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New Holland 90hp Blue smoke at high rpm - NO LOAD only

2

2MaineFarmers

Member
2008 NH T4050. Tractor starts up as soon as you touch the key. Idles great with no smoke at all. As RPM is increased, let's say over 1500, blue smoke starts to roll out. If the tractor is sitting at 2300rpm without a load, it's blowing enough smoke to really choke you out. Almost as blue as the tractor. As soon as you put a load on it, the smoke starts to decrease. The greater the load, the less smoke. It's a 90hp pto tractor and with my 75hp min disc mower, there is little to no smoke. When I am running my baler which only needs 40 hp, a person on a kicker wagon can barely breathe.

I'm not a big diesel mechanic. I replaced my injection pump and timed my old allis but that is about the extent of my ability. Just trying to see where to start. I guessed rings or valves but it starts up better than my car so I really don't know. Thanks in advance for any help.
 
How is the oil consumption? Or is it making oil and now overfilled?

Be sure the oil is good, not fuel diluted, or overfull (it can also overfill from hydraulic oil if there is a gear driven pump, or the wrong dipstick). Oil dilution is usually an injector problem, pump seal leaking, or the lift pump leaking into the crankcase if equipped. There can be other internal fuel leaks depending on the design.

No load oil burning smoke is usually valve guides IF there is enough oil up top to run down the guides.

I assume this is not a turbo, but if it is the seal can be leaking.

Oil rings can be bad and still have good compression to start easy, but bad oil rings will cause oil consumption, and smoke worse under load. Bad rings are usually a gradual change, if this started suddenly without loss of compression or performance I would not suspect rings yet.

I'm only using generalizations, your engine may have a specific quirk that I am not familiar with, so maybe someone with direct experience will come in.
 
(quoted from post at 15:43:35 08/14/21) Have you tried changing fuel filters?
Click to expand...

I have a fuel filter on the shelf so I can do that. I did oil and filter changes shortly after I got it last year with no change. I'll put that on the list for next weekend.

It is a 4.5L 4 cylinder turbocharged diesel. Oil level has stayed pretty consistent, but doesn't look a lot thinner. I know that doesn't make a lot of sense if it's burning oil. Let me check it tomorrow and report back. Wife ran it for two hours mowing today but that's when it burns the least. It takes 10 quarts of oil and when I changed it last fall I used 2 quarts of engine restore and the rest was rotella T6 15w40.

If it was an injector that was always leaking I feel like it wouldn't idle clean. I'll do a few things over the next week, research in to valve guide symptoms and report back. Appreciate the help.

Edit: just FYI I bought the tractor at auction last year. Been like this since I got it. Has 1400 hours, meter works and body condition is fair so probably accurate.

This post was edited by 2MaineFarmers on 08/14/2021 at 08:25 pm.
 

could it be a ""thermo-start"" leaking fuel into the manifold so its "rich" till you load it?? or a dribbling injector doing same?

can you open one injector line at a time and see if it clears on that cyl or smokes on all?

Is this a computer control system?? with a maf and other sensors??
 
After ~25 hours of run time the oil level is perfectly between the high and low marks, which means it's down 1.5 quarts from full.

I did put new air filters on it last fall. No change.

Fuel filter looks like it's pretty new but I will change that before too long.

Being a 2008 I believe it is all pre emissions but is pretty well completely co.puter controlled. I do not know if I can pull one injector at a time. I will have to research in to that to figure it out.
 

Dont pull the injector, loosen the line on the injector... one at a time, with a wrench,, not your hand!!.. this will temporarily disable that cyl,, and see if then it clears up...if it does, then that cyl/inj is the culprit... retighten the flare and then move to the next one.
 
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