300 Tdi decanter weak drain plug - Defender Source
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  #1  
Old July 18th, 2011, 12:55 PM
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Julien Dalbin
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300 Tdi decanter weak drain plug

I've been thinking of a substitute for that very weak part and
I've this in mind:

http://www.mcmaster.com/#thumb-screw-fasteners/=d8cbww

You can cut the slot with a dremel cutting wheel

The original part number is 37H7920:

http://www.lrseries.com/shop/product...-PLUG-KIT.html

Thoughts ?
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  #2  
Old July 18th, 2011, 11:14 PM
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Is the threading the same?
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  #3  
Old July 18th, 2011, 11:31 PM
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Carl Jonsson
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By Decanter do you mean Sedimenter? The drain plug on the sedimenter is useless.
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  #4  
Old July 19th, 2011, 06:05 AM
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Gren Thomas
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Hi Julian,
I've been trying to do the same thing, as the drain tap is vunerable on my setup.
I intend to replace it with a brass hex head bolt however i have not been able to find the correct thread pitch.
a 5/16" is the closest i got but the replacement bolt only goes in 2 turns before it becomes thread bound.

let me know if you find the correct thread pitch.

have fun

Gren
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  #5  
Old July 19th, 2011, 07:38 AM
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Quote:
Originally Posted by Gren_T View Post
Hi Julian,
I've been trying to do the same thing, as the drain tap is vunerable on my setup.
I intend to replace it with a brass hex head bolt however i have not been able to find the correct thread pitch.
a 5/16" is the closest i got but the replacement bolt only goes in 2 turns before it becomes thread bound.

let me know if you find the correct thread pitch.

have fun

Gren
One way to solve the problem would be to use the plastic plug as a model and use the lost wax casting method to create a plug in the metal of choice.
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Old July 19th, 2011, 12:08 PM
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Quote:
Originally Posted by Dennis View Post
Is the threading the same?
As far as I know it's 5/16 - 18 but I may be wrong.

------ Follow up post added July 19th, 2011 12:08 PM ------

Quote:
Originally Posted by Manimal View Post
By Decanter do you mean Sedimenter? The drain plug on the sedimenter is useless.
yes and yes.

------ Follow up post added July 19th, 2011 12:09 PM ------

Quote:
Originally Posted by Gren_T View Post
let me know if you find the correct thread pitch.
I will.

------ Follow up post added July 19th, 2011 12:10 PM ------

Quote:
Originally Posted by John_Karlsson View Post
One way to solve the problem would be to use the plastic plug as a model and use the lost wax casting method to create a plug in the metal of choice.
Sounds good. What metal you have in mind ?
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  #7  
Old July 19th, 2011, 12:18 PM
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Carl Jonsson
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I've never removed mine. It's stuck and I would probably break it trying to remove it. I just took apart the sedimenter and cleaned out the inside. Glad I did because there was a lot of crud that was stuck inside that would never had made it out the drain hole.
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  #8  
Old July 19th, 2011, 12:45 PM
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Quote:
Originally Posted by JFD View Post
As far as I know it's 5/16 - 18 but I may be wrong.



Sounds good. What metal you have in mind ?


You just had to ask, didn't you! I haven't done any casting since the '70s, but my preferred metals then were gold and silver. For this purpose, I think brass would work, although there might be some corrosion issues with the brass next to the metal housing.
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  #9  
Old July 19th, 2011, 02:27 PM
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Julien Dalbin
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Quote:
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I've never removed mine. It's stuck and I would probably break it trying to remove it.
Order a couple and keep one in cubby box.

------ Follow up post added July 19th, 2011 02:28 PM ------

Quote:
Originally Posted by John_Karlsson View Post
You just had to ask, didn't you! I haven't done any casting since the '70s, but my preferred metals then were gold and silver. For this purpose, I think brass would work, although there might be some corrosion issues with the brass next to the metal housing.
I was thinking aluminium. I'll check with my machinist how tedious
it would be to mill one.
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  #10  
Old July 19th, 2011, 02:29 PM
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Quote:
Originally Posted by John_Karlsson View Post
You just had to ask, didn't you! I haven't done any casting since the '70s, but my preferred metals then were gold and silver. For this purpose, I think brass would work, although there might be some corrosion issues with the brass next to the metal housing.

Hey, gold may be soft, but it doesn't oxidize easily!
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  #11  
Old July 19th, 2011, 06:56 PM
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Quote:
Originally Posted by JFD View Post
Order a couple and keep one in cubby box.
I chose a slightly different solution. I thought that the plug would break, leaving some unpleasant portion stuck in the housing and creating a messy under-the-truck repair. So now I have a brand new sedimenter, complete with new plug. If/when I break the old plug, I just need to swap the new for the old.

Gold may be soft, but it's harder than the plastic they used for the plug. I have a wonderful book on gold alloys....
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  #12  
Old July 20th, 2011, 11:43 AM
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If you decide to use gold, at it's current price, that plug could end up doubling the value of the entire truck !!
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