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#31
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'85 300td Frybrid WVO Kit |
#32
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I'd think the bright lights are dead plugs, and the dim one is working...
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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! |
#33
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Yes, the test light was in series with the GP. Anyone else have any thoughts?
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'85 300td Frybrid WVO Kit Last edited by bpeters2; 11-18-2011 at 04:29 PM. |
#34
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The brightness of your test lamp light would vary inversely with GP resistance. Dim lamp, high resistance, bad GP.
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#35
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It's the other way around. Think of it this way. A high resitance glow plug (bad one) in series with a light bulb will provide less current to the bulb thus it will be dimmer than a low resistance glow plug (good one), which will provide more current to the bulb making it brighter..
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#36
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I agree. A test light will tell you that a GP is bad if the light doesn't light, but a positive with a test light only indicates that a GP might be good. The best way is to measure current draw. I learned this when I had a Ford with a 7.3 IDI engine. The GP system had to be perfect for cold weather starts. I did find plugs that would light a test light but would barely glow when tested outside the engine. I also learned (the hard way) to use OEM plugs from Ford. I believe they were made by Beru.
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#37
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Thanks for the Info. I'll replace the one gp that produced the dim light and see how she starts on a cold morning and then go from there.
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'85 300td Frybrid WVO Kit |
#38
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Answer
Quote:
Glow plugs link thread - PeachParts Mercedes ShopForum .
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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/ |
#39
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in series, of course lower resistance shows brighter. dim or not lit at all, bad. gotcha. same as measuring ohms resistance. I like pulling them and watching them glow. or simple ohm test. basically, if the car has trouble starting... all the glow plugs come out, and new ones go in.
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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! |
#40
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I've done the ohms check and had them fail.I use
jumper cables to check them.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#41
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#42
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#43
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Just remember its a long time till the warm weather of next summer !!!
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#44
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Glow plugs appear to be similar to bearings. The bell curve from the one's that go first to the one's that go last seems to span a factor of five or more. I keep track of the individual failures. I've changed 1,2,3, and 5 on the SD over the course of eight years. #4 is still operating fine. The reason for the wide variation in durability is clearly the result of an additional unknown variable, or manufacturing tolerances. I'd never replace "all of them on principle" unless we're talking about the 603 and the manifold is off. That makes for a different conclusion. |
#45
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Quote:
In summer time 1 minute each.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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