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  #1  
Old 02-22-2005, 05:32 PM
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How big a problem is a prechamber leak?

I noticed yesterday that there are small, bubbling leaks around the base of two of my injectors. The bubbles were popping up at the outside threads of what looks like an insert that the injector threads into. (Is that the collar?) The injectors themselves appear dry, so I do not think it is a leak in the return lines. I harvested a photo from an existing thread and put in an arrow to show the origin of the leak.

A search for "prechamber leak" shows lots of threads on this problem, removal of the collar and the prechamber, etc. But I got little indication on how severe a problem this is. Since my engine currently runs fine, can I just ignore this for now or is it a problem that is going to worsen or become harder to eventually fix?
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How big a problem is a prechamber leak?-dsc_0003a.jpg  
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Old 02-22-2005, 07:30 PM
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My 240 does the same. May make it knock a little more than usual. Just pull the injectors and replace the "seats"

JH
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Old 02-22-2005, 07:30 PM
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oops, sorry. scratch that, i just looked at your picture...
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1980 500SE/AMG Euro
1981 500SEL Euro
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1986 190E 2.3-16
1986 190E 2.3
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2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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Old 02-23-2005, 09:30 AM
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Hey,
I had the same exact problem. I took the injector out. Took it apart and cleaned it real good and put it back in.
Also remember to replace the brass heat shield too.
Find out how much torque the injectors take, it's not that much but I can't remember right now.
After putting it back in the leak stopped. Also if they are the original injectors don't buy a replacement. You'll wind up with an inferior "Made in India" injector.

Edit: Sorry I just remembered my injector was leaking from the middle where it screws together. You may want to double check that. Remove the rubber boot if you have one and take a good look.

Danny
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  #5  
Old 12-31-2005, 05:57 AM
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I'm interested to know the answer to this question too. Any body know if it is harmful?
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  #6  
Old 12-31-2005, 12:11 PM
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I had one doing that. I used a punch on the slotted nut that holds the pre-chamber in, 2 good whacks to snug it down and no more leak.

I know, I should have pulled the pre-chamber, cleaned, inspected and re-seated to proper factory specs. That will have to wait until all the other issues with it have been worked out.
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