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#1
11-27-2006, 11:32 PM
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Series glow plugs and Testing
I have a couple questions concerning glow plugs that I had a hard time locating concrete answers on. Car in question is my '79 240D. I have the old (original?) series glow plugs. My car normally starts fine, only a couple seconds of cranking. We've had a few kind of cold mornings here, high 20's F. It still starts OK but is a little grumpier about it. I glow cycle it twice, seems to help a little. I have noticed though that I have to give it some pedal to keep it going though, for about 20-30 secs when cold. It seems to be missing on one cylinder, but then it smoothes out and runs nicely. Don't have to throttle it to keep it idling. This sounds like a dead GP symptom, but I have series plugs, so here's my questions.
1. How do I test these SERIES, not paralell GP's? 2. Can one GP die and the rest be OK in a series setup? I wouldn't think so (electrically I know this would shut off all plugs). The glow plug light seems to be fine. Glows for ~30-45 secs and then shuts off. The dome light does dim, so they are drawing power. I want to know what this might be due to, I don't want to have a bad starting car come this winter when it gets cold.
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'79 240D 4 speed manual 105k miles 
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#2
11-27-2006, 11:44 PM
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One bad all bad in the series system. Best to convert to pencil type. Simple job. Remove series plugs and wires. Install pencil plugs. Put in new jumper wires and hook up the first plug to the hot wire. Presto, better starting.
When were your valves last adjusted?
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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
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#3
11-27-2006, 11:58 PM
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I didn't see how one plug could be dead and the others still working. Is it possible to have a weak plug, and not a dead one? I may convert to the pencil plugs, may be a Christmas break project. Same with valve adjustment, going to do in a few weeks in the garage at home. It has heat. I don't know when the valves were last adjusted, I haven't done it since purchasing the car 3000 miles ago and 3 months ago. Oil consumption is moderate and blowby is also moderate, so I am sure I have less than optimal compression also.
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'79 240D 4 speed manual 105k miles
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#4
11-28-2006, 01:07 AM
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If you re-read Kerrys post he says that if one is bad then none will work on the series type. I have the same ones in my '77 240 and I am getting hard starts too. It is accecptable to give light throttle to start cold.
I just hate waiting so long to glow. Try checking ALL of the connections on each glow plug AND the fuse strip. Getting each connection clean and tight can make a difference.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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#6
11-28-2006, 05:37 AM
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I am getting ready to do this upgrade on my '79 which also has the series plugs. I HATE them!
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 
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