Go BottomStarting a warm B7200
 | rgpbeme
Join Date: Mar 2006 Posts: 55 Eureka Springs AR 
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2006-09-11 135095
I have a little B7200. It starts up and runs fine. After it runs for a while and is good a warmed up it will not restart if you shut it off. If you let it set for 10-15 min it starts right up again and runs fine. It is not overheating it is timed alright. It almost seems like a car that the timing is to far advanced on . I have tried all combos with the compression release and fuel shut off. I did get it to start once by pulling the fuel shut off and the compression. Turned it over till the exhaust was clear. Pushed the fuel and compression knobs in at the same time while cranking it over (which takes 3 hands) but it only worked once. Is there a seceret?
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York 
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2006-09-11 135097
Does this smoke a lt when running? ....
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| rgpbeme
Join Date: Mar 2006 Posts: 55 Eureka Springs AR
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2006-09-12 135119
It will put out some black smoke in the exhaust when it first starts and after it is warmed up under a load. There seems to be a steady amount coming out the vent tube.
It puts out tons of black smoke unless it fire up.
That is why I thought I should shut the fuel off till it is cranking good. Like maybe it was flooding. (The air filter is new) I thought it might be out of time but once the dealer told me how to time it (which is different then the book)The timing is about 2 degrees lean or before the f1 mark. The tractor has 759 hours on it.
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2006-09-12 135121
RG, I don't know the history of this machine, but from what you are saying it sounds like the injectors are leaking diesel down into the cylinders.
It starts fine when cold because the diesel has either bled off into the oil, or evapourated.
There should never be smoke coming out of the crankcase vent tube, that indicates a bad blowby condition, something it should not have at 759 hours.
It could be something as simple as dirty injector tips leaking, or it could be they need an overhaul, if they are rebuildable. Art could tell you for certain what your options are there.
If you have a real good diesel shop (pump & injector specialist) you might want to start with them.
Best of luck. ....
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2006-09-12 135128
If I'm not mistaken the tach only has three digits on it so it might be 1759 or 6759 might all be possible unless you are familiar with this tractor since new. The blow by tells me the rings are leaking by and the most common cause of that often being premature is the neglected injectors. They from time to time will leak down and allow the lines to drain out into the engine when off often causing washed cylinders which will give you the blowby. They more then likely leak when the engine is running as well. Start with the injectors as from time to time some good hard running will break the glaze that develops from the injectors leaking if the problem hasn't been there to long. ....
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 | earthwrks
Join Date: Dec 2003 Posts: 3853 Home Office in Flat Rock, Michigan
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2006-09-13 135173
Art and Murf: If the injectors are faulty, and there is significant leakdown into the crankcase, that would mean the oil is diluted with fuel too, right? ....
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| Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2006-09-13 135177
Not to think that it would fill right up with fuel but yes the oil level will rise to a degree as every engine has a point where it will pass the oil. The oil will actually thicken rather then thin with the partially burnt fuel. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2006-09-14 135183
EW, you are correct, but bear in mind, even severe leakdown is still only a very little bit of fuel, maybe a teaspoon from all the injectors in total.
The two big hazards are, as Art pointed out, the washing down of the cylinders, and also of altering the oil, usually made worse if there is a blowby problem because of the unburnt fuel and carbon being added to the oil.
It would be money well spent in this case, IMHO, to send a sample of the oil away for analysis. The few bucks for the sample, together with a compression test, and fuel pump & injector check up sure beats the cost of an engine overhaul.
It could be nothing more than a sticky ring and a clogged injector tip. A bottle of Marvel Mystery Oil and an injector overhaul or replacement and she'd be good to go.
Best of luck. ....
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| rgpbeme
Join Date: Mar 2006 Posts: 55 Eureka Springs AR
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2006-09-14 135198
The tractor has new injecters and pump I have not had the tractor long so I am learning. I found the hydraulic pump seal was so fluid was leaking into the oil...The exhaust seems to be getting cleaner. I found out the best way to start it when it is warm. I pull both compression and gas levers. I hit the starter and when the exhaust is completly clean. I let go of both at the same time. The little guy started everytime.
I am going to have to joint I can only get about 1/2 of the return post.
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