2555 Horrable engine noise.

[bobbykroboth]

Need help with my 2015 2555. Started about 3 months ago at around 90 hours, now has 112 hrs. When engine speed is anything above an idle, I will make a horrable noise. I dont know how to discribe it other then maybe like sheet metal vibrating its ***** off. I can not pin point were its coming from other then the engine. This noise comes and goes during operation. Nonthing effects it, it does not matter if pto is on or off, or if tractor is moving or is not moving. If cluch is pressed in, or not. If any of the hydraulics are moving or not. Ive tried everything, the noise comes and goes as it see fit. No check engine light, but I plugged my scanner into the tractor, and the only thing i see is the intake air temp is reading -40. I replaced the map sensor and still reads -40 so it might just be my scanner i dont know. unless theres another temp sensor that im not seeing. Any of you guys heard of this? Please HELP!

 

[Chrisb009]

It could be a number of things...try to narrow down where the noise is located. It could be the hydraulic pump to an engine timing chain to a number of other items - without being near it and hearing it while in operation is a guessing game.

-Chris

 

[bobbykroboth]

Being it only does it at 25%+ throttle, theres already a lot of engine noise so its really hard to tell. and usually when I want it to act up it wont. But its very loud and noticeable when it does. Im thinking the -40 is messing with the engine timing and causing this?? Operating the hydraulics causes no change in the noise, does not make it happen or make it stop. I guess i could remove the belt and run the engine for a couple minutes, that would tell me right away what is or is not making the noise. Will do this in the morning.

 

[skipmarcy]

In automotive gas engines a temp sensor pegged low like that will cause lots of excess fuel to be dumped into the cylinders - maybe the same here ? Also in automotive the air temp sensor is SOMETIMES incorporated into the MAF but not always, could be separate in the air filter housing or ….

 

[duffer]

Since you said it sounds like sheet metal vibration, I'm going to suggest a different route. I get a similar sound on mine once in a while. I've pinned it down to 2 different places:
1. The pins in the front loader frame next to the ops station
2. The front loader jack stands.

Both are close enough to sound like engine noise from the seat. And you didn't mention anything about the performance going south, so hence my 2¢.

 

[Sergei1]

Since the noise is high enough to be heard over normal engine noise, I'd be looking at a pulley or maybe the alternator. Just your description makes me think a bearing going out.
One other thing is check and make sure all the mounting bolts are tight for the components that use the belt.

 

[PILOON]

Harmonic vibrations?
Possibly even a muffler baffle or similar such.

 

[rademamj1]

Probably dealer should take a look at it as a potential safety issue.

As engine rpm increases, a resonance vibration is being created. Could be anything from loose engine cover to fan belts. I have seen poorly adjusted fan belts make enormous noise...when they start slapping and screeching. Double check everything for tightness. Nothing can be loose. Make sure all fluid levels are good. I hate to think hydraulic fluid is down 50% or more.

 

[sd455dan]

Need help with my 2015 2555. Started about 3 months ago at around 90 hours, now has 112 hrs. When engine speed is anything above an idle, I will make a horrable noise. I dont know how to discribe it other then maybe like sheet metal vibrating its ***** off. I can not pin point were its coming from other then the engine. This noise comes and goes during operation. Nonthing effects it, it does not matter if pto is on or off, or if tractor is moving or is not moving. If cluch is pressed in, or not. If any of the hydraulics are moving or not. Ive tried everything, the noise comes and goes as it see fit. No check engine light, but I plugged my scanner into the tractor, and the only thing i see is the intake air temp is reading -40. I replaced the map sensor and still reads -40 so it might just be my scanner i dont know. unless theres another temp sensor that im not seeing. Any of you guys heard of this? Please HELP!

In most vehicles that sensor would be the IAT (Intake air temperature)

Without any tests done to isolate the noise, I would check the muffler and any exhaust shielding.
Bearings can make some pretty irritating sounds, have seen water pump and idler pulley bearings do this.

Subscribed Good Luck,

Dealer should be all over this.

ps. In cold weather a hydraulic pump can make some really irritating noises, ESPECIALLY if there are any pump intake side air leaks or restrictions.

 

[bobbykroboth]

I bought it in 2015 so im sure its out of warranty. Plus every time ive called to set up and appointment, they act like they are so busy for weeks out. I did an oil change at 50 hrs, and again at 100 hrs. So today the outside temp is 60, and it does not act up at 60 degrees. I know it sounds like im making this up. I got it to make the noise a couple times, but was not loud enough to hear over the wind on the videos I made. I also removed the loader, and belt, so i can say its not the loader, belt, alternator, or the water pump. Sounds like its coming from the Front of the engine, but thats also the only part I can get my head next to. :confused2: I will say, that the 30 mins of me revving it up and down in the drive way, trying to get you guys a decent video. At one point I heard a very faint humm coming from the egr valve. Humm went away after a few more rev's, and so did my noise! Noise is complete gone " im not holding my breath" , but maybe the egr valve was stuck and straving the engine of fresh air,? but then i would have lots of smoke i would think. Give me a day or two and ill report back. Im sure it will back back, just not on 60 degree days! :laughing:

 

[rademamj1]

Get some EGR cleaner and remove any carbon deposits that may build up and cause issues with an EGR valve.

 

[Reb954]

When I bought my 2565 it had some issues for the first few months. Apparently they had some problems with the EGR system so Mahindra replaced the whole system with a redesigned one. It has worked fine every since.

Also, when I bought mine in 2017 they had a 7 year warranty so you might check to see how long your warranty is/was.

 

[Chrisb009]

This is an interesting problem...I’d be leaning towards the egr if the noise seems to be coming from that area. The post from Reb954 provides some legitimacy towards the egr being the possible culprit.

-Chris

 

[Sergei1]

This is an interesting problem...I’d be leaning towards the egr if the noise seems to be coming from that area. The post from Reb954 provides some legitimacy towards the egr being the possible culprit.

-Chris

There is sure one advantage to having an older tractor, no emissions control, no computers and just a plain simple diesel engine.

 

[mikeman1]

i noticed a noise on my engine too at certain times, load/no load, rev it up or down. i sprayed a little silicone on the fan belt to see if that was it and it was since i didnt hear it again all day. just needed to tighten it up a bit.

 

[bobbykroboth]

After talking with you guys the noise has went away. But I also Haven't ran it very much. Looking deeper I checked out the egr valve and it appears normal, an no major build up. On Monday for experimenting reasons I removed the intake air restrictor at the egr valve and installed a block off plate at the egr valve. Going to mow the pasture tomorrow now that weeds are growing and see what happens.

 

[bobbykroboth]

Update. The noise come back soon after I said it went away but this time I found where its coming from. Its coming from the injector pump. If I unplug what im going to call the fuel pressure regulator that sits on top of the pump the check engine light comes on and the tractor will idle rough, but anything above idle runs perfect. So I replaced the fuel pressure regulator and was shocked by what I found. Lots of dirt collected on the regulator screen and inside the housing. I cleaned out the housing and installed the new regulator. Hoping for nice quiet operations, I was quickly disappointed once i got past appx 1500 rpm the noise was still there. Tractor only has about 120 hrs on it, and runs fine, just horrible sound. Surly it doesnt need a injector pump!? Tractor has always had fresh clean diesel with diesel additive. HELP!!

 

[rScotty]

On 2007-2014 Kubotas, the EGR valve is turned on by a combination of turbo pressure and engine temperature. You can block the tube on the side of the EGR valve to temporarily turn off the EGR.

Reading a little farther, I'd be tempted to take out the injectors - not the pump - and have them tested.

 

[bobbykroboth]

OK, I guess I could unplug 1 injector at a time and see which one makes the smallest difference? That would propably be my bad injector right? I just find it funny it runs so perfect if I unplug the fuel regulator control thing.

 

[bobbykroboth]

OK, so i removed the hood and dug down a little deeper. I unpluged each injector one injector at a time and each had the same effect. Loud rattle would start at about 1300 rpm, and rev up to 2200, then slowly drop down and settle at about 1500. Tractor would not even attempt to run on one single injector. Just because I was right next to it, I desided to unplug what im going to call the Rail pressure sending unit. With rail pressure sensor unplugged tractor ran the exact same as it does when i unplug the fuel pressure regulator. Little bit rough idle, and very quiet through out the rpm range. So since i just replaced the pressure regulator im going to order a pressure senser also. It has to have something to do with fuel pressure! What do you guys think, am I on the right track?? Maybe i just dont need these extra parts...

Update, looks like this is the same part used on 07-11 dodge cummins fuel rail, and is a very common part to go bad. maybe ill get luckly