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need help on the Tecumseh again...

A

Aaron in IL

Member
Well, I got the troy-built out to do some tillin and seat the rings and I have run into more trouble. Now there is oil dripping out of the air filter and the crankcase breather plat is leaking oil. It ran fine till I tilted the tiller up to dig some trash out of the tines, but then the motor bogged down and let out a cloud of smoke like hell wouldn't have, then died. I then started it back up and it smoke a little more then cleared right up. I can't figure out what would be causing it to do this. It also sounds like something is knocking, I thought maybe it was a fan shroud but I can't seem to find one loose but I have the head off and when the piston is at TDC I can turn the flywheel about an inch and the piston won't move. Is this the cause of my knocking? I'll take any help at all, I'm about at my wit's end on this one.
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I rebuilt one of those in shop class when I was a kid and it did the same thing yours is doing. It kept sheering the key for the flywheel and spitting out the oil. If I remember right there is some sort of filter in that plate. Take it off and replace it and it should stop the leaking oil if I remember right. ICheck your key, it has probably been patially sheered or completely sheered. Honest advice is to get rid of it and find a briggs & stratton to put on it. I'm not trying to knock your motor but they just plain sucked. Good luck to you.
 
Sounds like the engine is worn to the point the Rod bearing is loose and making that knock sound. Another indication of wear in the piston rings is the oil coming from the crankcase breather, going into the air cleaner. (See the picture where the hose goes from the breather into the air cleaner.)
I bet with the oil blowing away like that it got low in the crankcase and that is why you have a knock now.

Probably time for a new engine. If its on a Troybilt, and not a pony, I would just get another engine.
 
Position the Piston at half way down. Now move the FW. if it moves ayn without moving the piston, do not put it back together. It will need at least a rod, if not a crankshaft. Putting a Briggs, or adapting a Honda would be far better than throwing money at a toward a previously eaten sandwitch. (if you get my drift) Jim
 
The piston isn't going to move at TDC, as the big end of the rod is moving side-to-side a short distance. If it wasn't doing anything wrong until you tipped it, I suspect it was a little over full. No need to worry about the smoke, it just got sucked in when you tipped the motor. You didn't really need to take it back off, but since you did, get some plastigage and check the rod clearance. If it is excessive, file the rod cap and the rod evenly a small amount to reduce the clearance.
 
Unless there is some emotional reason or you are trying to perfectly restore your tiller why are you messing around with a Tecumseh? They went out of business, there is a reason why- their engines were not as good as their competition and the China Honda knock-offs took the lower end of the small engine market. Briggs & Stratton, Honda and Kohler all make good engines. LCT and some of the Chinese knock-offs are better engines than your Tecumseh and will cost you less than fixing your Tecumseh, use less fuel and burn cleaner.
 
Did you have the breather apart? If you did it sounds like the inner plate is upside down, small drain hole to the bottom. The gasket might have a notch for the drain hole.
 
The only reason I'm trying to fix it is that I just put a new piston, rings, and valves in it. I guess I might mess with that breather plate and runner til she blows up and then put a replacement motor. Thanks for the replies!
 
I'm on my third engine on my 1978 troybilt. I use to use in commercially when I first got it and used it allot. It came with a 7 hp Kohler. The second moter was a Tecumseh which lasted about a week and the block cracked and was spraying oil out the side. They did give me credit toward the 8HP. Kohler I replaced it with. Thats been about 15 years ago and it still runs good. Although I don't use it allot anymore. I did have to replace the fuel pump last year. I would look into a Kohler engine if you decide to replace your current motor.
 
Hahaha?? Kohler is junk, I had a 6hp command horizontal, piece of junk. I have a 27 hp horizontial and the crank gear is pressed on with no key, at 1700 hours the gear split, no bearings in engine, whole thing was scrap. God sakes at least key the gear. I will never buy another kohler again.
 
Another thing that causes knocking is one of the screws holding the recoil starter may be contacting the flywheel either from being too long or the fan shroud bent. Does that thing have a front bumper? I see now you don't have the engine off. But to be on the safe side,take it off and check the rod out. (from where you're at now, you can have it in your hand in 20 minutes). Filing can be a bit touchy, and a new rod doesn't cost all that much. In a worst-case scenario, if you do actually need a crank, I'm sure you can find a good used one if money's tight. Just because Tecumseh's out of business doesn't mean parts supply ceased to exist. You just can't go down to the corner lawn mower shop anymore. Try places like V.E. Peterson, (you know how long Clinton has been out of business? You can still get those parts), American Air Cooled, Ohio Materials Handling, any engine shop with a gray-haired gent behind the counter, the internet... that Indian-Head isn't ready to retire yet
 
There's also Walter A. Smith 610-749-2151, 2). Bob's small engine Marion, Iowa 319-377-3339 3).Parts Hotline 800-274-7717 4).Turpin outdoor Power Equipment, Lexington,Va. 703-463-3321 5).Pitt Auto Electric 412-766-9112. This list was compiled while I was looking for a discontinued air shroud/fuel tank for a Cadet 60. These are known dealers with discontinued parts, while Tecumseh was still in business. I doubt they threw all those parts in the dumpster when Tecumseh closed the doors.
 
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