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john deere 4840 starts hard

A

Anonymous-0

Well-known Member
i just bought a john deere 4840 tractor it starts hard smoking extremely while cranking over could the injectors be bad? injector pump?turbo?hrs are unkown runs great after i get it started
 
First thing would be to check compression, if ok then have injectors cleaned and set, then the pump. If it has been babied in cold weather the cylinder walls may be washed down and it just may need to be worked and worked hard for a few hours to clear it up.
 
How many hours are on it and what do you know about it's history. How good are the batteries and how well does it turn over. Checking the valve adjustment would be a very good place to start. Does it start any easier if you warm it up first with the engine heater? If it still stars hard when warmed up have the injection pump checked out. Needs to have good batteries, good compression, and good fuel spray at the right time to start. Always start checking the easiest and cheapest things first.
 
(quoted from post at 20:11:13 02/13/11) Using the block heater when temps are below 40F ?
Has somebody hammered the pistons,rings and sleeves with ether?
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Some people use the ether everytime, all the time. Make sure the bat, cables are good.
 
So as long as everybody does it. Doing something questionable or wrong is ok?
A block heater is far more sense than pounding an engine with ether.
 
(quoted from post at 08:27:42 02/14/11) are you suprised? 30/40 series are noted for poor starting and atrocious fuel consumption
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I think you should limit poor starting and atrocious fuel consumption to the 30 series(4230/4430) not the 40 series with the 466 cid engines.
 
Check the Nebraska test results. Deere was comparable to the other manufactures of the era. And while at it lets have a look at all the Deere's with the best or near best fuel consumption of any brand.
 
(quoted from post at 14:22:26 02/14/11) So as long as everybody does it. Doing something questionable or wrong is ok?
A block heater is far more sense than pounding an engine with ether.
Click to expand...

I was just making a comment about using ether. Should have also said: Using ether should be the LAST thing you try. Some old timers say once they get used to the ether, its hard to stop. :lol:
 
(quoted from post at 17:11:23 02/14/11) Some old timers say once they get used to the ether, its hard to stop. :lol:
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IMHO the reason engines get addicted to ether is broken top piston rings from from not injecting ether correctly according to instruction in operators manual. Ether is very similar to Brillcream "a little dab will do you"
 
(quoted from post at 00:15:24 02/15/11)
(quoted from post at 17:11:23 02/14/11) Some old timers say once they get used to the ether, its hard to stop. :lol:
Click to expand...

IMHO the reason engines get addicted to ether is broken top piston rings from from not injecting ether correctly according to instruction in operators manual. Ether is very similar to Brillcream "a little dab will do you"
Click to expand...

Tx Jim makes a good point. If I do use ether, I spray half a seconds worth.
 
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