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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / April 2006repairing the mower
Hi, I don't have car that I'm capable of working on at the moment so I though I might pick on the mower. It's an MTD type with a B&S engine. It is getting old and has been very hard to start. The casing was rusting out, and there was a hole in the tank, but after getting it started it would cut the lawn nicely. So, I put some fibreglass matting in the wheel well, some poly resin on the cracked seal in the fuel tank and degreesed the engine... also fiddled with the carby mechanism to make shure the mechanisms looked like they were doing things (no screw adjusting). Now it won't start. well, it will start after pouring petrol down the carby, but won't continue to run. I've now pulled the carby float bowl off and it looked clogged up with crap. I cleaned it and went to refit, but couldn't find the pin that fits the float to the body. Now, I don't recall seeing a pin when I removed the float bowl, but it looks as if there's supposed to be a pin in the end of float? If I have lost this part, can I use something like a paperclip to repair? Could the mower operate without this pin fitted? Cheers, > Hi, > [quoted text clipped - 22 lines] > > Cheers, Yeah, you lost the pin. If you can find a substitute that fits without too much loosness, use it. It has to have one. Keep in mind that most repairs involve some expenses. A new pin might cost a dollar. While you are at it, get a new carb gasket also.  SignatureKevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green > Hi, > [quoted text clipped - 22 lines] > > Cheers, You just had to go screw around with the carburetor didn't you. If it was full of crap, then you really did need to go there. Now you have the added mechanical problem of the lost part. Make a pin or buy one and fix that. However, I suspect the reason that motor won't run is that the fuel passage out of the float bowl is plugged. The passage is very small and might be mistaken for a piece of dirt the size of a printed dot. Clean that with a wire or a pin and blow some air or carb cleaner through it. PS. I guess your other fixes are OK, but I would have favored sheet metal and POP rivets for the body repair. It would stand up better to the vibration and fuel. You can always do that if needed later. > Hi, > [quoted text clipped - 22 lines] > > Cheers, If you have an abrasive cutoff tool, a small drill bit shank makes a perfect replacement for the carb float pivot pins. But don't try to cut with a hacksaw, you will just frustrate yourself. Or if you have a small engine supply place nearby they probably have the right part (one thing I miss about Detroit, you could actually find parts for stuff... actually the small engine place was closer than the nearest decent FLAPS) nate Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel Thanks Chaps! As it turns out, the pin had just slid off to one side and lodged up against the motor. So, I've now refitted the fuel bowl, a new spark plug and sprayed the carby with cleaner. Still won't run!! It will start first pull when I spray the cleaner in the carby, but won't continue to run. I really don't want to pull the carby apart... any other suggestions? >Thanks Chaps! > [quoted text clipped - 5 lines] > >I really don't want to pull the carby apart... any other suggestions? get it over with and pull the carb. Your problem is just a clogged venturi fuel nozzle from gummy ( old ) fuel, and check the air filter for cleanliness. Use a sliver of wood or a toothpick to clean the fuel jet in the venturi. This takes all of 10 minutes. Lg > Thanks Chaps! > [quoted text clipped - 5 lines] > > I really don't want to pull the carby apart... any other suggestions? If it runs on carb spray only, then it is obviously not getting enough gas through the carb. This engine may have a crank case pulse operated fuel pump (usually a small rectangular device that the fuel line from the tank goes to before going to the carb). If it does, then it may be clogged or need repair. You may even have a clogged fuel line or fuel tank. Does the carb fuel bowl fill up with gas? If it does, then that leaves only the carb as the culprit. The only remedy is to remove and clean it thouroughly. New seals and gaskets will be required. A new needle vave and seat is also usually required. If the carb is corroded bad enough it might have to be replaced. SignatureKevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green Joy! I didn't initially understand Al's suggestion about cleaning the passage from the float bowl to the carby until I did a bit more reading on it.... anyway, it worked. I shoved a piece of thin copper wire up from the needle? to the carb air inlet and hey presto... the engine is purring like a kitten, though theres petrol leaking from the fuel bowl, (getting the gasket to sit nicely is difficult) and the wheels rattle like buggery, but I think it has a couple more years left in it. Thanks again for all the help! >> Thanks Chaps! >> [quoted text clipped - 13 lines] >carb fuel bowl fill up with gas? If it does, then that leaves only the carb >as the culprit. The only remedy is to remove and clean it thouroughly. ========================================================= > New >seals and gaskets will be required. This part is REALLY IMPORTANT! You have to have an absolutely airtight seal between the carb mounting flange and the engine. Use some kind of gasket and coat it with Permatex or something before mounting. Trust me on this. ANY air leak here, and you won't get the proper venturi effect to suck the fuel from the float bowl. Lg > A new needle vave and seat is also >usually required. If the carb is corroded bad enough it might have to be >replaced. More and more I feel my first suggestion was right and others do to. If you don't want to take the carb off then try to clean the outgoing orifice with a pin or wire with the bowl off. Turn the mower upside down if necessary, but don't get oil on the wife's carpet. >More and more I feel my first suggestion was right and others do to. If >you don't want to take the carb off then try to clean the outgoing >orifice with a pin or wire with the bowl off. Turn the mower upside >down if necessary, but don't get oil on the wife's carpet. Your ex-centric puns are mower than I can handle. And I ain't no pussy. Signature-john wide-open at throttle dot info you'll need the pin, it is a l m parts house item, a paper clip will do, a little small. you need to clean the fuel system, maybe a can of auto stuff will help. clean the air intake filters or replace, and install a new condenser and points. (kit) the air adjusting screw on the carb, screw it in easily, bottom-out, and back-out 1-1/2 turns. (fine tune if necessary) and, you'll be up and running. mho ve >save gas - by reducing your driving - 10%. |
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