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The engine knocking noise / piston slap seems to be a common issue across many Hyundai engines, including

Theta II 2.4, 2.0T GDI

Theta II 2.0 MPI (Sonata Korean models)

Gamma 1.6 GDI (Elantra Korean models)

Nu 1.8 MPI (Elantra North American models)

In Korea, the problem is believed to be due to cylinder scratches/scuffing.

This in turn, may lead to excessive oil consumption.

As we know, for our Theta II GDI engines, the oil starvation will lead to seizing of rod bearings and breakage of the connecting rod.

In other engines, the knock is the predominant symptom.

So some folks who aren't covered by Hyundai Korea's warranty (much less mileage than the Hyundai USA warranty) end up having to pay for the repair.

This link shows how the repair is done by boring the cylinders.

The difference in engine noise before/after the repair is quite noticeable.

The videos are at the bottom of the page

https://m.blog.naver.com/PostView.n...909&targetKeyword=&targetRecommendationCode=1
 

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Sounds very similar to the problem GM has with their 2.4 engine in the Equinox, they call it “zebra striped” piston rings. I have heard with those it’s caused by the piston skirts being too short, causing it to wobble and chatter as it moves in the cylinder.
 

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On one of the russian car web site were posted investigation about korean engine problems:
They are talking about hyundai 2.4 with seized bearings because of not adequate quality of the bearings. Starting from 2016 it was changed for better material. Oil pumps were reinforced and some changes in the rod done.
Also engines 2.0 with cylinder scuffingd becsuse of overheat. The pistons are like a tablets, small, doesn't transfer the heat well enough. So the problem fixed by adding those oil spray nozless inside of cylinders to spray pistons from the back. That decreases the temprature by 20%.
Here is the link:
?????? ? «????????» ????????? ? ????????? ????????? ????. KIA (OPTIMA, SPOTGAGE, SOUL), HYUNDAI (CRETA, TUCSON, SONATA). ??? ????????????? | ????????
 
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