Help Glow Plugs for '75 300D - Page 2 - Mercedes-Benz Forum

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post #11 of 19 (permalink) Old 08-07-2013, 07:43 AM
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Loop-style plugs don't break during transport. Before putting them into the engine, you can test them for resistance: infinite resistance between entry an exit means a faulty plug. Usually the loop is broken as well if there is infinite resistance. Loop-style plugs are very rare nowadays, so if somebody tests them by measuring resistance between connection and threads, that is not going to work, that is not how to test them.

if they don't have infinite resistance, put them in the engine and test the entire system according to the FSM:
15 Electrical System Engine (Preglow) - OM617
there 15-510, section D

The best test is if the engine starts.

The relay can be faulty too.
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post #12 of 19 (permalink) Old 08-07-2013, 08:56 AM
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When You drive these Old Cars an Auto Club Membership or Insurance that has some free Towing and Lock Smithing services is actually a Money Saver in the long run.

If You had the free towing You could have it towed to another Mechanics Shop.

Or if there is parking on the Street You could get a friend and simply Push the Car off the Shops lot and park it on the Street.
My Father and I did that when I was Kid and He had a problem at a Transmission Shop.

As far as the Engine end of the issue goes you need the parts Pictured and the little Nuts for the Glow Plugs.
The 10 Gauge Wires and the Eyes that go in the end can be had at any Auto Parts store and you make Your own wires.
There is a Wire on the Stock Glow Plug System that goes from the Front Glow Plug to the Cylinder Head. With the Adapter Glow Plugs you do not use that Wire; remove it so there is no temptation to connect it.

It is pretty much remove all of the stuff needed to make the Stock Glow Plugs work off of the Engine.
Screw in the Adapter Plugs.
Use the Wires shown in the Pick from one plug to the other and on the Plug near the Fire Wall connect the Wire from the Knob to the Glow Plug.

Again the Adapter Plugs do not need that Ground Wire at the front. The Adapter Plugs are grounded through the Threads just like a Spark Plug is.

I don't know if there is any issues with the Gorilla Knob thing You pull to activate the Glow Plugs.
There is likely info on that at the below site:
Repair Links
DIY Links by Parts Category - PeachParts Mercedes ShopForum
PeachPartsWiki: Do It Yourself Articles - Mercedes Vehicles
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post #13 of 19 (permalink) Old 08-09-2013, 10:40 AM Thread Starter
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We have gone through 15 plugs and none of them have worked. He is testing them by grounding each one and running a current through it just for a few seconds and none of them get hot
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post #14 of 19 (permalink) Old 08-09-2013, 10:54 AM
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Hold up, how is he running current through them? If its off the battery he could be burning them out. Also, these glow plugs are not grounded through the block like the pencil style are. They are wired in series (from one glow plug to the next) and then grounded from the last plug to the engine block via a grounding strap. I he's just putting power to the plug and grounding the plug body not even good ones will work.

1997 E290 Turbo Diesel Wagon
1992 BMW 525i -Traded in
1990 Silver 300TE -Sold Loved the wagon, hated the m103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold
1979 Silver 300D "The Silver Bullet" -Sold and sorely missed
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post #15 of 19 (permalink) Old 08-09-2013, 11:15 AM Thread Starter
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He is saying that the plugs are grounded when they are screwed in.. This mechanic has a lot of experience with old mercedes and he's convinced the Bosch plugs are defective
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post #16 of 19 (permalink) Old 08-09-2013, 11:22 AM
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Quote:
Originally Posted by Johnny300 View Post
He is saying that the plugs are grounded when they are screwed in.. This mechanic has a lot of experience with old mercedes and he's convinced the Bosch plugs are defective
He is mistaken. Let him read the FSM.

And 15 defective glowplugs doesn't seem implausible to him?


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post #17 of 19 (permalink) Old 08-09-2013, 02:16 PM
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He is mistaken.
X2!!!!

Loops style plugs are 100% absolutely not grounded by being screwed into the block. Him saying that he thinks that all 15 glow plugs in a row were bad make me question his willingness to troubleshoot a problem or research and learn. I would personally take my car somewhere else or show him this thread and see what he says. If he admits his mistake he may be worth using in the future, if not look elsewhere.

1997 E290 Turbo Diesel Wagon
1992 BMW 525i -Traded in
1990 Silver 300TE -Sold Loved the wagon, hated the m103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold
1979 Silver 300D "The Silver Bullet" -Sold and sorely missed
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post #18 of 19 (permalink) Old 08-09-2013, 03:07 PM
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For the love of the Benz gods...find a new mechanic...

By chance is there any members close to him, that can install the plugs and get the car far far far away from that garage?
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post #19 of 19 (permalink) Old 08-09-2013, 04:39 PM Thread Starter
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Thanks a lot y'all! He swallowed his pride and admitted he was wrong! I really appreciate all your replies! If anyone knows a good diesel mechanic around Cleveland I would really appreciate it!
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