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#1
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Glow plug bypass - tell me why this won't work
On the old torn up 300D I think I have some glow plug relay issues or other possible electric gremlins. The previous owners have not been gentle with this car and the wiring harnesses are cut in several places. Car runs rough, mostly I think due to no glow function. But, I'm not really complaining it was only $400.
What I want to do is go with the pencil plugs on the '78 300D and basically hook up a switched line direct from positive on battery to glow plugs. I'll re-wire them to run parallel rather than series and let them ground out on the block. If I wire it such and turn the switch for 10-20 seconds or so I should get glow in the cylinders. Right? So tell me, why won't this or why it's a really bad idea?
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-livin' in the terminally flippant zone |
#2
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well say it does work, what about after the car is started? ur just gonna let the GPs keep running?
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1983 Euro 240D 277K 2016 Mazda 6 Coming Soon, 2013 Mercedes E350 Bluetec Formers: 2012- Mazda 3 2007 Outlander- complete pile 1995 E300 Diesel 208K 2007 VW Passat 2.0T 63K SOLD 2003 Jaguar X-type 3.0 Sport Sold 04/11 w/88K 2009 Lexus RX350 9061 miles. Sold 04/09 2008 Mitsubishi Lancer GTS:Totaled Sept.,09 @ 24,000 2003 Infiniti I35 58K Sold 1984 300 turbo diesel 222K |
#3
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nope, once started I'll turn the switch off. Essentially I become the timer relay without the accompanying flow of electricity (I hope).
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-livin' in the terminally flippant zone |
#5
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Sure it will work. I would use a older style ford starter solenoid and a pushbutton myself. The starter solenoid can easily handle the 80 amps and the push button you will never leave on accidentally.
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#6
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Instead of all that why dont you just do this
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 |
#7
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peragro,
Using a started relay and switch will work . Make sure U use a momentary switch or push button so U don't forget to turn the GP off. After a while U will be able to estimate how long to leave the GP energized for easy starting depending on the temperature. I essentially do the same thing on my automatic system because the GP light doesn't stay on long enough for easy starting. |
#8
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Quote:
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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" |
#9
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Quote:
Glow plugs in parallel should handle the 12V directly, especially the pencil type ones, and I'm still keeping the 80A strip fuse in the circuit just because. That's a really nice write up though, and I've been looking at your site. I'm sure if I can find an old 300TD that I'll be looking into some of the kits that you have...
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-livin' in the terminally flippant zone |
#10
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does anyone know what to ask for at the parts store with regard to the solenoid? I tried autozone and asked for a ford starter solenoid and they just gave me a blank stare. If you guys could tell me where to look on an old ford I could just head to the junkyard.
I'm assuming that any pushbutton switch would do?
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-livin' in the terminally flippant zone |
#11
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Pretty sad to walk into a parts supply place and not be able to get a Ford solenoid, maybe you should ask for the manager. The push button switches should be available there too, I used a 15 amp one.
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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" |
#12
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If you go back to autozone tell them 1987 ford f-150 2wd auto 351cid V8. starter solenoid
without all that info those jackasses wont be able to find parts for their own cars. I wonder how many autozoners ride bikes to work? |
#13
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The junkyard up the road has complete, or near complete, GP harnesses and its ancillary items. There has got to be a yard in your area with the same; and for way less money.
(although rumor has it that MB diesels come to Fla to retire, so I could be wrong)
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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D |
#14
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I ended up popping back in to Autozone later in the evening on the way to rent some movies. I found a different guy and told him that I wanted the cheapest starter solenoid that was switch activated that he had and then told him what I wanted to do with it. He seemed to know what he was doing and went right to the part, so I'm all set with parts.
The town where I live is pretty small and very remote. I've already picked through the 3 old Benzes that we have in the local boneyard. All had the more modern GP relay. There is a yard about 120 miles south that has half-price weekends for you to pick and pull. My buddy and I are seriously contemplating a ride down there next weekend (which is the half-price weekend). Reportedly they have and old 300D still. I'm just not real excited about spending the day in the junkyard when it's 110F. I'll just wear a big floppy hat and about a gallon of sunscreen...
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-livin' in the terminally flippant zone |
#15
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Try this source for several different kits !
At:
http://www.**************.com/ you can put " glow relay manual " in the Search Box and you will see the several kits they have to do what you want... although a bit pricey! But hey, they include a good set of instructions too if that means anything to you. You should have done away with that old series system as soon as you got the car! The normal amps for the new system is 50 to 60 amps and the fuse is 80 amps. I think the old one was only a 50 amp fuse which mean the glow plugs were drawing ~40A and much of that was used to heat up those large series wires on the outside of the engine. Very inefficient!!! Sam |
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