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Tractor Talk Discussion Forum

Diesel blue smoke

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Bernie in MA

03-02-2006 14:30:43




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My son-in-law has a David Brown 990 that has suddenly started producing a lot of blue smoke. We had trouble getting it started a couple days ago and used ether sparingly 2 or 3 times, a routine thing in zero weather. The radiator fluid has dropped some, but not enough to cause overheating. Anybody have any input? TIA




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Bernie's Son-In-Law

03-04-2006 14:35:55




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
This David Brown is a diesel, not sure if everyone knew that. I looked at it today and it was down about 1 1/2 gallons of antifreeze. I checked the oil, added 5 gallons of fuel, and topped off the antifreeze. However, less than 5 minutes after adding the antifreeze, it started spurting out the overflow. It doesn't seem like it was even hot enough for the thermostat to open, but i don't know. Head gasket? Thermostat stuck ? I noticed the excess exhaust smoke the other day before the radiator problems. It doesn't just smoke upon start-up. At first, it just came and went, but now seems to do it all the time. The fuel filters have been on a couple years, but I use clean fuel and the tractor hasn't had many hours on it. But I'll check them. Also, the tractor does have a bolt on the intake manifold that can be removed so you insert a felt plug dipped in ether to start it in cold weather. I don't have that felt plug, so I usually just give a little starting fluid in the air cleaner. I know ether can damage diesel engines if used too much, but what damage does this do to the engine? Thanks for your advice.

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buickanddeere

03-04-2006 15:46:02




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 Re: Diesel blue smoke in reply to Bernie's Son-In-Law, 03-04-2006 14:35:55  
Odds are the use of ether has blown the head gasket or cracked the head or block casting. I've never seen a felt plug that gets soaked with ether? Around here we use an engine coolant heater and often a battery blanket heater. The engine starts easily like it was summer. Less engine wear & better fuel efficiency too. No worries about ether also bending rods, crushing bearings, breaking piston ring lands, pinched rings or broken rings. And the ether will also strip lube oil off the cylinder walls. Once an engine is ether damaged it becomes a poorer & poorer starting engine.

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buickanddeere

03-03-2006 10:37:04




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
Did anybody give her a snort of ether?



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Bill46

03-03-2006 04:57:13




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
Take it out and pull the stuffings out of it. Get her good and hot with all the load she can handle.
Bet you see a big difference in her. Also, get some clean, new fuel in her. This fuel we get today has a shelf life of warm milk.



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Jerry/MT

03-02-2006 21:28:44




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
Blue smoke sounds like lube oil to me. Does it only occur on start up? Could be leaky valve seals or guides. Oil drips down into cylinder after shutdown, burns off at start up. If it does it all the time, probably worn oil contol rings.



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joe e-tx

03-02-2006 18:18:34




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
check or replace fuel filters.next remove line from fuel pump to fuel tank and blow back with compressed air to remove setlememtat bottom of tank. sounds like running lean and burning oil off cylinder walls,had 995 do same thing.also cold start advance on disel db is tee knob on bottom of injection pump.turn in or up or clock wise for cold start
joe



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J. Schwiebert

03-02-2006 16:08:13




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 Re: Diesel blue smoke in reply to Bernie in MA, 03-02-2006 14:30:43  
First thing I would do is take the exhaust manifold off and see if all the smoke comes from exhaust port or it comes from all of them. After it runs a while especially if you work it so it warms up good doese the smoke go away? Cold be a fuel system issue or a compression issue. Questions?



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