance shaft. However, these engines suffered from two major flaws that you should look out for if shopping for one of the many vehicles (Camry, Rav4, Scion tC, Corolla, Matrix, etc) that these engines were offered in.

The first common trait is that these engines burn excessive oil. They were redesigned for 2007 and burned even more oil due to clogged oil control rings and oil return holes that were too small in the piston head. Toyota addressed this with a new piston design (along with an engine rebuild) if the engine consumed too much oil.

The second major flaw affecting earlier engines was the rear three head bolts were not threaded down enough causing them to strip out. This would lead to a loss of compression, coolant leak, overheating, eventually causing warping of the head. Helicoil kits exist in the aftermarket to correct this issue.

The engine in this video is from a 2008 Toyota Camry that suffered significant oil loss. The connecting rod bearings overheated and seized up and was completely destroyed and missing upon disassembly. The metal particles traveled through the lubrication system and scored up other bearing surfaces of the balance shaft, connecting rods, main bearings and camshafts throughout.

Skip to section in the video:

0:00 Introduction
1:46 Teardown
13:33 Analysis
21:59 Conclusion

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