Injector Questions on my 300SDL - PeachParts Mercedes-Benz Forum

Putty · #1 07-12-2008, 06:16 PM

Well, my friends at Diesel Giant have me just about sold on new Injector Nozzles on my 300SDL.

It looks easy enough to do but I have my reservations. For instance, Im unfamiliar with the term "pop testing". What does that mean?

Im also wondering what would happen if I did it myself...what would be the hinderances?

Bozzio nozzles look like the way to go for me but I just want some professional advice.

Ive read some of the threads on the subject but am unsure if they apply to my model and year Merc...times like these I ask myself..."what would Brian Carlton do?"

#2 07-12-2008, 06:24 PM

Quote:

Originally Posted by Putty

Im also wondering what would happen if I did it myself...what would be the hinderances?

You need a selection of different thickness shims to adjust the pressure.

Brian Carlton · #3 07-12-2008, 06:24 PM

Did you have a thread on any fuel injection issues?

If you're already sold on the injectors, we really can't help you.

Pop testing allows a person to know the exact point (psi) where the injector opens...........it's preferable that all six be quite close to each other for a smooth running engine.

There are certain risks in changing nozzles...........sealing the nozzle to the holder is an issue...........there is no gasket. Additionally, it would be very rare to have a set work properly without checking and adjusting the pop pressure after the new nozzle is installed.

Putty · #4 07-12-2008, 06:50 PM

Quote:

Originally Posted by Brian Carlton

Did you have a thread on any fuel injection issues?

If you're already sold on the injectors, we really can't help you.

Pop testing allows a person to know the exact point (psi) where the injector opens...........it's preferable that all six be quite close to each other for a smooth running engine.

There are certain risks in changing nozzles...........sealing the nozzle to the holder is an issue...........there is no gasket. Additionally, it would be very rare to have a set work properly without checking and adjusting the pop pressure after the new nozzle is installed.

Im not necessarily sold on the idea...I love my car and dont want to hurt it. If it would be in my best interests to have a tech do it...then thats what I will do. It seems that many of the competent merc mechanics recommend injectors done in a shop rather than a driveway. Thanks guys!

Hatterasguy · #5 07-12-2008, 10:21 PM

I wouldn't spend a dime on any new or rebuilt injector parts until you have your currant 6 tested. Their is no reason to replace them if they are poping good and spraying well. If any are not just fix those.

Buying a set of nozzels and screwing them on yourself is a waste of time and money. You have no idea if the pop pressure is anywhere close, or even if the spray pattern is good.

Find a diesel injection shop, remove yours and have them tested. Take it from their.