In this video we tear down a Subaru Boxer 2.0L turbocharged engine to see what's inside and how it works! We also examine some of the common failure points on these engines and what to look out for if you are looking for a vehicle with a boxer engine.The Subaru engine in this video was from an early 2000's Impreza WRX with an EJ20 engine. A boxer 4 cylinder engine has pairs of pistons that are horizontally opposed, lending for good engine balance and a low center of gravity. The disadvantages are that the lubrication system takes a longer time to drain back to the sump, making it challenging to maintain proper oil pressure especially if the oil is run low, in addition to maintenance challenges when working on the engine head, such as valve covers, spark plugs, valve adjustments or head gasket replacement.
Common failure points on these engines include connecting rod bearing failure (due to running too low on oil), oil and coolant mixing together (creating a lack of lubrication) due to head gasket failure, weak head bolts or under torque, oil consumption and ring land failure.
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