Glad you enjoyed it!

That's a lot like the scheduled regeneration that your car does to burn off the soot deposits.

I hope it helps you out!

Hi, even with full removal and chemical cleaning, there is still a bunch of inert glassy products that come out at the end of the process with a water back-flush. It is for that reason that I believe an in-place ash clean can never get everything 100% clean. The in-place cleans are a good 'maintenance clean', and will probably extend the life of the filter by at least 2x if they are done every 2 years. I haven't really gone down that path because there is usually some other issue that needs addressing that requires the DPF to be removed (like a turbo issue), so the removal part is already done. I haven't dismissed the idea, and I might do it to a friends car at some stage ;-)

Hi, overnight in an industrial oven is the standard way way for truck and bus DPFs to be cleaned, so this video was to show that not everything is DIY compatible. If you were wanting to do a home DPF clean, then my other video is still my favorite method: kzfaq.info/get/bejne/gqthldKLmMzMfJs.html

:-)

Hi, nothing much can help this method as it is no substitute for an industrial oven.

Hi, thanks for watching my vids! it is a super tricky balance when it comes to cleaning methods that are safe to use on DPFs that have an integrated catalyst/DOC. High pressure water blasting could be done really carefully to not damage the ceramic binder material, but it will definitely blast the platinum right off the Diesel Oxidation Catalyst, so you could only do it where you had good access to the exhaust end of the filter, and only applied the high pressure to that end. Ultrasonic cleaning might be a good option if you get a large enough machine - and I'll be doing some testing on that very soon (I know that some specialist companies already use ultrasonic cleaning on DPFs). Acids are the perfect thing to react and break down ash deposits, but if they are in strong concentrations then they will also (depending on the acid) attack the steel or stainless steel case or attack the materials that make up the catalyst. I go for a 5-7% strength HCl and a 30 minute time limit so any attacks on metals are minimal, but that the ash is still broken down, and I figured that HCl was available in almost all countries as it is commonly used for cleaning brickwork and masonry. Strong acids like you have mentioned are best kept away from the catalyst, and I know from testing that if you dilute phosphoric acid down to 5% then it doesn't dissolve the ash deposits at all - so you can see what I mean about it being a bit tricky... I have received suggestions that diluted nitric or sulfuric acids will work well - but I suspect that they are both impossible to buy in most countries, and so I haven't done any testing on them.

@@StevenBTuner Thank you for the reply. I might be able to get my hands on 13% HCI. I am planning on diluting it 1:1 and repeating the process from one of your videos. BTW this ultrasonic cleaning sounds interesting so I am looking forward to see the results.

@@atti0808 That would be perfect - I'd love to hear how it goes!

Hi, you will need to take the DPF off the car. Get some sodium hydroxide (drain cleaner) and mix 200 grams in a liter of warm water and then add 50 grams of dishwashing liquid. Give it a good shake. You might need to repeat it a bunch of times before it is fully cleaned, so maybe buy 2 Kgs along with a couple of bottles of dishwashing liquid. Wear gloves and protective glasses as you don't any of that stuff on you!

@StevenBTuner thank you so much I will give it a go 👌

Hi, I believe it to be around 800 degrees Celcius / 1500 degrees Fahrenheit for 6 to 8 hours - but I'm sure that there is a lot of variance out there. The main thing with using an industrial oven to remove the soot from a soot blocked DPF is that it has to get over 600 degrees Celcius / 1112 degrees Fahrenheit in order for the carbon to combine with oxygen to form carbon dioxide. After the DPF has cooled down it is usually given a blast with compressed air to blow out any remaining residue.

Hi, too much heat will also melt the glass fiber insulation, so chemical and ultrasonic cleaning methods are a much better idea!

Hi, super high temperatures and plastic are never going to be a good combination!

@@StevenBTuner haha. Ya. Assuming the manifold is not plastic. Idk actually what or how my 08 3.0L grand cherokee diesel manifold looking like. But per some videos I saw I think its cast iron / steel

@@nometalgearr I don't think you understand just how much energy it takes to cook carbon off. Your intake is going to be hydrocarbons (oil) and carbon. In addition it is more than just temperature. Oxygen must be present or nothing will be oxidized.

Hi, I think that thermal expansion is going to be a huge risk regardless of which end you work on the most.

I'm glad I'm not the only one! :-)

Certainly is.

Hi, thanks for watching! The channels in the ceramic material are blocked at opposite ends in order to force the exhaust gases through the walls of the filter (DPFs are also called wall-flow filters), which means that you can't push anything all the way through to clear out the soot or ash. Also the fine matrix that catches the soot is microscopic, so can't really be cleaned my any mechanical method unfortunately.

@@StevenBTuner I've been watching your channel since the first video, you are doing a great job. I will definetly try the chemical method when will be the case.

Thanks! I hope you'll report back how the cleaning goes!

Nasty indeed - much better to chemical clean a DPF.

Hi, if it is long term ash deposits that you are trying to get rid of, then high exhaust temperatures aren't going to make any difference.

Everything about this technique is flawed and not recommended. Chemical and ultrasonic are much better ways to go about the ash removal process.

Haha, nothing that can't be fixed...

Very true!

I don't think that there is a safe way to do this job.

Hi, that is not obvious to a lot of folk...

They pack a punch for sure!

😂 that's hilarious lol

Hi, the uneven heating did cause the cracking - but it still didn't get rid of the ash... Other cleaning methods are a lot safer and more effective.

Hi, thanks for watching! Too much temperature...if an engine got that hot the exhaust valves would burn out and parts in the turbo would be destroyed.

@@StevenBTuner i ment what you was doing was good with the roofers torch mabe if you had it fan assisted it might clear it through

@@joken8901 I think it would have worked a lot better if there was good access to both ends of the ceramic, but most cars have the DPF enclosed with only a pipe going in and out which makes it very difficult to evenly heat it with the gas torch. For the moment I'll be sticking with my 2 stage chemical cleaning method: kzfaq.info/get/bejne/gqthldKLmMzMfJs.html

@@StevenBTuner yes ive watched your chemical cleaning vids they are very well done you are a caring and patient man and dedicate your time and money to show others the best and worst methods to use so the dont get ripped off by the main dealers who are not real mechanics like your self but are fitters 1 off 1 on but dont know how they really work, keep up the fantastic work

Hi, if it was a good process then there should be well over 100 grams of difference.

@@StevenBTuner what are the increments on the scales. average bathroom set would easily be + or - 100grm

Hi, they are kitchen scales accurate to 1 gram.

Transition takes time, so we may as well do the best we can with the millions of existing vehicles.

Yes, and a lot of cars have cracked DPFs when they get a lot of miles on them.

Hi, thanks for watching! I take a lot of viewer suggestions on board - some of them are awesome, and some not-so-awesome... If this video stops one other person from ruining their DPF due to heat stress induced cracking then I consider it to be a success, don't you? Not many folk have an industrial oven tucked away in their workshop, so they may be tempted to do something like this. Just a quick correction: soot doesn't turn into ash - soot is pure elemental carbon, and combines with oxygen at 600 degrees celcius to form CO2 gas (carbon dioxide). So let me get this straight...you are saying this is a stupid idea, and I am saying this is a stupid idea - so what is your argument?

@@StevenBTuner i was thinking of doing it till I saw the video, I would buy a new one but apparently its discontinued on my grand Cherokee so trying to think of ways to clean it and save it. Tuning is also not an option Noone tunes the Cherokee I have anymore. Thanks for the video saved my from destroying my vehicle.

@@VItimmyy Hi, my 2 stage chemical clean is still the best and safest method I know of so far: kzfaq.info/get/bejne/gqthldKLmMzMfJs.html

What a very unfriendly and rude comment!

Hi, if you have an integrated catalytic converter, then a pressure washer will blast the platinum right off the cat.