Installing new M103 fuel injectors, How sould they be oriented? - PeachParts Mercedes-Benz Forum

bolomiester · #1 09-14-2009, 12:49 PM

This is an extention of this long running thread:

http://www.peachparts.com/shopforum/showthread.php?t=254113

I'm finally down to replacing the fuel injectors in an effort to cure a start/stall/start/chug-chug/run behavior that I started working on in June.

I was going to replace them over the weekend but had to make a quick trip 500 mile round trip to St. Louis instead. Anyway, I'm doing it today and will post the results on the original thread for the benefit of everybody that's been following it, looking for a solution to the same problem on their own cars.

However, I have a couple of questions for our MB masters. See the photo below. The first is the "slots or windows" that are in the holder below the O-ring. Do they need to be oriented in any particular direction, say fore and aft or side to side? The second is the O-ring. The new one is not as "fat" as the original, I got all the parts from Fastlane, so I assume they are correct and perfect but I just wanted to be sure. Also, the o-ring is a very tight fit over the holder, so is there a "good" way to get them over the two "ridges" and into their groove without damaging them?

The last question is the seal. Should it go over the injector first and then into the holder, or should the seal go into the holder first and then have the injector pushed into assembly. I'm sorry for what must be dumb questions, but I've never replaced fuel injectors before, and I'd like to be sure I get it right the first time. Unfortunately the CD doesn't say much.

Thanks, for all the help on this process. I have high hopes on the injectors being the problem, as I sprayed the allen bolt and fuel line connections with PB blaster this morning, then took the car for a drive to get it nice and warm, then came back and sprayed everything down again. I then pulled the first injector as soon as I figured out the process, maybe a 15 or 20 minute delay, and when I broke the fuel line loose there was almost no pressure. Seems like a leak to me. I have my fingers crossed.