Hi All,

It looks like I have worked my way out of things that need to be done on my 1984 300D and am moving towards PM issues. My car has 140K miles on it now and I bought it 2 years ago with 107K miles. For the last 10 years prior to my purchase, it was driven about 1000 miles per year.

Right now, the idle is very good and I don't have any specific injector, power, or fuel issues but I want to get them tested as I would like to make sure I have a good spray pattern and I would imagine they probably need to be cleaned at the least. I have started recently adding two-stroke oil with fuel fillups.

In doing these types of things, I tend to have a long-term viewpoint and am more apt to just get the whole thing taken care of in one round so I don't have to revisit this issue in the future.

I am looking for advise from people who have already been down this route.

Should I:

- keep driving the car until there are injector-related issues
- pro-actively rebuild all of the injectors (I have heard issues with quality of nozzles, etc.)
- replace individual injectors or rebuild on an as needed basis
- DIY or take to an injector shop?

Thanks,

Dkr.

It depends on your budget really.
How is you fuel mileage?

You can do a visual inspection to see if the injectors are pitted. You'll most likely need a deep socket, a breaker bar and a pipe (for additional leverage), as well as new injector washers ( about $5 for a set), and possibly new brained fuel hose. Pull each of the injectors and clean them off the tips carefully, if they are heavily pitted/ and original, I would plan on rebuilding them. There is a kit available from a certain Mercedes enthusiast that is DIY for injector rebuilds, otherwise you'll need to find an injector rebuild center, fortunately shipping would be very reasonable.

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Nosce Te Ipsum "Know thyself"

To DIY the Injectors you would need a Diesel Nozzle/Pop Tester.

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84 300D, 82 Volvo 244Gl Diesel

Fuel mileage is fine. At $2.50/gallon, I'm not really keeping track but it's about the same as the other 300D turbos I have owned.

Let's say budget isn't an issue. I just don't want to spend $$$ and time and get something worse on a part that doesn't appear to be broken.

I was thinking about pulling them and taking them to a Bosch shop. Another thing that comes into the DIY part is if I go to that certain Mercedes enthusiast, I may be able to deal with injectors for my other diesel vehicle.

Dkr.

After 100k miles the injectors are worn out. The spray of a nice new nozzle is a cleanly torn mist. Once they wear out, you end up with an injector that "pees" before its pop pressure, and the spray pattern becomes a stream instead of a mist.

Greazzer rebuilds injectors at a very high quality to price ratio. I am very happy with the work he did for me. He balances the injectors to less than factory spec tolerance and gets the pop pressures dead on.

If they are over 100k you should have them rebuilt. Monarch nozzles are currently the best, along with Bosio. PM Greazzer and he'll tell you what you need to do.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
http://badges.fuelly.com/images/sig-us/302601.png
http://i959.photobucket.com/albums/a...0/sideview.png

just keep driving, but if you can go the downtime & modest investment of new nozzles + Greazzer's service is the way to go in terms of best bang for the buck.

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1991 300D

What does he charge for the rebuild service?

Dkr.

Just keep driving....Is some of the WORST information to spread about these cars....I suppose if you plan is to just buy another car after 5 years so be it....but if you want a reliable ride....Do the normal maintenance these cars require....I mean yes you can run on the same fluid but really do you want to see the damage running on 30 year old fluid can do?...Running injectors that have 140k miles on them can melt the pistons....along with more carbon build up and a million other pitfalls....I believe the FSM says to replace/test/rebuild injectors every 15k miles...

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Dunno. PM and ask.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
http://badges.fuelly.com/images/sig-us/302601.png
http://i959.photobucket.com/albums/a...0/sideview.png

I just rebuilt my injectors with Bosio nozzles. I spent $175 for a set of 5. They made a huge difference. You will need a vice and an impact to take apart the injector itself.

Other than those you'll need a 1 1/16" deep socket, a breaker bar, 17mm wrench, needle nose pliers, needle nose vice grips, a flathead, and lots of carb spray to clean the injector housings and the screw holes on the head.

You need the needle nose vice grips and the flathead to bend the overflow bibs on the injectors in and out in order to fit the socket around it.

It's a simple job, you just need to assemble the injector back correctly and make sure you thoroughly clean the threads on the injector and its screw-in. The directions on dieselgiant are good.

Also don't forget to buy new overflow hose line and heat shields.

First you need a pop tester, no ifs ands or buts....They need to be pop tested and shimmed...Second don't use carb cleaner...stuff is highly toxic....soak them in gasoline or use a parts cleaner....Third they need to be lapped...

They are not like changing a spark plug, there is precision that needs to be followed...That is why member greazzer is recommended..

Also dieselgiant and the Msource are two places to avoid like the plague..

This is a good thread to read...
http://www.peachparts.com/shopforum/diesel-discussion/299321-diesel-injector-cleaning-diy.html

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^ exactly.

You MUST pop test them and do it correctly. You will end up worse if you try to half ass it. PM Greazzer, ask him for the skinny, proceed from there. I bought Monark nozzles and sent them to him with my whole injectors. He cleaned them, installed the new nozzles, pop tested them, and balanced them as a set. I was more than happy to pay him for his work as it came with all of his experience and I didn't end up with a pop tester that I'd never use again.

Greazzer uses a multi step bath of chemicals if I remember correctly. Whatever it is, it makes the injectors look beautiful. They came back to me in the white and looked like new.

__________________
'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
http://badges.fuelly.com/images/sig-us/302601.png
http://i959.photobucket.com/albums/a...0/sideview.png

from an on-line commercial diesel maintenance source and am very pleased with them.

The mercedes
Some bad advice (in my opinion) you received here:

• Do NOT bend the overflow spigots to fit them into a socket. At best you will gouge them making leaks a certainty or at worst break them off requiring purchase of a new injector body. The proper special socket is available that has a relief machined into it to fit over the injector body. This site offers it.

• I don't think you need rework the injectors every 15k miles. I haven't seen the FSM that says to do so but I could be wrong on this one. Every three years or maybe 50k miles seems right to me. Greazzer may know better. Of course if you experience related performance problems do them sooner.

Don't forget to replace the heat sinks every time you r&r an injector.

Service only is $99.00 shipped CONUS for a set of 4 or 5.

'greazzer', he can do it !!

honestly, he is very trust worthy and competent.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD