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A lot of the mess on these old motors come from around the top crankshaft bushing.
The don’t have seals, but rather “slingers” that try to keep the excess oil under
the slinger while it tries to drain down a port back to the crankcase.
Drain ports can become plugged, etc., but there’s always going to be some mess.
When you pull the flywheel to go through the ignition, you probably see “more” mess.Prepare to be boarded!
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A few things come to mind that would cause the oily residue. The person filling the tank was not very neat, and there was fuel spilled around the filler cap that drained down to the bottom of the tank. There could be a leaking cap gasket. Then there could be a leak in the fuel supply system from the threaded hole in the bottom of the tank to the carburetor. If it was leaking at the tank connection, then that fuel can end up in the tank mounting ring.
These motors have a primer instead of a choke. The primer sprays a small amount of fuel mix out of the rotary valve port which ends up on the inside of the lower cowl. Not the most environmentally sensitive design, but bear in mind this design was from the late 1930’s.
Here is a very helpful site for “T” series motors: Fuel Tank and Fuel Tank Valve Cl (pochefamily.org)
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That oily mess, likely helped preserve grandpa’s motor… not a bad thing. Do not use harsh alkaline cleaner , a little WD40 or mineral spirits on a rag will do the job… extra care around decals, please.
Joe B
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Fact is those motors were far from “clean”. But they sure ran well
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theyare all dirty in a tub….when the incoming load of fuel oil pushes out the exhaust on the up stroke both in and out ports are open so fuel oil bypasses the cyl and ends up outside in the exaust….and the water in the tub.
conclusion…. don’t worry about it 🙂 that is why modern EFI engines consume much less fuel since all the fuel is burnt up before leaving the cylinders . oil is mostly used outside the cylinders being routed (pumped) directly in the crankcase for lubrification. my 75 ETEC burn .6l/hr trolling ! next to nothing compared to my 9.5hp from the 60s
Joining AOMCI has priviledges 🙂
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Thanks for the link, I’ll check that out. So….from what I’m hearing these motors were not the cleanest. The last time I ran this motor in a tank, I was surprised at the amount of oil that was left in the tank water. I suppose the best thing, not to do, is over prime the carb and becarefull when putting gas in it. I also noticed that the washer under the gas cap is hard as a rock.
For the gas cap washer replacement, a water meter washer from a good plumbing supply is a very good solution. Years ago, I bought about ten or so and every now and then I need one for a TD, JW, or Lightwin.
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