Originally Posted by
Crickett
From reading install instructions & DIYs (TIS, FCPEuro, E46f, etc.), I came away with the understanding that the white donut is to install the RMS (in the housing) on the crankshaft without the inner lip deforming, bending, ripping, etc. but this tool (or something else? Just careful, steady hands?) is required to install the RMS in the housing in the first place without the outer lip deforming, bending, ripping, etc.. In other words—assuming you have a RMS not pre-installed in a new housing—the steps are 1. Install the RMS into the housing using the above tool (having temporarily removed the white donut first). 2. Install the RMS-and-housing assembly onto the crankshaft w/the white donut. 3. Remove white donut and install bolts.
If I’m missing something, let me know, especially if you’ve done this maintenance!