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Ever wonder what's inside an engine with over 300,000 km?


In this video we teardown a Toyota Prius 1NZ-FXE 4 cylinder engine from a 2004 Toyota Prius. The engine features drive by wire throttle body, cast aluminum intake manifold, aluminum head and block, dual over head cams with variable valve timing on the intake, an accessory belt for the water pump only, and a timing chain powering the two camshafts.


The Prius engine is the detuned version of the 1NZ that makes less power but is more efficient because it runs on the Atkinson cycle.


After removing the oil pan, timing cover and valve cover it is evident that after 17 years and 300,000+ miles the engine is tarnished dark on the inside. The oil control rings are clogged, and carbon buildup is evident on the piston heads. The bottom of the sludge and oil pickup is lined with sludge. The intake system has carbon buildup from the PCV system. In conclusion, while there is no evidence of mechanical wear just due to high mileage, the lesson learned here would be to take care of the oil system in your engine if you want it to last longer than the rest of the car.


You can purchase tools used to tear down engines here:


Impact Wrench:
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Engine hoist
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Impact sockets:
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(Canada)
Breaker bar:
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(Canada)
Angled needle nose pliers:
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(Canada)
Bi-hexagon socket for Toyota headbolts:
(US)


This is the Camera I use:
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