2555 Horrable engine noise.

[rScotty]

My apologies, I thought that since it was a Mahindra it wouldn't be as completely computer dependent as some other tractors. I'm not sure why I thought that, but my mechanical advice is based on the older straight mechanical tractors.
However, I assume if your engine is basically being run by the computer, it also must have a read out port or screen that provides diagnostic info. What messages are you getting? Error codes?

Alternatively, most sensors are just variable resistors providing information in the form of a varying voltage to a control computer. You can always put a VOM with a high input impedance in parallel with the sensor and see if its values are going irratic when you hear the noise.

In your case, it sounds like you are now on the right track, but I wonder if it is more likely to be actual fuel pressure or simply a bad fuel pressure sender?
rScotty

 

[bobbykroboth]

Yes, mahindra is a common rail diesel so the computer does operate the engine. The only thing mahindra does not have is the DPF, which is the reason I went with this tractor. No read out screen, and no check engine light/codes, unless im causing them by unplugging stuff. Napa has the fuel pressure sender, so on my way home from work ill be picking it up. Will keep you posted.

 

[bobbykroboth]

This is not what i wanted to see in my common rail. Full of rusty color material. I think its is whats called THE BUG, but it appears dead and wipes off easy. But why would it be stuck in my common rail and not flushed out? I removed the complete rail and it easly cleaned up. I replaced the rail presssure sender and not much of a difference to say for sure, maybe a little improvement. Next i guess the fuel pressure over pressure valve at the other end of the common rail. Id like to change the fuel filter but mahindra no long stocks any parts and may take a month to get so ill be deleting the mahindra filter and installing a common cat filter.

 

[bobbykroboth]

Maybe im posting in the wrong area here. but I got lucky and fixed it today.

 

[pjwest03]

What was the final fix, if I may ask? My 2555 is exhibiting a similar behavior.

 

[5030]

Since when can you plug an OBD scanner into any tractor diagnostic port? News to me.

 

[bobbykroboth]

My Mahindra will shut off if you plug anything into the obd port. The fuel regulator thingy at the rear of the common rail must have been bad. Replace it and all is good. Found it on eBay and was shipped from Italy.

 

[pjwest03]

Thank you!

And yes, the OBD-II scanner does shut the engine down if you try to get codes while its running. You can get get and clear codes with key on engine off. There are a lot of private codes being used and some standard ones. You can also get the sensor data. The ambient temp sensor always reads -4. They are using a non std format that the scan tools don't grok.

 

[mrmeseeks]

Hello, do you have any more details on the part? maybe a part number or better description? I think that mine is doing the same thing, makes a terrible noise at mid-high rpm sometimes that could almost be a belt squealing. Also wont do it when I want to show someone! I would like to try the part you found.
Any help is appreciated.