Strip fuse constantly blowing out - Mercedes-Benz Forum

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post #1 of 23 (permalink) Old 03-16-2017, 03:01 PM Thread Starter
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Strip fuse constantly blowing out

I could really use some help or advice. Thanks in advance
I am new to classic mercedesm ive had my 79 300sd since November and i love it to pieces. It has ran great and has been the best car ever, just hit 369k. Anyways, recently the strip fuse blow out and it just cranks and cranks. I figure i need to replace the glow plugs. I got my bosch oems in yesterday, im worried about removing the hard fuel lines and im worried that changing the glow plugs might not solve my problem. Could anyone help me out in tips for removing the hard fuel lines? Also, i got the first plug out but the wire attaching it kept spinning and spinning till it pulled a pin like piece and i was able to remove the plug separately. Will i need a new pin piece or is that a oart of the glow plug that i need not worry about? Thanks guys. I have already learned alot from this forum id just like some direct advise. Feel free to email me if i dont respond here. Juliansodope92@gmail.com
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post #2 of 23 (permalink) Old 03-17-2017, 03:34 PM
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Use a 17mm flare wrench, a 17mm flare crowfoot socket, or the special MB tool (000 589 68 03) to crack the hard line fittings.




The glowplug harness wire terminates in a ring connector that attaches to the threaded electrode with an 8mm nut.
It sounds like you sheared the electrode of the glowplug.
Can you attach a photo?
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post #3 of 23 (permalink) Old 03-17-2017, 08:43 PM Thread Starter
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Thank you for the advice! Ill post a picture first thing in the morning. Its its a pin that just pulled right out
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post #4 of 23 (permalink) Old 03-17-2017, 08:45 PM Thread Starter
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Will i need to purge the air from the fuel lines before it will start?
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post #5 of 23 (permalink) Old 03-18-2017, 12:04 AM
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Yes, you need to purge the air from the injector hard lines.

To get fuel to the injectors when you have lost prime:

1) Disconnect the hard lines at the injectors (17 mm flare wrench), and loosen the nuts on the hard line brackets (8 mm wrenches).
2) Unplug the glow plug harness (to save battery charge).
3) Use the primer pump to purge the air from the clear plastic hard lines. (About 50 strokes)
4) Crank 30-45 seconds, wait 10 minutes to let the starter cool off, repeat until fuel dribbles out of the rearmost metal hard line.
Be patient, and take your time...you don't want to fry your starter. (I watched some Netflix shows between the cranking sessions.)
5) Tighten the hard line fitting (17 mm) on the rearmost injector.
6) repeat step 4) and step 5) until each of the remaining injector hard lines dribbles fuel and are reconnected. They fill from the rear to the front (ie 5,4, 3, 2 and then 1).
7) Re-tighten the injector hard line brackets (8 mm).
8) Reconnect the glow plug harness.

Glow twice for 45 seconds, depress the accelerator pedal and crank the engine.
She should start right up.
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post #6 of 23 (permalink) Old 03-18-2017, 08:30 AM Thread Starter
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Thank you for your help man, i appreciate it. Here are some pics of glow plug 1 that had the issue with the pin coming out
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post #7 of 23 (permalink) Old 03-18-2017, 08:33 AM Thread Starter
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Plug #1 but this looks like its part of the plug? Or is it something im gonna have to dig around town for?
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post #8 of 23 (permalink) Old 03-18-2017, 08:34 AM Thread Starter
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Also is the nut on top of the injector what ill need to loosen? Will i need to loosen all 5 all the way at once? Orr just one at a time at a certain amount turns?
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post #9 of 23 (permalink) Old 03-18-2017, 08:38 AM Thread Starter
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This one. And sorry this website is weird on my phone and im still kinda new to working on this kind of car
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post #10 of 23 (permalink) Old 03-18-2017, 10:48 AM
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Quote:
Originally Posted by Julian Wilson View Post
Plug #1 but this looks like its part of the plug? Or is it something im gonna have to dig around town for?
Yes, that is part of the glow plug that has broken off.

Many people overtighten the nut on the electrical connection.
The nut only needs to be just a little past finger-tight, it's not a mechanical connetion.
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