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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Atabeach on April 18, 2026, 04:17:17 PM
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Not good. Oil leaking from behind alternator…What are my options ? All cleaned up now but oil seems to appear every couple of days. TIA
Ok UPDATE! Main seal leak…Photo #3. Are these 2 leaks related?
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What are my options ?
The first option is to use a pencil, or slender Phillips screwdriver, as a pointer instead of using your finger; either has less diameter, greater reach and would enhance specificity.:laughing4-giggles:
Your alternator's shaft seal might be leaking. That shaft connects with the countershaft that is turned by the crankshaft while the engine is running or while the starter is turning. As the seal wears, the amount will probably increase but not gush, thus eventually requiring Simple—or perhaps Soylent—Green and copious rags for cleanup in time for visitors. If this relic hasn't been ridden much, more riding could possibly stop the leak.
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Thanks Laitch! The leak appears to be getting worse. It has become my daily driver. Further, someone on MOTOBRICK commented this could be from a main seal leak…I have a leak out of the weephole at the bottom of transmission …can these be related? 😳 I will use a pencil in the future.
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The weep hole drips oil leaking from the engine output shaft O-ring, the rear main seal or from a transmission cover seal—the usual suspects. Transmission fluid smells like sulfur.