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Join Date: Feb 2020
Car: Bmw 135i coupe
Default N54 crank discolouration - 01-05-2022, 02:30 PM

Hi all, I was replacing my sump gasket on my 135i and noticed that around the big end journals on the crank there is some discolouration on the crankshaft, should I be worried and check my rod bearings? I have found an article that said its normaly due to the forging process of the crank? All 6 seem to have this blue discolouration around them
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