300sl fuel injectors - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 01-24-2017, 03:31 AM Thread Starter
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300sl fuel injectors

Hey guys,

I have been chasing down a rough running issue for a couple of months, gradually changing out parts that i think are contributing to the issue as fast as i can save the money to do so. Im at the stage where i need to get this sorted otherwise the car won't get registered in time and will have to have a full inspection which is a massive pain!
I have reached a point where i am a bit stuck in terms of the fuel injectors. i pulled them out a couple of weeks ago and the rubber seals are completely dead so that would be a major factor in why its running rough, they're also covered in soot which i assume is a bad thing.
The main issue i have though is that i am not sure whether or not i need the plastic casing that goes around the injectors. None of the injectors currently in there have these sleeves in place and they seem to fit well into their existing position but everything i look at has these sleeves.
Could someone please advise or show me what their m103 engine injector set up looks like as well as the part number for the rubber seals (i have the injectors number).
I will attach images ASAP.

Thanks as always!
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post #2 of 12 (permalink) Old 01-24-2017, 03:55 AM Thread Starter
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First image is the injector hole, note there is no sleeve in it.
Second image is the condition of the injector and the seal
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post #3 of 12 (permalink) Old 01-24-2017, 02:08 PM
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You're definitely missing a sleeve. Attached is the EPC diagram and the corresponding part numbers. You should do a pressure and spray test of the nozzles. Mercedessource.com has a wealth of information on the topic.

Good luck!
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Stay flexible - keep smiling
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post #4 of 12 (permalink) Old 01-25-2017, 02:14 AM
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I did this recently. You need the plastic sleeve for thermal protection of the injectors and sealing. You need the rubber ring for the same reasons. Get them all.

My rough iddle, if you have it, was due to a dirty & not freely moving ICV (idle control valve? auxiliary control valve?) whatever it's named. Even after cleaning it. Bought a new one and perfect. Just in case that's the next thing you stumble upon...

107's wiki:
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Looking for original backseats + their hardware.
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post #5 of 12 (permalink) Old 01-29-2017, 02:29 AM Thread Starter
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Thanks for the help guys, i will order the parts soon!
it turns out that the plastic sleeves are shorter in the 103.982 engine for some reason, at least from what i can tell. So they don't actually stick out of the header at all. not quite sure how to remove them though!
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post #6 of 12 (permalink) Old 01-29-2017, 02:49 AM
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Hi can i ask what engine you have , is it the m104 or m103 ?
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post #7 of 12 (permalink) Old 01-29-2017, 05:00 AM
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He has a 103.982.
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post #8 of 12 (permalink) Old 01-30-2017, 08:43 AM
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They slide out more or less easy. I remember doing it by hand carefully. Nothing too difficult.

107's wiki:
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post #9 of 12 (permalink) Old 01-30-2017, 08:47 AM
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Actually I did a DIY about it! I didn't remember.

I hope I am not breaking any rules posting a link to another forum?

Cambio de inyectores en M103 - Foro Club w107 Espaņa

You can see pictures of the plastic sleeves, injectors, etc of my m103.

107's wiki:
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post #10 of 12 (permalink) Old 02-02-2017, 10:41 AM
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@bereng Thanks a lot, that's just what I was looking for. I wanted to tackle this in the coming spring. Any chance you have an English version, the google translate translation is a bit wonky.

@mods - maybe something to add to the Encyclopedia?
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