Do not get water in your tailpipe - Page 3 - Jeep Garage - Jeep Forum

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  #25  
Old 09-29-2014, 05:04 PM
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Re: Do not get water in your tailpipe

Quote:
Originally Posted by nicjak View Post
So you saying dont drive on rainy wet roads same water hitting pipes
Maybe is suggesting not to drive too fast in reverse in heavy rain?

Wonder how much water you'd really need to have in order to have the water survive as liquid long enough to get within any reasonable distance of the cat, unless the cat back system had been replaced with straight pipe where it could cool down fast enough to avoid flash steaming any small amounts of water long before it got far.
Unless someone washes their vehicle with a fire hose...

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  #26  
Old 09-29-2014, 05:26 PM
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Re: Do not get water in your tailpipe

I feel like someone just killed my cat...I give up!!! Until you guys go lay under your ride and take a look, it's all just fun and games. I do apreciate the humor....cracks my cat, really. They say you can lead a cat to water, but you can't make him...ugh...nevermind!

I hope Jeep solved the quality issue, if that's what it is, for my replacement cat. I won't be driving through 20" of water, frontwards or backwards (good point, thanks), either way. Nor will I power wash the underside or spray down the exhaust tips while it's piping hot from a regen.

Y'all do what you want. CAT KILLERS!
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  #27  
Old 09-29-2014, 06:06 PM
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Re: Do not get water in your tailpipe

Quote:
Originally Posted by ExcursionDiesel View Post
I feel like someone just killed my cat...I give up!!! Until you guys go lay under your ride and take a look, it's all just fun and games. I do apreciate the humor....cracks my cat, really. They say you can lead a cat to water, but you can't make him...ugh...nevermind!

I hope Jeep solved the quality issue, if that's what it is, for my replacement cat. I won't be driving through 20" of water, frontwards or backwards (good point, thanks), either way. Nor will I power wash the underside or spray down the exhaust tips while it's piping hot from a regen.

Y'all do what you want. CAT KILLERS!
You seem to be pretty passionate about your findings. While trying to convince non-believers on the internet, have you discussed it with anyone at Jeep? They may have some information that would indicate this is not a major problem, or they may decide they agree and publish a warning.

You started the OP with;

"This rash of failed Catalytic Converters ..."

I may have missed something, I often do , but I haven't seen a rash of complaints here on the forum. Are there many threads on the topic?



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  #28  
Old 09-29-2014, 07:49 PM
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Re: Do not get water in your tailpipe

My opinion.
From engine back, the exhaust gas travels thru the DOC, then the DPF, then the SCR. After the SCR it passes thru the mufflers (resonators, whatever) and out the tailpipes. As I recall on my Jeep there is a noticeable mixing section in-between the injection point of the DEF and the SCR catalyst itself. Seems like a pretty large amount of water would need to flow backwards past the mufflers to make it into the SCR housing. Not impossible, but probably really unlikely during normal operation.

As for thermal shock loading: The DOC/DPF and SCR catalyst housings surely must be (or should be) designed to get externally soaked with cold water or snow while it the vehicle is in regeneration mode and the skin temperature is super hot. I do know that the NOX sensors (which measure Nitrogen Oxide pre and post SCR to determine how much DEF flow is needed) do not tolerate any water or antifreeze. One of the quickest way to wipe out a NOX sensor is to expose it to water.
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