I have a Johnson 8hp longshaft circa late 80ties early 90ties. At the last sectional portion of the shaft, there is black oil seaping out. Could anyone tell me if this is a possible gasket problem or something else. It wasn't serviced too long ago. Any help appreciated.
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It's possible
that this is unburned engine oil. There is not a gasket between the lower unit and the leg of the outboard. If you run a little rich on oil, and use some choke when starting up, it is more than possible for unburned oil to run down the inside of the leg, and build up at the junction with the lower unit. As I said, there is not a gasket at that junction, and it isn't sealed. If the oil is coming out below that point, then there is something else going on. And as 48dodge said, the lower unit oil is generally more yellowish than black. The unburned engine oil, is definately black.
that this is unburned engine oil. There is not a gasket between the lower unit and the leg of the outboard. If you run a little rich on oil, and use some choke when starting up, it is more than possible for unburned oil to run down the inside of the leg, and build up at the junction with the lower unit. As I said, there is not a gasket at that junction, and it isn't sealed. If the oil is coming out below that point, then there is something else going on. And as 48dodge said, the lower unit oil is generally more yellowish than black. The unburned engine oil, is definately black.
I have it too
I noticed the same thing on my 3.5 HP and 25HP on winter layup. I thought it was fogging oil that came down the exhaust manifold. Both engines run fine year after year (know on wood). Rob
I noticed the same thing on my 3.5 HP and 25HP on winter layup. I thought it was fogging oil that came down the exhaust manifold. Both engines run fine year after year (know on wood). Rob
Had this problem on my ol' Johnson 4.5
Had the same issue with my Hunter 22. I ended up replacing a seal somewhere, could have been in the shaft, and it fixed the problem. Try to research it on Hunterowners.com and you may find the post about it. I had posted pictures with it.
Had the same issue with my Hunter 22. I ended up replacing a seal somewhere, could have been in the shaft, and it fixed the problem. Try to research it on Hunterowners.com and you may find the post about it. I had posted pictures with it.
Watch your
watch your lower unit oil. On that motor, there are only two places any oil can come from. If your lower unit isn't losing oil or getting water in it, then it is unburned engine oil. Not a problem. But you might check your fuel mixture, or change oil brands to help it some. If your losing lower unit oil, or have water intrusion into the lower unit, you have a seal leaking. There is a seal on the prop shaft, and one on top of the gear housing under the water pump. Some of the smaller outboards do not have a seal on top of the water pump and some do, but this will not let oil leak out. Only the one on the prop shaft and on top where the drive shaft goes in will let oil leak out. Pull the drain plug on the bottom, under the gear housing, just enough to get a couple of drops out. Make sure the engine has sat at least a couple of hours. If you have any water in the lower unit it will be what comes out first. You only need to let out a few drops to check. If it has water in it, the oil is gone, or going, and you need to replace the seals. If you have to do this, don't waste time and money replacing one.
watch your lower unit oil. On that motor, there are only two places any oil can come from. If your lower unit isn't losing oil or getting water in it, then it is unburned engine oil. Not a problem. But you might check your fuel mixture, or change oil brands to help it some. If your losing lower unit oil, or have water intrusion into the lower unit, you have a seal leaking. There is a seal on the prop shaft, and one on top of the gear housing under the water pump. Some of the smaller outboards do not have a seal on top of the water pump and some do, but this will not let oil leak out. Only the one on the prop shaft and on top where the drive shaft goes in will let oil leak out. Pull the drain plug on the bottom, under the gear housing, just enough to get a couple of drops out. Make sure the engine has sat at least a couple of hours. If you have any water in the lower unit it will be what comes out first. You only need to let out a few drops to check. If it has water in it, the oil is gone, or going, and you need to replace the seals. If you have to do this, don't waste time and money replacing one.
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