Why the Toyota 2ZR Engine was a Failure
Here's a look inside the Toyota 2ZR-FXE engine and how it works!
The Toyota 2ZR engine is a 1.8L 4 cylinder all aluminum engine. The FXE variant was used in the Toyota Prius and Lexus CT200h variant. These engines were known for overheating due to headgasket failures and oil burning causing carbon buildup.
The engine features dual overhead cams with variable valve timing only on the intake side. It has an electric water pump that operates when the vehicle is using electric traction power only, since there are other systems that need to be cooled when the engine is off. Typically, the heat cycling of the hybrid system is what attenuates the head-gasket failures on these engines.
The rest of the engine has a very simple design with port injection, a simple timing chain setup, and hydraulic roller-lifter system for the camshafts.
The use of low tension oil control rings for lower friction has also been attributed to the oil burning issues. Carbon builds up and cannot pass through the very thin rings and as a result, the oil ends up on top of the piston getting burnt through the exhaust as opposed to going back into the sump.
The engine in this video was from a 2012 Lexus CT200h with 290,000km.
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