yanmar ym 2000 won't start

[garyd]

I have a yanmar ym 2000 that will not start with out the help of ether. I am afraid that there is major damage to the engine. Let me give you alittle background on what has happend. This spring I was at the neighbors house doing some tilling for his garden and I was working the tractor hard. the tractor began to bog down and lose power and would not turn the pto. I had the throttle in high and she blows black smoke. I gave up on the tilling and drove the tractor home as it was dark. the next morning I went out tho check the tractor out to see what he problem was, I thought maybe there was a build up of weeds in the tiller. that was not the case so I started the tractor. the tractor started but the lack of power contuid when the pto was engaged, I tilled about 5' and the trator died under load. I started the tractor up again and the problem worstened until the tractor would not drive but die and then not start at all. There tractor set 100' from the shop dead. I checked the fuel fillter it looked good but I changed it any way. that did not help. tractor would turn over but would not fire. I had the wife with the help of the 4 x 4 tow the tractor to the shop and there it has set. I have tinkered with it off and on this summer to no avail, I had a friend tell me to use a little ether to try to start it. He said if it started the rings are bad, low compression. The tractor runs but sounds bad more knocking than normal, tons of white smoke on idle black smoke on high throdlle, the motor seems to get hotter than normal, I have bleeded the injectors. I need help and dont know were to start. thanks for any help.
Gary <><

 

[SATOHBULL]

I don't think you will get any good news. It really sounds like the compression is very on one cylinder at least, maybe both. The white smoke is unburned fuel most likely. So either one cylinder doesn't have enough compression to ignite all the time, or both don't some of the time. The black smoke is over fueling by the injectors. If you have both I would guess one cylinder is doing all the work, thus the white smoke from a nonfiring cylinder and black from the one overworked cylinder. Best bet is check compression or pull the head and have a look.

One other thought, check the valve lash, it is possible that a valve is too tight or sticking and dropping compression. Not likely, but checking that is free!

 

[elarson]

Hopefully it's a fuel delivery problem, but the symptoms are a little disconcerting. Is there any discharge of air and oil spray from the vent tube while the engine is running? If it is a piston related compression problem it will be pumping alot through that tube. Check the oil fill/dipstick hole and the radiator for the brownish foam that would indicate a cracked casting or blown head gasket. Eliminate the disastrous stuff first, and then i would lean toward checking the fuel injectors and pump. Might try moving this thread to the Yanmar forum too. Hope it turns out to be something simple. (And swear off the ether, please. At best it won't help the problem, at worst it will jack some parts out of shape)

 

[garyd]

There is alot of blow by that comes out of the tube by the injector pump. I dont know how to move the thread. I dont know what to do next, probably pull the head off and see what damage has been done. Is there a rebuild kit available or just piece by piece.oh no water in oil no oil in water.

 

[elarson]

I think you're on the right track. If it were me I'd be taking off the head to find out what happened. Sounds like it happened pretty quickly, indicating a sudden breakage. If it is a broken part and not a matter of the whole engine being worn out, an entire overhaul might not be necessary. At any rate I don't know of a rebuild kit being offered. As far as moving the thread, only the moderator can do that. Might just let this one fizzle, and post a new one with what you find in the Yanmar forum.

 

[garyd]

Thanks Eric
I'll be pulling the head off this weekend, I hope.
I'll post in the yanmar forum with what I find.

 

[normde2001]

I assume you have checked the air cleaner. Before you go tearing into the engine, remove the muffler and see if it will start. In fact there is a lot of troubleshooting to be done before messing with the engine.

 

[greatrandini]

I would change the fuel bowl, o ring, and filter and bleed the fuel lines all the way including breaking the nut at the injector pump. I bet ur sucking air.....They won't start good or run if this happens....I would do this first just in case cuz it may save u alot of work....

 

[normde2001]

"The tractor runs but sounds bad more knocking than normal, tons of white smoke on idle black smoke on high throdlle, the motor seems to get hotter than normal, I have bleeded the injectors. "

I'm wondering if you bled the fuel system properly, before and after the filter, and at the pump, in that order. No need to bleed the injectors. The pump will do that, if properly bled/primed.

 

[bruce1966us]

Could be a bad injector.