Fuel injectors o-rings

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MMansilla - 03 May 2006 22:40 GMT

Hi, I'm preparing to replace the fuel injectors of my 124, 230E 92, 102.982 engine. I bought the parts from the local MB dealership, and they sell me the injectors and a black rubber seal (they called it "guide") that is mounted at the bottom long rod of each injector, to seal them with the cylinder head. The dealer´s attendant said that there is no other part involved in this job.
Well, it is the official MB dealer here, so I would have to believe them. However, searching this NG and the web I've realized that there is another o-ring/seal that I could be missing, one that seals the injector with the fuel rail on the rear upper end of the injector.
I'm doing this replacement to solve a slight hard warm starting issue, and to improve a sometimes vibrating idle, therefore it is important not to leave any air leaks.
Is the dealer right?
Thanks
MMansilla

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Jens - 04 May 2006 21:19 GMT

Yes, the dealer is right. That is the only thing that adapts the
injectors. The injectors are the fixed wit a bracket for each two
cylinders.

The seals must have the right softness (will harden with age) to ensure
tight fit.

But do you really need to replace all injectors ? (well, you will of
course then have a good feeling that all is OK)

They can be tested whether they open at a certain pressure difference,
that the remain closed below that threshold and that they provide the
right spray pattern above the threshold.

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MMansilla - 05 May 2006 18:26 GMT

I appreciate your answer Jens. Now I'm ready to undertake the injectors
replacement.
Do I really need it?. Well, I' don´t know for sure. I would have carried
out the test you mention to know (wasn't aware of it). As you insinuate,
mesurements are the only way to proper diagnosis.
In addition, the car´s engine (with 90 kmiles), is in general fine, the warm
start and idle problems are just marginals.
However, at this point with the injector already bought, I have no choice
but to change them all. They were relatively cheap, only US$100 for the
parts, compared to ultrasonic cleaning for $75 (seal replacements included
in this one). So, cost wasn't a concern.
My main concern is, though: the job seems easy enough, but I'm
unexperienced, and in such a case the saying "the enemy of good is better"
becomes more meaningful (maybe this is the point that lies behind your
question).
I really like the car, so I hope to do a good job. That´s why I was asking
about the seals/o-rings.
Thank you.

MMansilla

> Yes, the dealer is right. That is the only thing that adapts the
> injectors. The injectors are the fixed wit a bracket for each two
[quoted text clipped - 9 lines]
> that the remain closed below that threshold and that they provide the
> right spray pattern above the threshold.

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