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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8483
Experience:  I am ASE Master Truck Certified.
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Cat C13 DPF retrofit problem

Customer Question

Cat C13 DPF retrofit problem
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Expert:  benjamin Schaeffer replied 11 months ago.

Hi my name is Ben

Can i get a little more info from you is there a d.oc. in your after treatment system as well or a dpf only. and what kind of driving does this bus do?

Customer: replied 11 months ago.
No just a DPF we have to remove it and bake it when it gets full. Highway to Mountain driving. I can keep it local on flat land and it will fill up the filter.
Customer: replied 11 months ago.
You can see it blow smoke out whenever you apply the throttle.
Expert:  benjamin Schaeffer replied 11 months ago.

has the turbo been inspected? as well as the charge air system for leaks.

Customer: replied 11 months ago.
they look good and no leaks.
Expert:  benjamin Schaeffer replied 11 months ago.

after the retro fit was the ecm calibration changed to the proper one?

Customer: replied 11 months ago.
This coach had The filter for about a year with no issues when we did and in the inframe rebuilt and we only changed the injector codes and that's when the problem started
Customer: replied 11 months ago.
It started right after the rebuild, then we changed the injectors and codes
Expert:  benjamin Schaeffer replied 11 months ago.

are you getting any kind of residue after the turbo more than normal

Expert:  benjamin Schaeffer replied 11 months ago.

Will the truck complete a stationary regen without any codes?

Customer: replied 11 months ago.
It's an aftermarket filter no regen, no oil
Expert:  benjamin Schaeffer replied 11 months ago.

It will have to be able to do some kind of a regen on a dpf filter as it needs to clean itself. it usual should be doing it when you are at highway speeds for a prolonged time.

Do you have access to a cat oem engine diagnostic software.

Customer: replied 11 months ago.
but this is a retro fit filter no regen system. This is a 2006 engine.
Expert:  benjamin Schaeffer replied 11 months ago.

Ok as i am not too familiar with retro fitted dpf systems i will be passing this off to another experts?

Sorry i was not able to help you futher.

Best of luck

Ben

Expert:  Cat Man replied 11 months ago.

Thanks for asking your question. I will try and help you out.

Can you get me the engine serial number please?

When you say the DPF is getting plugged. Is it getting plugged with soot? Oil? Fuel?

Customer: replied 11 months ago.
KCB78410, with soot
Expert:  Cat Man replied 11 months ago.

Thanks for the information.

The KCB C13 does not need a DPF. The KCB has no regen system. It's a pre emissions engine. All it needs is a muffler. If there is a DPF on the engine it will fill with soot. The engine has no way of getting rid of soot in a DPF. DPF's can only be used on C13 with a serial number LEE.

Please reply back if you need more help or have more questions. I am happy to assist.

Customer: replied 11 months ago.
in the wonderful state of California you have to have a filter on the engine.
Expert:  Cat Man replied 11 months ago.

Thanks for the information.

Yes California does require DPF's. A DPF is designed to collect soot. The soot must be encenerated. This can only be done with a regeneration system like on the later engines. Has anyone installed a regen system on the engine?

Customer: replied 11 months ago.
No they can only put the aftermarket filter, they dont make a regen system. We have them on our cummins engines and they dont have a problem. This problem started after we rebuilt the engine 4 months ago.
Expert:  Cat Man replied 11 months ago.

I see. Thanks for the information.

What all was changed during the rebuild?

Also. Why was the engine overhauled?

Customer: replied 11 months ago.
Pistons, Rings, Liners, Head, Injectors, Actuators, Basically a major overhaul but a in frame. It caught fire on the exhaust manifold side.
Expert:  Cat Man replied 11 months ago.

I see. Thanks for the information.

Was the DPF replaced also?

Expert:  Cat Man replied 11 months ago.

If the DPF worked before the rebuild. There are two things I would suspect.

The first is to verify the correct parts were installed in the engine. If the wrong injectors, cam, pistons, or turbos were installed. The engine may produce too much soot.

If you confirm all the parts are correct. I must suspect the DPF. If you had the DPF baked or cleaned. That does not always fix a DPF. Especially after a rebuild. If oil got in the DPF. It will cook solid and can be cleaned.

Customer: replied 11 months ago.
had the DPF checked and no oil or fuel was found. The turbos were not replaced but have been checked and working ok.
Customer: replied 11 months ago.
We updated the trim codes on the injectors, Could the turbos cause this issue?
Expert:  Cat Man replied 11 months ago.

Thanks for the information.

Yes the turbos can cause this is there is excessive endplay in the shafts. This can cause low boost and soot.

Customer: replied 11 months ago.
we dont have a boost issue.
Expert:  Cat Man replied 11 months ago.

I see. Thanks for the information.

Then I must suspect the DPF. It's either faulty with to low of a capacity. On backwards. Or the incorrect DPF for the truck. It's all that's left.

Please reply back if you need more help or have more questions. I am happy to assist.

Customer: replied 11 months ago.
We can see smoke when you apply the throttle or when it shifts, Is there anything that would cause that or that is just how a cat runs?
Customer: replied 11 months ago.
Can we turn down the injectors to slow the fuel down when the throttle is applied?
Expert:  Cat Man replied 11 months ago.

That's just how they run. There will be some smoke.

Unfortunately there is no way of turning down the injector. I am sorry. I wish there was.

Expert:  Cat Man replied 11 months ago.

Sure no problem. Let me look it up. Cat does make two TPS. The one you need is an 8 volt. But they make a 12 volt for PTO control. Be back in a minute.

Expert:  Cat Man replied 11 months ago.

Cat makes a long pigtail 8 volt TPS and a short pigtail.

The long pigtail part number is(###) ###-####/p>

The short pigtail part number is(###) ###-####

Not sure if you have the long or short one.

Please reply back if you need more help or have more questions. I am happy to assist.

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