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  #1  
Old 12-04-2008, 08:36 PM
Actros617's Avatar
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Question Injector replacement question....

I am about to replace my injector tip in my 300SD, so after i remove the injector and R&R my tip reinstall the the injector torque it and install it back, do i have to any fuel priming????

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  #2  
Old 12-04-2008, 08:59 PM
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No, but on your car you can so you don't have to crank the engine as long. Be sure to use new heat shields. It's also a good idea to test the new nozzles before reinstalling.
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  #3  
Old 12-04-2008, 11:16 PM
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yes i do have new heat shield, now how do i test the new nozzles, use a injector test bench
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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi
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  #4  
Old 12-05-2008, 01:39 AM
toomany MBZ's Avatar
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^^I would think.
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  #5  
Old 12-05-2008, 02:20 AM
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If no one else had mentioned it the 2 parts of the Spray Nozzle cannot be interchanged with the other Spray Nozzles; keep the parts together.
Likewise do not mix the parts of an 1 Injector keep all the parts (except the Spray Nozzle you are changing) from each Injector together with that Injector.
There is a hand pumped Injector Nozzle Tester with a Gauge on it used to test the Opening Pressure of the injectors. If you want to see what they look like do an Ebay Search "Diesel Injector or Nozzle Tester".
Also when Injectors are rebuilt the lap the precision surfaces inside of the Injector which makes a good sealing surface. If you just swap the Spray Nozzles besides the chance of gettin dirt trapped between those surfaces it just plain my leak a little between the Injector Body and the Nut.
Also to set the Opening Pressure you need to swap different sized shims that go on one end of the spring inside of the Injector and put the Injector on the Nozzle Tester to see what opening pressure you are getting.

To bleed the air from you system leave the Hard Line Nuts up by the Injectors a little loose and crank (with out overheating your Starter or killing the Battery) until you see fuel spurting out from under the nuts. Tighten the nuts and start the engine.
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  #6  
Old 12-05-2008, 10:47 AM
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This is great info thx for the input all, also what about the oil in the injector nozzles, do i have to wash it off with diesel additive or just put it it, i also going to clean my injector housing while i am at it too i ll see how it goes...
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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi
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  #7  
Old 12-05-2008, 02:14 PM
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I just made sure all the parts were clean when putting them back together. I sprayed them with brake cleaner. I installed new nozzles a while back. Be sure to tighten the two parts very hard. I followed DG's advice to not gorilla tighten, should'nt have done that, as I had to take 'em back out and do so.
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  #8  
Old 12-05-2008, 02:45 PM
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Keep everything clean as possible.

Dip the cleaned internal parts in clean diesel fuel just before putting them together - NEVER leave anything dry. If you have a torque wrench..

injector halves -
1. 30ft lbs leave it a minute then loosen.
2. 60 ft lbs " " "
3. 65 ft lbs leave it.

injector into head - 55ft lbs or 75Nm.
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  #9  
Old 12-05-2008, 03:07 PM
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Quote:
Originally Posted by Actros617 View Post
how do i test the new nozzles, use a injector test bench
You probably can skip the "testing" unless your feeling really unlucky. I have just "swapped in new nozzles and away you go", chances are your fine. That said, I recently sprung to have new nozzles balanced and tested for both my 240s, nice idle now, Depends if you wanta spend the $ Always new seals tho.
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  #10  
Old 12-05-2008, 03:24 PM
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Isn't the injector body torque value 70-80 NM?

I would not install a set of nozzles with out pop-testing. I have rebuilt sets using the original shims and usually one or two injectors are quite a bit off. Springs wear, and you are also using a different nozzle design and manufacturer.
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  #11  
Old 12-05-2008, 04:39 PM
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Quote:
Originally Posted by bgkast View Post
value 70-80 NM?

I would not install a set of nozzles with out pop-testing.
I wouldn't either now that I know the pleasure of a smooth idle also having the feeling I did the best I could to have my babies running well. Heck, I've pulled injectors from parts cars, stuck em in, down the road I go. It runs. Nah, I'll have em tested now
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #12  
Old 12-05-2008, 04:44 PM
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I would like to test them but those diesel store DELCO if you ever heard it and the only one in my state is going to charge me $25 buck for 1 injector to test... that like $125 for all of them its a rip off...REALLY
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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi
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  #13  
Old 12-05-2008, 06:58 PM
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I have a pop tester in my garage but it got stuck and I couldn't fix it before I installed my new Bosio nozzles. So I took my chances and installed the new nozzles without testing. After they broke in & settled, the engine was as smooth & quiet as with the old Bosch nozzles that I knew were balanced. So I guess I got lucky. Keep in mind though that initially the pop pressures will be slightly different than after break-in. So it's a waste of time to be too picky about the pressures with brand new nozzles. If you reuse the same internal parts from each injector, I think there's a good chance the new nozzles will be balanced after break-in if not before. Testing, especially for spray pattern, is more useful with the lower quality nozzles like the made-in-India Bosch. I'd never install those without testing.
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  #14  
Old 12-05-2008, 08:35 PM
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Not to pimp my self, but I test and balance them for $10/each for forum members
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  #15  
Old 12-05-2008, 08:53 PM
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Quote:
Originally Posted by bgkast View Post
Not to pimp my self, but I test and balance them for $10/each for forum members
Keep on pimping.... we lov ya B.

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