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  #1  
Old 03-27-2006, 05:35 PM
Tradonguy
 
Join Date: May 2003
Location: Prince George, BC, Canada
Posts: 68
'81 300SD Glow Plug Relay

Hello. My glowplug relay on my '81 300SD is not working all the time so I want to replace it. I understand there is one that keeps the glowplugs on for a couple of minutes after the engine is running. Does anyone have one of these or know where I can get one? I saw a Bosch #7001591953 on Ebay but it came with glowplugs too. Since I just replaced my glowplugs, I only need the relay. Thanks for your help.
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  #2  
Old 03-27-2006, 05:44 PM
Cabernet red, actually
 
Join Date: Jan 2006
Location: Willamette Valley, OR
Posts: 503
You are talking about one of the Bosch Duraterm relays.

I have the part # for this at my house, so if no one posts it before tonight I will post it. I'm pretty sure the part you saw on e-bay is not the same number I had, though.

If you don't want to wait you could probably find the part # by googling 'duraterm' or searching for it on this site.

Edit: Also, only certain plugs will stay on longer with the new relay. If the plugs you put in are new and are Bosches there's a good chance they're the right ones. I believe they sell these on Fastlane if you want to check the part #. When I searched for plugs on Fastlane for my '85 300D, the Duraterm style plugs came up.
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1985 300D Turbo, CA model
248,650 miles and counting...
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  #3  
Old 03-27-2006, 06:11 PM
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Join Date: Dec 2005
Location: Los Angeles, CA
Posts: 340
Cool Relays

I bought the kit @ http://www.***************/search/productx.aspx?sid=uosdx0aa2b00vfz3cxuen345&partnumber=0250201955
it comes with new pencil G/Ps as opposed to the filiment type, the kit is for a 240D 4 Cyl so for the 5 cyl you will need a extra plug and a extra smaller relay.
Does the 81 have pencil type G/Ps or filiment?. I just re-read your post you are looking for the relay only.
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1979 300D.

Last edited by hawthorne90250; 03-27-2006 at 06:17 PM.
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  #4  
Old 03-27-2006, 06:49 PM
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Join Date: Dec 2005
Location: Los Angeles, CA
Posts: 340
Cool G/Ps

Quote:
Originally Posted by voice
did you check the fuse before buying that?
Who Mine were working as well as can be expected prior to the upgrade.
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1979 300D.
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  #5  
Old 03-27-2006, 06:54 PM
Craig
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I have the upgraded relay installed in my 82 300D, it does seem to help with cold running and reduce the smoke when it's cold. I also suspect it causes the glow plugs to burn out sooner due to the extended use, but I've been happy with mine for several years. I would just buy the kit with the 4 GPs and keep them as spares, sooner or later you will need them anyway.
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  #6  
Old 03-27-2006, 06:58 PM
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Join Date: Dec 2005
Location: Los Angeles, CA
Posts: 340
Quote:
Originally Posted by Craig
I have the upgraded relay installed in my 82 300D, it does seem to help with cold running and reduce the smoke when it's cold. I also suspect it causes the glow plugs to burn out sooner due to the extended use, but I've been happy with mine for several years. I would just buy the kit with the 4 GPs and keep them as spares, sooner or later you will need them anyway.
Be careful, the G/Ps that come with the kit are to replace the old type filiment G/Ps and are 18mm, i think later cars the G/Ps are 14mm thread.
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Old 03-27-2006, 07:07 PM
Craig
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Quote:
Originally Posted by hawthorne90250
Be careful, the G/Ps that come with the kit are to replace the old type filiment G/Ps and are 18mm, i think later cars the G/Ps are 14mm thread.
He's talking about a different kit to upgrade the stock relay to the "post-glow" type:

http://cgi.ebay.com/ebaymotors/Mercedes-glow-plug-relay-W116-W126-W123-300D-240D-300SD_W0QQitemZ8051363305QQcategoryZ33693QQrdZ1QQcmdZViewItem

The kit you are referring to is to update from the old filiment G/Ps to the pencil type, his 81 does not have the old filiment G/Ps.
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  #8  
Old 03-27-2006, 07:11 PM
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Location: Los Angeles, CA
Posts: 340
G/Ps

My Bad
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  #9  
Old 03-28-2006, 01:13 AM
Cabernet red, actually
 
Join Date: Jan 2006
Location: Willamette Valley, OR
Posts: 503
The relay # is 0 281 003 096.

The plugs that go with it are 0 250 201 039 -711.

I've discovered the plugs work just fine with the old relays, too.
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1985 300D Turbo, CA model
248,650 miles and counting...
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  #10  
Old 03-28-2006, 04:59 AM
Diesel Giant's Avatar
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Join Date: Oct 2004
Location: Loganville/Atlanta
Posts: 2,156
You can use the large style pencil plugs in place of the loop style and you DONT have to replace the relay. I did the conversion on my '79 and it runs great.
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