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Can the DEF system be removed?

Re: Can the DEF system be removed?

Postby 19trax95 » Jan 01 2021, 7:26pm

Once it is all disabled, it will need to be removed. The tank can stay, but the catalyst needs to go.
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Re: Can the DEF system be removed?

Postby ferraiolo1 » Jan 01 2021, 7:36pm

This is why the early 2000s diesels are so expensive. They are sought after, since they were the last trucks that were emissions legal without def


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Re: Can the DEF system be removed?

Postby Pipsfc [OP] » Jan 02 2021, 6:34pm

This whole situation is ridiculous. I should be able to remove my DEF system in environments that are subfreezing the majority of the year. This just tells me that the idiots who implemented the requirement are city rats that have no clue. Frustrating...

Not sure I'll take the chance to remove it just yet. When I get to AK I'll ask around a bit more. Maybe AK has an exception I'm missing.
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Re: Can the DEF system be removed?

Postby 19trax95 » Jan 02 2021, 6:39pm

There is zero exemption...

And you will not have an issue with it freezing. There are heaters in the tank to solve that issue. It freezes all the time here in PA too, but the ecm knows that, and will turn on the heaters to thaw out the tank before it commands the start of dosing for the def.

DEF has been around since 2010 and of all the issue these systems have, freezing is not one of them.
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Re: Can the DEF system be removed?

Postby Pipsfc [OP] » Jan 03 2021, 10:08pm

Well... that makes me feel a little better I guess...
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Re: Can the DEF system be removed?

Postby OilFracker » Jan 03 2021, 11:47pm

Yeah. And when you turn a DEF vehicle off a special pump sends all of the DEF fluid back into the DEF tank so the lines do not freeze and break. You can hear the pump buzzing for about ten seconds after you shut the engine off.

DEF freezes at around 12°F

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Re: Can the DEF system be removed?

Postby Farmguy » Jan 06 2021, 6:19pm

The computer knows if the def temperature, so know if it is frozen.
(and it has a whole bunch of programming that deals with frozen def status)

It will not fault when in those temperatures.

It uses a tiny amount of def per hour, so doesn't need to 'melt' much before it can use it.

1000's and 1000's of these trucks spend lots of time at temps below 12*F. Alaska isn't the only place these trucks are used at temps a lot below that level.
DEF has been in use on the 6'6L dmax since the fall of 2010, when the first 2011's shipped.


The blend ratio of urea and water in the DEF product was selected so freezing does not cause separation of the 2 parts.
(freezing and thawing doesn't damage the DEF)
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Re: Can the DEF system be removed?

Postby Pipsfc [OP] » Jan 09 2021, 8:27pm

Farmguy wrote:The computer knows if the def temperature, so know if it is frozen.
(and it has a whole bunch of programming that deals with frozen def status)

It will not fault when in those temperatures.

It uses a tiny amount of def per hour, so doesn't need to 'melt' much before it can use it.

1000's and 1000's of these trucks spend lots of time at temps below 12*F. Alaska isn't the only place these trucks are used at temps a lot below that level.
DEF has been in use on the 6'6L dmax since the fall of 2010, when the first 2011's shipped.


The blend ratio of urea and water in the DEF product was selected so freezing does not cause separation of the 2 parts.
(freezing and thawing doesn't damage the DEF)


This is good information. I feel a little better about it.
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