I had a couple of seals go bad over 11 years in my Cherokee 140. Both
times the seal itself was blown completely out of its land (there was NO
sealing action). Both times we noticed a residue on the inside of the
flywheel pulley and a few fine drops on the windshield. I once flew it
for 2+ hours in that condition and did not lose a measurable amount of oil.

However, I once saw a Warrior that had blown a seal and it was down 3
quarts after a 1 hour instruction flight. Upon shutdown, there was a
stream of oil running out of the flywheel and a puddle on the ground.

The fix involves removing the prop and stretching a new seal over the
crankshaft flange, then glueing it into place.

Good Luck,
Mike

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