'81 300SD Glow Plug Relay - PeachParts Mercedes-Benz Forum

tradonguy · #1 03-27-2006, 05:35 PM

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.

Maroon 300D · #2 03-27-2006, 05:44 PM

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.

hawthorne90250 · #3 03-27-2006, 06:11 PM

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.

hawthorne90250 · #4 03-27-2006, 06:49 PM

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.

#5 03-27-2006, 06:54 PM

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.

hawthorne90250 · #6 03-27-2006, 06:58 PM

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.

#7 03-27-2006, 07:07 PM

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.

hawthorne90250 · #8 03-27-2006, 07:11 PM

My Bad

Maroon 300D · #9 03-28-2006, 01:13 AM

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.

Diesel Giant · #10 03-28-2006, 04:59 AM

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.