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Home> Maintaining your Continental and Lycoming engine Solving oil leaks at the Lycoming engine crankshaft sealConditions may make it impossible to seal the crankshaft, These are:1. Excessive clearance between the main crankshaft bearing and crankshaft journal which allows more oil to leak out of the bearing shell, thereby delivering more oil to the crankshaft oil slinger.
2. A bent oil slinger. As the crankshaft rotates, the slinger wobbles, thereby becoming an efficient oil pump. 3. Not enough clearance between the front slinger face of the crankshaft and the crankshaft nose seal retainer. Lack of clearance will trap oil and sling it forward into the seal. If you have any of these conditions, it requires complete engine? With the nose seal removed, pull the crankshaft forward. The crankshaft thrust face will now be against the crankcase thrust face. There should now be 2 to 7 thousandths clearance between the crankshaft slinger and the nose seal retainer. Slip a piece of paper in behind the nose seal casting on the crankcase and see if it fits between the casting and the crankshaft slinger. If it does not fit, you do not have the proper clearance. Rotate the crankshaft, making sure it stays forward and see if the clearance oscillates. If it does, the slinger is bent and will pump oil into the seal. If you do not have at least 2 thousandths (preferably not fewer than 5 thousandths) clearance, how do you change it? The Lycoming engine overhaul manual explains how to grind the face of the oil slinger until you get the proper clearance. Any time you inspect a crankshaft for run-out, also inspect the crankshaft slinger and check the clearance between the slinger and crankcase when you lay the crankshaft into the case during reassembly.
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