Anyone had any weeping around there after reinstalling new injectors?

The return lines are all new, the hardline nuts are fine, the injector body is dry, I was very thorough about cleaning surfaces before installing the new heatshields...

The only two things I can think of are either a re-torqueing of my injectors (was my first time using a torque wrench so possible I didn't tighten them enough) or that I'd slightly loosened the prechamber collar nut when removing the old injectors.

Does that seem reasonable?

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1981 240D 4sp manual. Ivory White.

Give it a couple days. Any fuel spilled down in the prechamber or around the collar will boil off and show up as bubbling. Give it a couple days and it should go away and dry up.

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Current stable:
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It’s been a few months actually. I thought that might have been the issue so I degreased and cleaned the entire engine, dried it off fresh and after a couple days cylinder 1,2 and 4 we’re back to shiny -3 is bone dry.

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1981 240D 4sp manual. Ivory White.

The collars loosening is common, either on their own or when taking the injectors out, so that could very well be it. Tightening them back down normally fixes the problem, just make sure you use the correct tool or you'll have a bigger headache. The leaking fuel comes up from the prechamber, BTW, so the injectors should be good if you followed the correct procedure there.

-Rog

On a similar topic, my 82 240D has an oil leak around the collar behind the PS pump on the block where the 19mm plug is.....any fix there??

Seemed like a specialty tool... how difficult are they to come by?
Also, as I’ll have to remove my injectors to get at the collars, I guess that means I’ll need new heat shields again?

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1981 240D 4sp manual. Ivory White.

Yeah, new heat shield any time you take the injector out. Some advocate reshaping the old ones and reusing but you'll have to make your own decision about that.

If you search Google for "Mercedes 617 prechamber collar tool" you'll find them for sale. You can also make your own, but they're not super expensive, especially knowing it'll work right the first time and not having to spend half the day making a tool is money in the bank. Again, you can decide for yourself.

-Rog

Thanks Rog, that’s really helpful.
I’m getting some conflicting information about whether it’s even possible for fuel to pass through the collar -have been told only gas?

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1981 240D 4sp manual. Ivory White.

Basically the fuel is coming out of the tip of the injector as it should, but the teeny tiny gap from the prechamber collar being loose allows the pressure inside the prechamber to force a small amount of unburned fuel up and out around the collars. It's much different than the gasoline engines, so I would exclude those from any explanations you find.

-Rog

Yeah I wrapped the injectors, hardlines, return lines in paper towel and went for a drive. Towels were dry when I took them off. It has to be coming from down there.

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1981 240D 4sp manual. Ivory White.

Mine "leaked" for a few days but boiled away.

I swear that to tighten the collar nut is the same thing used on bicycles tools...

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Don't forget to grease the screw and threads on the spring compressor.

As much as his parts and services are controversial on here, dude over at merceds-source has a tool for doing it. It looks like he took the appropriate sized impact socket and milled the end into a spanner for tightening those. He also has a plunger in the middle with a bolt so it can expand and hold the tool in the collar so it doesn't jump out.
Some of his products may or may not be snake oil, but this one is at least a clever design you could probably rip off and make your own for $5 at harbor freight.

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...

I saw it. I've bought tools from him before, I think he's a good guy. This is just one of those areas you want to be sure about before investing in yet another $80 tool... more so for the slide hammer.

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1981 240D 4sp manual. Ivory White.

you need the slide hammer for pulling the prechamber out,

Sure, but figured it might be just a little further afield if tightening the collars wasn't enough and I had to pull the chambers for cleaning.

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1981 240D 4sp manual. Ivory White.