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#1
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Loop to Pencil Glow Plug Conversion
I've just ordered a conversion kit for my 76 300D (115). Does anyone know if the Bosch kit comes with instructions? If not, is it possible to wire these plugs into the existing circuit such that the glow plug light and ignition swith will function as before? I had to order an extra plug with the kit for all 5 cylinders, will I have to get any other parts for the kit to work on my 5 cylinder?
I've searched the forumn but can't find any specific instructions on this conversion. TIA for the help, David |
#2
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I did the switch on a 78 240D. The kit inlcuded decent instructions, but will not directly plug into any harness. You'll have to do a little custom wiring. I did a write-up on it at http://home.comcast.net/~phantoms/vacuum/index.htm. Unfortunately, all the large pictures were lost on a server change over and I didn't have them backed up.
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85 300CD 83 300TD 78 240D (daughter) |
#3
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Glow Plugs
I cannot speak for a W115, but i did the conversion on my 79 W123. There are two ways to do it, 1) convert you series setup (79 W123) to a Series/Parallel set up, this is done by removing the old glow plugs/wires and Grounding strap and installing the new plugs with new fabricated jumpers wires to each plug( Leave the Grounding strap off the last plug off,Cyl #1). This method will improve your starting immeasurably. I drove around for months like this and it worked fine, The problem with this is the plugs go off when the engine starts.
With the new relay kit the plugs stay on for 3 minutes after engine starts and this smooths out the idle untill the car heats up, works great. Because you car has five cyls you have to order the extra plug and you will need a extra relay to work # 5 cyl i think the part # is 0 332 002 156. Yes, the kit comes with instructions. I hope this helps but remember mine is a 79 W123.
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1979 300D. Last edited by whunter; 07-16-2010 at 08:11 PM. Reason: removed bad link |
#4
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I ordered the additional relay and an extra glow plug. Is the addtional relay used in conjunction with the relay in the kit or does it replace the one in the kit? I received the kit today and the instructions don't mention how to wire it for a 5 cylinder.
Thanks for all your help |
#5
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Relay
If you have a 5 Cyl, then its its for the extra cyl, are you sure there are no extra instructions for the 5th cyl???
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1979 300D. |
#6
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Nope, no 5 cylinder instructions in the fast glow kit. Just 1 sheet with instructions in 8 languages.
The extra relay will arrive in a few days maybe it will have some instructions. Thanks again, |
#7
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Gp
Quote:
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1979 300D. |
#8
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Thanks, you have a new PM
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#9
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On my 77 I just replaced the plugs, removed the ground strap, installed the jumper wires between each plug and hooked plug #1 up to the existing relay system. I did this about 3 yrs ago and have had no problems at all. I don't see any real need to keep the plugs on after the engine starts since I don't have any post-start idle problems. Made a HUGE difference in cold starts (below 10 degrees fahrenheit)
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#10
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Quote:
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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue). |
#11
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Sorry, as stated all the large images were lost on a server change. In fact, the whole page was lost and the only way it's there now is by the gracious help of users here who had archived it. The next time I'm around my daughter's car, I'll try to get some new pictures.
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85 300CD 83 300TD 78 240D (daughter) |
#12
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Your going through a lot of trouble for nothing. You dont need to replace the ralay.
http://dieselgiant.com/mercedesdieselloopglowplugrepair.htm
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1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair |
#13
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Got Glow, Now Wont Start
Well, I hooked the plugs up to the existing relay, they glow fine but I still cant get the thing started. A little history:
My daughter drove this car all last year before leaving for college in August. It sat in our driveway for a couple months before I started it and took it out for an hour or so and filled up the tank with fuel. Car sat some more until December when my daughter came home for Christmas. I tried to start it for her but couldn't, I wrote it off to cold weather. Let is sit for a couple more months and tried to start again, found an open (old loop style) glow plug. Converted to pencil style but still no start. I've taken out a glow plug and grounded it and turned the key to the glow position and the plug gets red hot instantly so I'm sure I got good glow plugs. What's an easy way to check if it's getting fuel? It seems just on the verge of catching sometimes but won't kick over. Is it possible the fuel's bad? How would I tell? This car ran great all last year for my daughter, I'm at a loss as to why it won't start now. TIA, David |
#14
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Running Finally!!!
Well after pumping the priming pump for what seemed like an eternity until I finally heard the buzzing noise and then pumping another full eternity, then cranking for about 30 seconds straight it finally caught and seems to run great. I'm letting it cool down now and see how another cold start goes.
I've never adjusted the valves on this so I think that's my next project and maybe a flush with the stuff at Diesel Giant. I also need to replace my injector return hoses, as they're all weeping. Could that have been the cause of the air in the system (or whatever required so much priming)? Final question: This is a W115 with an OM617 and I can't find any fuel pre-filter (the main filter is in a canister not a spin on), can I just add a pre-filter to this setup? Was there originally supposed to be a pre-filter? Thanks again for everyone's help. |
#15
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Yes, there is supposed to be a pre-filter. You can just splice in one of the L shaped prefilters from the later models.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE |
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