2015 SVL90-2 Loud Hissing from Engine Compartment while running

[Chieftan]

Hi All - Any insight would be appreciated. Checked around the forum but does not appear to be anything related to my issue.

Here is the background, operating the unit, reduced power noticed, then regen kicked in (I think this is just coincidental), but within 5 mins , hissing started, the machine threw an E9310 and stalled. Noticed bluish soot on the inside of exhaust pipe.

Let the engine cool. Started it fine, no codes, but the hissing is still there. Let it run at low idle, regen started again, this time left it alone and it completed within 25 minutes. All with the hissing still going on. No unusual or white smoke out of exhaust during this process , no error codes.

After Regen completed, still hissing, throttled up and immediately saw abnormal smoke out of exhaust. Shut it down.

I'm starting to check hoses/connections for this hissing which seems to be coming from the rear left side, hard to tell as it is so loud when operating, between engine noise , the hissing is as loud if not louder than the engine.

Coolant lines are fine - any thoughts about exhaust or turbo leaks - checking on those hoses/connections next.....

Thoughts?

 

[North Idaho Wolfman]

Take a video/audio of it doing it and post it on youtube and give us a link to see/hear it.

 

[Chieftan]

Here are two videos, one at min throttle and the other at max throttle. Both close in on the area that the hissing is most prevalent and where it appears to originate.

Links updated:

Max Throttle Hiss

youtube.com

Min Throttle Hiss

youtube.com

I can operate the unit, tracks and loader, but it is clearly under powered , and has trouble climbing even a slight incline.

 

[whitetiger]

Check the intake manifold where the AC bracket bolts onto it. You may have a broken manifold.

 

[Russell King]

I can’t see the videos, they are “private”

 

[Chieftan]

Updated video links

Min Throttle Hiss

youtube.com

Max Throttle Hiss

youtube.com

 

[Russell King]

I would look at any canister on the exhaust side of the emissions system. It seems that something may have been clogged and possibly split. It could be a partially disconnected hose.

Odd that you are not getting error codes though but maybe the sensors are happy for now.

Does it have any turbo charging system?

 

[Chieftan]

Thanks for the feedback. Yes, it has a turbo.

 

[Mitjam]

Hi All - Any insight would be appreciated. Checked around the forum but does not appear to be anything related to my issue.

Here is the background, operating the unit, reduced power noticed, then regen kicked in (I think this is just coincidental), but within 5 mins , hissing started, the machine threw an E9310 and stalled. Noticed bluish soot on the inside of exhaust pipe.

Let the engine cool. Started it fine, no codes, but the hissing is still there. Let it run at low idle, regen started again, this time left it alone and it completed within 25 minutes. All with the hissing still going on. No unusual or white smoke out of exhaust during this process , no error codes.

After Regen completed, still hissing, throttled up and immediately saw abnormal smoke out of exhaust. Shut it down.

I'm starting to check hoses/connections for this hissing which seems to be coming from the rear left side, hard to tell as it is so loud when operating, between engine noise , the hissing is as loud if not louder than the engine.

Coolant lines are fine - any thoughts about exhaust or turbo leaks - checking on those hoses/connections next.....

Thoughts?

Prob a long shot but have you checked your intercooler and hose and clamps from turbo and back to intake. Hissing could be charged air leaking and throwing a code and causing loss in horsepower

 

[whitetiger]

Prob a long shot but have you checked your intercooler and hose and clamps from turbo and back to intake. Hissing could be charged air leaking and throwing a code and causing loss in horsepower

The SVL90-2 does not have an intercooler.

 

[Mitjam]

The SVL90-2 does not have an intercooler.

Scratch that then.

 

[Chieftan]

Just wanted to provide an update on this thread. After dismantling, the Kubota shop found the DPF clogged beyond the capabilities of Regen. I had the DPF and related exhaust components sent to a restoration shop. They determined the DPF was internally cracked - source of the loud hissing, and beyond repair. Other components were placed in the kiln and cleaned/tested. Bought a new DPF from Kubota. All was reassembled and the problem with operation/loud hissing/limp mode were resolved.

Should I have any concerns about the future regen function of the machine? Asking because while the DPF was found to be cracked, I'm wondering if it was caused by excessive heating / reduced air flow / operation with the clogged filter , I believe this to be true. And so, did the machine initiate Regen properly in the past to ensure DPF was cleaned sufficiently ? I understand the control module determines when regen is necessary, assuming this is based on the multitude of sensors attached and cannot be manual started by the operator. Going to see if I can find some specs on the number of expected regens per 100 hours of operation so that I can keep tabs on this.....