Скачать или смотреть BMW S55 Crank Hub Test – You Won’t Unscrew This!

In BMW N55 and S55 engines, the crank hub problem can destroy the whole engine in a split second.
In this episode I show a simple but brutal comparison test:
🔧 OEM BMW crank hub vs MEHENKER crank hub with Nord-Lock washer

Ultra-strong MEHENKER crank hub in our shop:
https://mehenker.com/pl/kola-rozrzadu...

I mount an N55 crankshaft in a vise, tighten both hubs to 100 Nm + 90°, and then try to loosen them:
first the original BMW crank hub,
then the MEHENKER crank hub with micro teeth and Nord-Lock washer.

You will see:
how strong the OEM hub holds, and that you can still loosen it with a normal wrench,
how the MEHENKER hub holds so hard that I have to cut the bolt with an angle grinder,
close-ups of the micro teeth biting into the crankshaft journal,
why this solution greatly reduces the risk of crank hub slip, especially on high power engines.

Chapters:
00:00 – Introduction
00:46 – Explaining the crank hub problem in S55 and N55
03:49 – Description of the loosening test
04:22 – Loosening test of the OEM crank hub
05:20 – Attempt to loosen the MEHENKER crank hub
07:02 – Test summary: OEM vs MEHENKER

If you drive a BMW M2, M3, M4 or a tuned N55 and you want to protect your engine – this test is for you.

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