My dad has a 1977 Evinrude 85hp that he had since new. Not much has been done to the engine besides replacing impellers a few times and some lower unit seals. He had some issues last summer with leaking fuel. I helped him replaced all of the fuel lines, rebuild the carburetors using OMC kits, and rebuilt the fuel pump using an OMC kit. The diaphragm of the fuel pump had a pin hole which seemed to be the leak issue. Now with everything replaced/rebuilt, and pumping up the primer bulb, there is no fuel leaking anywhere on the engine. Motor has always and still does run excellent.
After this work, there is oil leaking out of the port coming from the lower crankcase. There is a small nipple on the crankcase with a hose going to the lower corner of the air silencer box. I am assuming this always had oil coming to it in the past when tilted up, but now it is dripping out of the air silencer cover halves for about 30 mins after running the engine and tilting it up. My dad had never had oil dripping out of here until this work was done. Boat is stored in a garage, and docked for a week at a time when using it. When docked, the motor is tilted up as the depth of the lake at the dock is shallow. This has been done every summer since this engine was new with no oil leaking out of the air silencer cover.
I removed the air silencer cover after using the boat last time and 2 stroke oil, about 1/2 ounce, would leak out over the course of 30 minutes then quit. Since the cork gasket between the halves of the air silencer cover was original, I assumed this was the culprit. I ordered a new OMC cork gasket thinking this would solve the issue of leaking oil. My dad put in the new gasket this week and said it is still leaking oil after he runs the motor & tilts it up after use.
I believe this port on the air silencer cover is supposed to suck any fuel leaking out of the carbs back into the crankcase to be burnt when the engine is started next. I also am assuming that the 1/2 ounce of oil that drips out of the crankcase is what is coating the bottom end of the engine and when the engine is shut off/tilted up, the oil film on all of the internals is settling to the lowest point (this fitting on the lower part of the crankcase) and the oil is settling into the air silencer cover via the hose connecting the nipple on the lower crankcase to the air silencer box.
The carbs are not leaking any fuel when the engine is tilted up after running. The 2 stroke oil leaking into the air silencer box is blue (Johnson/Evinrude 2 stroke oil) and doesn't smell/taste burnt.
From my research, this cork gasket should not be coated with gasket sealing compound. Am I wrong here? What else can I try to keep this oil from leaking out of the air silencer box.
After this work, there is oil leaking out of the port coming from the lower crankcase. There is a small nipple on the crankcase with a hose going to the lower corner of the air silencer box. I am assuming this always had oil coming to it in the past when tilted up, but now it is dripping out of the air silencer cover halves for about 30 mins after running the engine and tilting it up. My dad had never had oil dripping out of here until this work was done. Boat is stored in a garage, and docked for a week at a time when using it. When docked, the motor is tilted up as the depth of the lake at the dock is shallow. This has been done every summer since this engine was new with no oil leaking out of the air silencer cover.
I removed the air silencer cover after using the boat last time and 2 stroke oil, about 1/2 ounce, would leak out over the course of 30 minutes then quit. Since the cork gasket between the halves of the air silencer cover was original, I assumed this was the culprit. I ordered a new OMC cork gasket thinking this would solve the issue of leaking oil. My dad put in the new gasket this week and said it is still leaking oil after he runs the motor & tilts it up after use.
I believe this port on the air silencer cover is supposed to suck any fuel leaking out of the carbs back into the crankcase to be burnt when the engine is started next. I also am assuming that the 1/2 ounce of oil that drips out of the crankcase is what is coating the bottom end of the engine and when the engine is shut off/tilted up, the oil film on all of the internals is settling to the lowest point (this fitting on the lower part of the crankcase) and the oil is settling into the air silencer cover via the hose connecting the nipple on the lower crankcase to the air silencer box.
The carbs are not leaking any fuel when the engine is tilted up after running. The 2 stroke oil leaking into the air silencer box is blue (Johnson/Evinrude 2 stroke oil) and doesn't smell/taste burnt.
From my research, this cork gasket should not be coated with gasket sealing compound. Am I wrong here? What else can I try to keep this oil from leaking out of the air silencer box.
