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Updating glow plug system
A friend has already installed the new style plugs in his '79 300CD. Can we get a glow plug wiring harness out of a newer 123 or even 126 chasis and use it to run the GPs? How would we connect that harness to the older style one in the CD?
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#2
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If you are using "fast" pencil style plugs in that older engine that had used "series" style? then yes. you need a diagram of both systems to see where to graft-in the new signal wires.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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Did you get the new GP relay (kit) If not all you need too do is disconnect the ground, use a 80 amp strip fuse instead of the 50 amp and your good too go. Just glow for 5 to 10 seconds.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#4
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When I put the pencil style plugs in the 77 300d, I just disconnected the ground, hooked the first one to the same wire the first series plug was connected to and put jumper wires between the plugs. Been working fine this way for years.
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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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Yes that is correct.
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#6
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Quote:
I think he did get the relay, except that he ordered the wrong one and it was for the 4 cyl; not the 5, so he can't use it. I am "assuming" that if we can locate a hot wire that the relay will take care of all switching/timing issues. Failing this, has anyone installed a manual " push top start" momentary contact switch to run the glow plugs? I would use a relay to ahndle the heavy current; the switch would only carry a very light current. ( I have done this on my F250 Diesel--their GP controller was a menace. Ford installed 6 volt plugs in a 12V system to get faster starting. The controller was supposed to cycle the plugs to keep them from frying on 12V. They would only tolerate about 15 seconds before burning out. I saw my controller comeone while driving down the road at 50mph with a warm engine. They were burnt out before I could even stop. I switch to 12V GP and a manual push button, and haven't had any problems in 6 years or so. But this is a Ford--do Mercedes folk tolerate such re-engineering of these machines?
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
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Quote:
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#8
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Which plugs do you need? The Bosch part number 80006 pencil type can be had at AutoZone for 9.99 each.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#9
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80006 are the small body plugs, I need the large body plugs... for the 79 motor that this thread is talking about... the upgrades from the series set.
John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#11
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Do you or anyone else who has made this modification have a part number?
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#12
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Quote:
__________________
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 |
#13
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loop -> pencil, 1980 300D
Hi--Thanks for all of the great sharing of information!
One day a couple of weeks ago on my 1980 300D, I had a flashing gp light on the dash and no start--not even crankable. I took the opportunity to get the pencil style (large body) plugs, but wonder if it's actually the relay. Before I test the new glow plugs, I'd like to make sure I'm clear on a few points: 1. Disconnect the ground strap (at front of engine) from glow plug post 2. Use some heavy insulated wire to make jumpers between plugs (to replace the stiff wires) 3. Replace 50 amp fuse with 80 amp fuse? (necessary?) And then I guess I'll see if my problem was the plugs or something with the relay; I'm thinking it might be the relay since I didn't get a crank. If that's the case, I'd be interested in a "manual" glow period with a switch on the dash, like Stevo--and so a 15 amp switch will be adequate? Thanks! |
#14
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Quote:
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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 |
#15
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Quote:
__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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