In terms of Subaru engines, consideration typically falls to the boxer 4. And why not? From the outdated EJ22T to the EJ25 that powered just about each Subaru at one level, it is the engine that is synonymous with the Japanese model.

That is what makes this I Do Automobiles video so attention-grabbing. It focuses on the lesser-known 3.0-liter EZ30 flat-six, pulled from a 2005 Subaru Outback that had simply over 200,000 miles. We’re used to seeing full carnage from these teardown movies, and this engine was deemed too defective to save lots of. However the prognosis was the results of a failed leakdown take a look at, and upon inspection, it is not instantly clear what would possibly’ve occurred.

What is evident, nonetheless, is that this engine has been out of a automotive for fairly a while. Important corrosion across the outdoors is seen proper from the start, and that makes this teardown infinitely tougher. Cussed bolts find yourself breaking, and harm is not relegated to fasteners. Whereas taking one of many valve covers off, a corroded bolt truly breaks the quilt. The remainder of the quilt is actually damaged into items whereas attempting to take away different cussed bolts. Subaru’s H6 could have a repute for reliability, however it certain would not like coming aside.

However the disassembly course of continues, and with every half eliminated, its motive for being condemned turns into an even bigger thriller. Lastly we get to the underside finish the place, often, we see some type of mutilated steel. However not this time. Other than some irregular (however not detrimental) put on on the rod and major bearings, the whole lot on this engine is ok.

So what provides? This engine initially failed a leakdown take a look at, suggesting a lack of compression in a cylinder. That often means important harm to some inside elements, however on this case, it might have simply been some corrosion within the valvetrain stopping valves from sealing correctly. It is even theorized that, after working and reaching working temperature, the engine could have mainly mounted itself. Now, that may by no means occur.

However the video exhibits the internal workings of a seldom-seen Subaru engine, and to the automaker’s credit score, it seems to be fairly overbuilt. On the very least, engineers certain made it tough to take aside. Preserve that in thoughts the subsequent time you determine to postpone an oil change in your flat-six Subie. If something does occur contained in the engine, even one thing minor, it may be a serious expense getting it mounted.