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Measuring RMS Install Depth

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I am probably being an idiot here, but I know the install depth is 13mm and I know it is measured from the flywheel flange of the crankshaft but....measure to where?  Where the seal contacts the crank?  To the edge of the outer metal rim of the seal?  Where?

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OK, face of seal, and now that I look there really isn't any other place to measure is there?  Thanks for the quick reply.


I have already installed my new seal quite a bit too deep, so I guess it will be $30 stupid tax or practice or whatever you want to call it and I'll try again.

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I removed the new seal and will try again Monday.  I did some measuring and while there is plenty of seal surface on the crankshaft to make an increased installed depth work OK, there isn't that much depth on the OD at the crankcase.  I was close to having it past the point of no return.  I'll get it right this next time - my excuse this first time is the visibility was poor working under the car.

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