682 won't start

[enigma]

Thank you everyone! ...
I checked the oil last night - wow, definitely gas in the oil. Pulled the plugs and one cylinder is full to the top with gas and that plug is black/burnt. Pulled the carb, intake, and finally the fuel pump to find the pump internals completely shot - this appears to act as a suction type compression across a barrier to keep the gas away from the rod that goes into the block to move and create the suction. Clearly that barrier is toast, which is allowing gas into the block through the moving rod/arm.

So, I've got a new fuel pump, carb kit, and new needle on order that should be here Friday. Need to pick up oil and new plugs too.

Hopefully the 682 will be running properly again!! Thanks!

[enigma]

Ok, completed the job.

First time starting, it blew a ton of white smoke. After stopping it, the smoke turned thick grey-ish. I pulled the exhaust cover off and the smoke is coming from the bottom of the U bolts that connect the muffler pipes to the bent pipes actually bolted to the block. Its almost like there is left over gas or something in the muffler and its just burning off. I did check that the U bolts were tighted down and after sitting for days, I'd expect there isn't really gas left around them.

Started up again. Same thing but this time, when powering it off, it backfired. Never actually seen the tractor do this before (or any small engine for that matter) but there was actually a visible flame that shot out of the exhaust pipe.

Let it sit for a while and then started it again. No issues. Smoke was very very minimal (still white but may be slightly blue) and clearly this is related (partially at least) to the carb as adjusting the carb reduces the amount of smoke. Got the carb all set and dropping the throttle to nothing to turn it off gets it to not backfire.

So, I guess I'm done. I'm not real happy with the little bit of smoke still coming from the engine/exhaust but adjusting the carb further doesn't completely get rid of the smoke. I'm assuming the gas in the block ate the seals a bit allowing for oil to now be burnt.

[J-Mech]

Gasoline in the motor doesn't really "eat" any seals that would make it smoke. It will however, especially since you didn't catch it early, will REALLY clean things up. You may have had a lot of carbon on the piston, and perhaps even in the rings that may in fact be gone now. Yes, smoking after a problem like this is normal for about the first maybe 30 min of operating. When the oil got thin, it would have been able to bypass the rings, and thus is in the muffler. The backfiring should go away. And you should ALWAYS go to low idle for a few min before shutting down the motor. Make sure the carb is set right and run it. If it doesn't quit smoking, let us know. Lets just hope it didn't damage the rod bearings. Oh, and watch for oil leaks. The gas in the motor may have soaked the gaskets enough to make them leak now. Not usually, but it could happen if the gasket was getting weak/old.

[enigma]

J-Mech, so it is definitely burning and leaking oil. I'm not exactly sure where the oil is leaking from but it appears to be on the (not sure of the proper terms) thin sheet metal between the engine and the frame/white side panels up to about half way up the engine. It's almost like the leak is between the block and the heads and the vibration is causing it to splatter against the sheet metal.

It is also burning oil - when making the engine work hard (either starting it and letting it warm up, pulling something heavy, or climbing a hill slowly), I see slight blue smoke from the exhaust.

I mowed the lawn this past weekend (I'm on 2 acres with roughly .9 acres of grass and the entire grass part of the property is a continuous hill of something like 12-15 percent grade) and after getting most of the way through, the tractor sputtered and died. Pulled the oil dipstick and !!! no oil level registered. Gave it time to sit and checked again - same thing (yes, it was on a level surface). Gave it enough oil and an hour later it started up again.

So I guess I'll be checking the oil often while using the tractor from now on!

I thought it was toast when it quit due to lack of oil - sputtered and died with lots of thick grey/slight-blue smoke.

[J-Mech]

Originally Posted by enigma

I thought it was toast when it quit due to lack of oil - sputtered and died with lots of thick grey/slight-blue smoke.

It is toast. You scored a piston. Sorry to be so blunt, but that's the truth of it. If it died with lots of smoke and you found it low on oil but wouldn't run.... then let it cool, topped it off and it ran again, then it scored a piston. Sorry man, better look for another motor.

[enigma]

Yea, I figured it was pretty much done. I'm going to draw it out as long as I can - even though it sounds terrible/etc. We'll see how long it lasts.

Got any suggestions on a replacement tractor with loader and belly mower that is perfectly fine with a property with all grass (.9ish acre) on a slope?

Thank you for your input/knowledge!

[Sam Mac]

Originally Posted by enigma

Yea, I figured it was pretty much done. I'm going to draw it out as long as I can - even though it sounds terrible/etc. We'll see how long it lasts.

Got any suggestions on a replacement tractor with loader and belly mower that is perfectly fine with a property with all grass (.9ish acre) on a slope?

Thank you for your input/knowledge!

Something along these lines, may be a bit of overkill.
http://www.tractorhouse.com/listings...x?OHID=8571227