I recently changed the rotor and cap on my glastron sx175 3.0l Volvo penta and the old ones showed normal wear. I noticed some yellow sludge on the flat base area under the rotor. 2 days later there was yellow sludge under the distributor cap on the metal plate by the rotor contact. The boat was not even used since I tuned up the motor. I had tried to start it after the tune up but the engine would not turn over and the starter was making a ticking sound. All battery / wire connections are clean and tight. Where can this yellow sludge be coming from? The boat engine bay is spotlessly clean.