Fuel Injectors m117 - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 09-18-2016, 09:47 AM Thread Starter
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Fuel Injectors m117

First of all thank you to those who responded to my cold start valve thread. I am constantly learning more about my 72 280 SE 4.5 daily.

Now I face the issue of replacing a fuel injector. It looks like one of the injectors is a bit beat up at the electric plug. I have priced out the
Bosch units and was wondering if anyone has had success with the rebuilt units or other brands that cost a fraction of what Bosch is asking?
Also the male plugs on the wiring harness side seem to be difficult to source. I found a terminal repair plug kit from Autohaus AZ, but it appears
completely different from what I currently have and need.

Also do I need to replace the one damaged injector or shall I be looking at replacing all 8 injectors?

Thanks

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon

Last edited by tewfiks; 09-18-2016 at 09:49 AM. Reason: forgot another question
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post #2 of 12 (permalink) Old 09-18-2016, 03:12 PM
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Originally Posted by tewfiks View Post
First of all thank you to those who responded to my cold start valve thread. I am constantly learning more about my 72 280 SE 4.5 daily.

Now I face the issue of replacing a fuel injector. It looks like one of the injectors is a bit beat up at the electric plug. I have priced out the
Bosch units and was wondering if anyone has had success with the rebuilt units or other brands that cost a fraction of what Bosch is asking?
Also the male plugs on the wiring harness side seem to be difficult to source. I found a terminal repair plug kit from Autohaus AZ, but it appears
completely different from what I currently have and need.

Also do I need to replace the one damaged injector or shall I be looking at replacing all 8 injectors?

Thanks
If the one injector is just physically damaged, you could just replace that. But I would only do that if you can get another Bosch. Many of the ones on sites like Rock Auto will work, but are of a different design - multiport, disc type etc. Don't know what happens if you mix them up. There are no new cheap injectors and Bosch have stopped making. But the ones you can get from places like Rockauto will no doubt work. 1972 MERCEDES-BENZ 280SEL 4.5L V8 Fuel Injector | RockAuto

Regarding the plugs, you can get these from a number of sources. Some in pieces with separate terminals and plastic body. Other assembled with pigtails. If you check this post, you can determine whether your terminals are crimped or not. That will help determine what you need to buy. There is a company in Germany (Repro-Parts) that can supply the connector parts as well as the rubber boots. Some of us switched to a different type and completely rebuilt the harness, but the original type will work too. Problem is that the wiring and the covers has been cooked for 40+ years and is not so easy to repair. Ceck posts by Cushjbc on the 107 forum. He knows a lot about rebuilding harnesses!

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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post #3 of 12 (permalink) Old 09-18-2016, 05:46 PM Thread Starter
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Many thanks for you knowledge and insight on my issues. You are correct in stating the wiring has been cooked. Everything is so very brittle, that I am certain once I start this process the least frustration will be with completely replacing the harness. My 108 was a one family car since new, but was left out in the Arizona sun for the better part of a decade. It was baked/dry rotted both inside and out.

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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post #4 of 12 (permalink) Old 09-18-2016, 06:24 PM
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Originally Posted by tewfiks View Post
Many thanks for you knowledge and insight on my issues. You are correct in stating the wiring has been cooked. Everything is so very brittle, that I am certain once I start this process the least frustration will be with completely replacing the harness. My 108 was a one family car since new, but was left out in the Arizona sun for the better part of a decade. It was baked/dry rotted both inside and out.
I started out intending to just replace the rubber boots on my harness. Ended up rebuilding it from the main large harness to all injectors and sensors. Documented here: http://www.benzworld.org/forums/r-c1...t-project.html Apparently replacement harnesses are no longer available. They were heading close to $1000! If you like that sort of thing, some of us could help source parts. Another SL owner, Brad (cushjbc) is a great resource if you are considering an upgrade. Our 350/450SLs have virtually same engine parts as your 4.5L

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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post #5 of 12 (permalink) Old 09-18-2016, 07:34 PM Thread Starter
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harness rebuild

Yes I am interested in constructing my own harness at this point. I will continue to read up on the threads mentioned. This is the part I began thinking about redoing the wiring:

http://www.autohausaz.com/search/pro...Terminal%20Kit

But as I said this does not appear to fit my injectors.

I will be asking many questions on where to obtain the correct parts to make this a reality.

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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post #6 of 12 (permalink) Old 09-18-2016, 09:02 PM
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I'm hoarding a few 4.5 w108 wiring harnesses. One in my running but smoking tan 1973 280se 4.5. The wiring harness is much better in my parts car 1973 280sel 4.5. I also recently purchased someone else's rebuilt w108 harness and fuel rails. This is just the type of stuff I've been squirreling away in preparation of working on mine.

In your case, I would only worry about replacing the injector if it wasn't flowing right.

Inexpensive used parts come to the patient and diligent searchers.

.

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post #7 of 12 (permalink) Old 09-19-2016, 06:16 AM
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Quote:
Originally Posted by tewfiks View Post
Yes I am interested in constructing my own harness at this point. I will continue to read up on the threads mentioned. This is the part I began thinking about redoing the wiring:

http://www.autohausaz.com/search/pro...Terminal%20Kit

But as I said this does not appear to fit my injectors.

I will be asking many questions on where to obtain the correct parts to make this a reality.
That is not the right part for these cars. The links I provided previously showed what was in there originally.

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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post #8 of 12 (permalink) Old 09-19-2016, 06:38 AM Thread Starter
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Thanks for confirming that these are the incorrect plugs for the injectors. They don't look like they would fit.
I have been reading through the threads posted and am trying to figure out what parts to buy and from where....

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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post #9 of 12 (permalink) Old 09-19-2016, 11:47 AM Thread Starter
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Question sources

I have read all the threads and my question is which way did you go? The Audi/VW plugs with original boots?
The Audi/VW part numbers seem easy to locate, but the boots are another story. I did read that someone ordered them from Germany.
Any other options stateside?

How many of each plug and therefore boots?

Thanks

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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post #10 of 12 (permalink) Old 09-19-2016, 12:25 PM Thread Starter
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plug images

Here is an example of the plug that I am dealing with and the condition they are in.
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Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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