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John Deere Tractors Discussion Forum
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Blue Smoke - 4320

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2510Paul

04-20-2008 03:49:19




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We started up the 4320 yesterday and put the plow on. This tractor has always given off blue smoke since we got it, seems a little more now. The exhaust smoke starts off grey when started but turns to blue as is warms up and continues that way. The tractor is also a hard starter, needs ether or to be plugged in below about 50-60 F.

What is the blue smoke indicative of? Injectors? Valve? I would appreciate your comments. Paul in Wisconsin.

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2510Paul

04-21-2008 18:22:43




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
Thanks again for the comments. Next winter it will get a top end overhaul including injectors and pump.

Thanks again. Paul



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44 diesel tech

04-23-2008 18:15:34




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-21-2008 18:22:43  
Paul, You got a lot of good comments, but the first thing you should do is advance the pump timing 2 to 3 degrees. Scratch a mark from pump to engine block and separate mark about the thickness of a quarter. Move top of pump toward you.The factory told us to do this on 4230 models. This might help to correct both problems.



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buickanddeere

04-21-2008 05:38:31




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
The 20 series tended to leave a haze of blue smoke at the best of times. One batch of fuel vs. another can make a difference. Getting the injectors peaked and tweaked to pop at max rated pressure with new tips will help some. Timing should be tested on a dyno to find the ideal setting. If somebody did a "valve job" they knocked a point or two off the compression. Excessive piston to head clearance. And valve recession due to grinding the valves and seats will make cold starts impossible without pre-heating and either.

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71 4320

04-20-2008 15:07:15




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
JD engine manuals don't mention blue smoke but gray or black smoke indicates incorrect timing, improper fuel grade, engine overloaded, excessive fuel delivery, faulty injection nozzles, restricted air cleaner, defective muffler or defective turbocharger. White smoke indicates low engine compression, faulty injection nozzles or improper fuel.



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2510Paul

04-20-2008 12:10:05




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
Thanks for the comments. I just thought I would follow-up, the engine does not use oil nor is there much blow by so I guess the problem is valves and/or injectors and/or pump.
One additional piece of information, I did a JD Oil Scan of both the engine and transmission oils this winter and both checked good.
Thanks again. Paul



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Edpap

04-20-2008 10:03:27




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
Hello Paul,
61-4010 is right. a few thoughts. does the engine use oil? does it have a lot of blow by? if not I would look to the head. if it does than you might be looking at more. I know when I do a JD engine the most imortant thing for good starting is valve recession in the head it must be at the high end of spec. I just looked that motor up it should be a 404 turbo. check the hose from the turbo to the intake if it has oil in it, the turbo is bad, that won't couse hard starting but might give you blue smoke I can get you whatever you need for that engine even a complete kit with the rings installed.
one thing to keep in mind is that is a big heavy head and hard to handle. The bolt tourque is very important I always run the engine till its warm and retourque the head.
Good luck Ed

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RobMD

04-20-2008 09:51:31




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
IN addition to FIT's message, I think that if you have to plug in the tractor at anything below 60 degrees, then there must be a compression issue. I think there is a possibility you're plumb wore out.



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F-I-T

04-20-2008 08:41:25




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
I always started with the assumption that white smoke was moisture, black smoke was fuel, and blue smoke was oil. If she's a hard starter, that can indicate low compression, and many diesels can still do a good days work with low compression, just that once they warm up, they get by, so the gray smoke is probably black mixed with blue, then it warms up, the compression increases a bit, the retained heat increases, and the blue smoke is what is left. Sounds like rings/valves/etc. As was said, if you rebuild it, have the nozzles/injectors cleaned and calibrated for cracking pressure and tested for pattern, and the pump looked over.

Good luck on it.

Frank

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61-4010

04-20-2008 04:23:49




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 Re: Blue Smoke - 4320 in reply to 2510Paul, 04-20-2008 03:49:19  
Howdy Paul in Wisconsin.

Blue smoke can be caused by a variety of things including bad injectors, poor compression and valve issues. There is also a chance that your injector timing may be off too.

When was the last time the tractor was rebuilt? I am suspecting that if it's been awhile, that you're probably looking at low compression which is why it's hard to start and blowing blue smoke when she does fire/run.

Just a few suggestions if you decide to over haul her. First, get a geuine JD Kit. These have the pistons/rings already installed in the sleeves. Secondly, have the head reworked too. A good machine shop can check the valve wear, guides and seats. Lastly while you have the motor apart, bring the injectors to a repair shop and have them clean/test the injectors too.

Around my area, many guys don't have the injectors checked/cleaned. Nothing worse than having the entire motor rebuilt only to find that the injectors are having issues too. Then you find yourself taking things off again. Your injector shop may also be willing to look at your pump at the same time and let you know it's condition.

Good luck and keep us posted!

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