bubbles around my injector 603 3.5 - Page 2 - PeachParts Mercedes-Benz Forum

peragro · #16 06-28-2006, 12:32 AM

Quote:

Originally Posted by amosfella

I had a similar problem with my 300 SDL, and I can't remember the technical terms for the parts there, but I'll do my best to describe the problem and how to fix it.
If you remove the injector, there is a housing underneath, basicly from a casual glance, it looks like a pipe with a slot cutout on each side. when you remove this, there is a washer underneath to seal it. If this washer is cracked, it will allow compressed gas to escape through the threads. This can cut the threads, causing a BIG problem. The washer was a $5 part from the dealer. Not too hard to change. All you need to take the housing out is a 1/4 flat iron that is the width of the housing, and a crescent wrench to turn it with. Just don't turn it back in too tightly when you're reassembling it.

I was wondering if it might be something as you describe. I'm not real familiar with the anatomy of the injector as it sits in the engine. But since many of mine have the bubbles I thought this might be indicative of all of them working loose over time or a washer degrading over time. I think that I remember reading somewhere that there is a crush washer under each injector. Of course, I could have made that up - I don't know. What's the opinion from the forum? Do you think that something might work loose over the course of a 1/4 million miles? I'm thinking that I should probably just order six washers or whatever they are and re-install the injectors. Seems like a kinda straightforward job...

amosfella · #17 06-28-2006, 03:35 AM

If they are torqued correctly, they shouldn't work loose, so, I'll go with a cracked washer. Let me know what you find.

t walgamuth · #18 06-28-2006, 07:06 AM

that crush washer thing is called a seal i think. i have several that want to work loose repeatedly. we finally used red locktite to hold them in.

tom w

amosfella · #19 06-28-2006, 10:11 AM

Quote:

Originally Posted by t walgamuth

that crush washer thing is called a seal i think. i have several that want to work loose repeatedly. we finally used red locktite to hold them in.

tom w

It could be called that I suppose. It's an aluminum washer. It that the one you're refering to??

t walgamuth · #20 06-28-2006, 08:11 PM

that is it. i did not make up the name.

tom w

amosfella · #21 06-28-2006, 08:18 PM

then it's a seal.

ssorange · #22 07-14-2006, 05:26 PM

Quote:

Originally Posted by t walgamuth

that crush washer thing is called a seal i think.
tom w

You were close, I believe it is actually called a "sealing plate" even though it is a sealing washer.... I guess it gets lost in translation!

miner · #23 07-15-2006, 12:56 PM

The FSM for the 617 shows the seal ring installed between the prechamber and the head. The collar should be screwed down directly onto the prechamber. I wouldn't think you would want to put another sealing ring between the collar and the prechamber. The sealing ring is narrower than either. Here is a link to the diagram I am looking at:

http://mb.braingears.com/123_DISK2/program/Engine/617/07_1-230.pdf

So if you want to replace those sealing rings you need to pull the prechamber. They also seem to come in two different sizes, 2 mm and 2.3 mm. The part site I looked at says 2 mm is standard.

I too have some bubbles at the base of the injectors, by the way.

EDIT: Just noticed you guys are talking about the 603 mostly. So what I said probably doesn't apply.