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#31
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However, this is the Bosch Glow Plugs made in Germany or France. It is possible that the are also made somewhere else now. If you removed the Fuel Injection Hard Lines you may need to bleed the Air out of them by leaving the Hard Line Nuts Loose at the Injector and cranking until Fuel comes out. Afterwhich tighten them and attempt to start.
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84 300D, 82 Volvo 244Gl Diesel |
#32
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Answer
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#33
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Recycled
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#34
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I am changing the glows in the 85 300SD today. I got them all out with just the normal amount of grunting and cussing and they all look brand new.
So I decided to test them with the jumper cable and battery and they all look to be working just like new. Now I am wondering if I have a bad wire on one of them. I guess I will put the new ones in and hope for the best. Any suggestions from the collective wisdom?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#35
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#36
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The wires can be tested from the larger of the plugs in your gp relay. Pop it off and there are the termination points for each gp clearly marked on the connector.
To ground, each of them should read less than one ohm. Best scale to read them on is your lowest one.
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
#37
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Well, thanks Jay.
I have them all in and wired now. I am pretty warm now so I'll go out and reinstall the hard lines and see if it fires without too much stumbling.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#38
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that's a fast way to test them. BUT I must still emphasizes that you look at the glow plugs as a resistor....if you test them through the wiring harness...all that wire adds resistance....you have to remove them from the circuit to get a proper reading....
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#39
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I got it all back together now but have not been able to get the air out of the lines and now the battery is down so I am waiting for it to charge for another go later. Unfortunately now its dark but should be able to getrdone by flashlight.
Thanks for all the help. I don't have an ohmmeter though so perhaps I should break down and buy one.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#40
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A new glow plug reads 0.7 OHM.
I just bought 5 new Bosch. I have a pretty accurate Fluke. Just out of curiosity I measured the new and the old. 4 new were .8 and one was 1.2
The old ones were .4, .8, .6, .8, .2 So can we assume that the .2 one was the bad one or does resistance rise as the fail, unless the element does burn out like a light bulb resulting in zero resistance? I just replaced ALL of mine beause I forgot about testing with a battery, although now I see that just glowing isn't all it needs to do, it needs to glow in the proper way as well.
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85 300TD FED-Daily 84 300SD-Wife's 86 XJS-Sunday 66 GMC-Work- Given to my stepson 83 BMW Airhead- Given to my stepson |
#41
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Actually the resistance of the copper wire is very close to zero. 3' of 10 gauge wire is .003Ω I doubt if most regular digital VOM's will read finer than .1Ω.
If you are pretty sure you have one out. Just pulling the connector at the harness will get you pretty close. The box on my new Bosch plug had a pretty good representation of what is going on in the the pencil glow plug. There is a small coil of wire that travels down to the end of the probe. I can imagine it shorting on the inside of the pencil .
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel. |
#42
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Well, after a couple of hours charging the battery it started right up with some wd40 to prime it.
I'd still like to test the old glows though so I guess I will buy an ohmmeter.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#43
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The GP resistance is very high/open circuit when it fails. Not zero. GP in general measures at very low resistance, < 2 ohm, are good. I reckon all the old one your replaced are good. When GP glows, the resistance will kind of reaching a steady state and draws about 10 to 12A. Most GP are rated at 120-150W ( battery voltage x current drawn, 12v x 12A = 144W ).
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#44
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Tom, you can get a good meter at harbor freight for less than $20
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#45
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We don't have one here. How about Autozoo?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
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