[John_AZ]

shogunther,

I measured my "old" OEM seal I just took out of my 1987 924S-it is ~12.2mm thick measured with a cheap Harbor Freight caliper. It is red/rust in color and has ribs top to bottom. The seal prior to removal was "almost" flush with the block-just a tiny bit below.

The OEM KACO seal Pelican sells and the one I just installed in April is a little less than 12mm thick and has ribs only on the top/outter area. My conclusion/reasoning was that KACO wanted a fresh surface on the crank to seal, a little deeper if you follow me, and that is why the seal is ~12mm thick. You can see it in my earlier seal picture.

I also measured, again roughly, the depth of the seal "ledge" from the block face to the ledge.
It is about ~14.7mm. The block face to the bottom of the screwdriver slot is ~7mm.

I do not know what brand of RMS you are using. If you measure the seal that you put in upside down and you got it flush, the seal you have just put in should fit.

Yes, the Arbor tool Pelican sells would do the trick. Did you get the 4" sewer cap to help you install this seal?

GL
John_AZ