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  #1  
Old 09-27-2014, 06:09 PM
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Do not get water in your tailpipe

This rash of failed Catalytic Converters may well be caused by thermal stress or clogging due to water in the tailpipe! Look under the back of our vehicles. It is a continuous downhill path to the cat. Any water will settle in the cat and could damage it. Also, water getting to the cat while it's hot could cause cracking of the Catilytic element. The cat is 600F after being driven and will be 1200F if it is regening or just finished. When you shut down, the cat temp actually rises due to lack of airflow then cools very slowly. It can take 30-40 minutes or more to drop from 1200F back to 200F if the vehicle isn't running.

I'm not sure how the mufflers are chambered but they tilt down and water could very well flow back through them.

So....do not under any circumstance spray water in the tailpipe! We must assume it can flow down to the cat and damage it. Period.

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  #2  
Old 09-27-2014, 07:19 PM
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Re: Do not get water in your tailpipe

What about Bananas?
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Old 09-27-2014, 07:24 PM
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Bananas sounds like a better idea... I was going to mention drilling a hole in the cat to let the water out...
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Old 09-27-2014, 07:47 PM
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Re: Do not get water in your tailpipe

Funny...until your check engine light comes on. You can fill it up with whatever ya like. it's covered under warranty as long you don't mind waiting 3-4 weeks for parts.

Btw, I'm not talking about rinsing out your tailpipes...that's obviously bad. I'm saying a quick spray from a high pressure hose could be damaging. There is a rash of failures with P20EE codes and I doubt it's just a quality control issue. Something is causing it.
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Old 09-27-2014, 09:47 PM
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Re: Do not get water in your tailpipe

I actually didn't read anything you wrote, I simply saw the subject and thought of this:

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Old 09-27-2014, 10:23 PM
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Re: Do not get water in your tailpipe

Man thats some theory that I fail to believe. .
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Old 09-27-2014, 10:58 PM
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Re: Do not get water in your tailpipe

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Originally Posted by nicjak View Post
Man thats some theory that I fail to believe. .
Have you ever cut a converter open? They typically have a honeycomb structure with tiny holes made from a thin ceramic - like substance. I doubt it would survive being quenched while hot.

Don't buy it...get your diesel GC good and hot and fill'er up with water. Let's see what happens.

The last thing I did before I got a P20EE "Catalyst below effiency" code was wash it with high pressure water during a trip. Yes, it's a theory...one that I can't afford to test...but until you get a converter failure like many are having, can you definetely say it's ok to get water in a 600-1200F converter?

---------- Post added at 09:58 PM ---------- Previous post was at 09:40 PM ----------

http://www.agcoauto.com/content/news/p2_articleid/167

Explains how sudden cooling cracks the honeycomb. Even driving through deep water causes rapid cooling and potentially cracking the honeycomb.
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Old 09-27-2014, 11:37 PM
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Re: Do not get water in your tailpipe

Mate I run a diesel workshop lol anyone that washes the inside of there exhaust has some real issues.
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Old 09-28-2014, 12:26 AM
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Re: Do not get water in your tailpipe

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Mate I run a diesel workshop lol anyone that washes the inside of there exhaust has some real issues.
FYI...my truck that gets its pipes washed" has 4" chromed duals to a single 5" pipe that is all 3 feet below the turbo and down pipe. There is nothing that can be damaged. The chrome tips get pretty nasty so I wash them. Water goes in, drains out as I rinse the gunk away. No cats or muffler to damage. The diesel GC is a different story...lots of fragile components in the exhaust system.

I'm glad you are a technically competent. So what is your opinion on our high catalytic converter failure rate. I've been reading and thermal stress is a major cat killer. There is a widespread problem on our diesel GCs. Any input would be helpful...
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Old 09-28-2014, 01:10 AM
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Re: Do not get water in your tailpipe

I have no idea could be mis matched metal materials. Im in the trucking industry. Yes pipes get water in them both from weather conditions and washing but im 100% positive this very small amount does not cause failures to catalysts.
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Old 09-28-2014, 01:30 AM
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Re: Do not get water in your tailpipe

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Originally Posted by nicjak View Post
I have no idea could be mis matched metal materials. Im in the trucking industry. Yes pipes get water in them both from weather conditions and washing but im 100% positive this very small amount does not cause failures to catalysts.
Fair enough...I can see where big trucks are a different beast with hopefully bigger, better cats. My concern with the diesel GC is the slant of the exhaust allowing draining back to the lowest point, the cat, which is only a few feet from the tips. I've sprayed the undercarriage and heard the cat sizzle when water hits it. No telling what happens when that happens internally. According to cat manufacturers, thermal shock is a cat killer. Even external contact with snow or deep water when hot can crack the ceramic insides.

Everyone can draw their own conclusions but the failure rate is high and I'd like to know why. My vehicle spent over 2 months in the shop before they determined the cat was bad. Others are experiencing the same issues.
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Old 09-28-2014, 01:45 AM
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Re: Do not get water in your tailpipe

So you saying dont drive on rainy wet roads same water hitting pipes
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