Here's an in depth teardown of the Mazda MZR / Ford Duratec 4 cylinder engine and how it works!


The Mazda MZR is a 4 cylinder all aluminum engine designed by Mazda but also jointly used by Ford until today in their Duratec / Ecoboost 4 cylinder engine lineup. It has dual overhead cams, a timing chain, variable valve timing on the intake side and EGR. Ecoboost or MazdaSpeed versions come with a turbocharger bolted to the exhaust.


In this video, a failed Mazda MZR engine from a 2010 Mazda 3 is taken apart to examine how this engine works and what causes them to fail. In general, the engine has a simplistic design, with one main timing chain driving two overhead cams, and a smaller chain driving the oil pump. There are no balance shafts. The engine block has a separate ladder structure that retains the main crankshaft bearings, therefore an upper oil pan isn't required. The biggest design flaw is the lack of keyed crank and camshafts that would make timing the engine much easier; instead it must be manually timed.


This engine was making a loud locking sound. After teardown and analysis, it turned out to be due to lack of oil lubrication on connecting rod #4, which overheated and caused the rod bearing to spin. The extra clearance created by not having the bearing caused the piston top to collide with the head around the valves.


Skip to section in the video:
Introduction 0:00
Overview 0:21
Teardown 1:36
Component Analysis 12:13
Conclusion 16:07


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