901 input shaft diameter at the seal surface area Options

[flxzcat]

Does anyone know the actual input shaft diameter at the seal area?

Mine measures 21.84.

I have been through 3 seals in the last 200 miles in my new to me BaT 914.

I am an experienced mechanic/fabricator ex F1, INDY and IMSA. I have tried all the tricks I know and checked all failure possibilities and the only conclusion I come to is that the shaft has been ground undersize. The 3 different seals from 3 different suppliers all leaked within 10 miles (IMG:style_emoticons/default/headbang.gif)

This car is basically near perfect in, out and under with a true 70K total miles and only 2k on an LN Engineering kit 2.3 build.

Thanks in advance,
Paul VDL

[rgalla9146]

I have two shortened input shafts that I use as clutch alignment tools.
Don't know their origin.
They measure 21.95 and 22.10
Original seals most often have their dimensions molded into them.
Look closely.
Have you inspected your pilot bearing ?
Does the clutch engage smoothly ?

[Krieger]

Have you looked at the condition and presence of the pilot bearing on the the flywheel? If nothing is up there the input shaft seal will leak. Ask me how I know...