606 Fuel Injectors Rebuild Thread - PeachParts Mercedes-Benz Forum

Dalakian · #1 03-04-2013, 05:25 PM

Hi everyone,

Since I'm tearing apart my engine, I've figured that I might as well rebuild my fuel injectors. Has anyone attempted to build their own fuel injector tester with success? I've read multiple threads of people building them themselves, but a lot of people are complaining that the home made ones don't work as well as ones bought in the store. I've come across one from mercedes source and was wondering if people have bought anything from that place before?

This is the one that I'm talking about:
https://mercedes source (dot) com/node/5180

The only thing that I don't like about it is the price of $190+tax (I live in Washington)

On top of that I need fuel lines + shims + injector socket. It all adds up close to $400 just to rebuild my injectors.

Thoughts? Comments? Suggestions are appreciated!

Thanks.

Zulfiqar · #2 03-04-2013, 05:34 PM

Best thing to do (if your car is out of service and you have something else to drive around) is to send these to a diesel repair shop to get them tested, best get some new nozzles (DN0-SD310) are required for your car.

the cost will be lower.

Dalakian · #3 03-04-2013, 05:52 PM

Zulfiqar,

I enjoy doing everything myself + I do plan on doing it on regular basis. Here's what I'm thinking right now (after all of my other problems are over)

1) Replace old fuel lines (they are still clear but hard as a rock)
2) Replace fuel filter + pre filter
3) Replace fuel injector return lines (I'm 99.9% sure that they are leaking)
4) Rebuild the injectors

In order to rebuild the injectors I'd like to do the following:

1) Order POP tester ($190) from mercedes source
2) Test injectors before disassembling.
3) Get Monark nozzles (thoughts? comments? is bosch better?)
4) Rebuild and test/adjust using new nozzles and the tester
5) Compare results + post here

I'm a die hard DIY'er and would rather spend money on tools then services because I can reuse tools later on.

engatwork · #4 03-04-2013, 07:02 PM

Hard to beat the services of an authorized Bosch injector shop

.

KarTek · #5 03-04-2013, 07:09 PM

I built my own pop tester for about $50 and bought a set of nozzles for around $250 I think.

The real trick is finding the right shims for the injector pressure setting. They are unique to the OM 604, 5, 6 and not readily available as far as I've seen. I ended up getting a guy to come over who had a set and we tallied up the number of shims we used and I paid him for them.

Diesel911 · #6 03-04-2013, 07:11 PM

The Mercedes Source one is also Homemade; built with a Hydraulic Jack.

If you look at the Homemade Pop Tester threads I think there is a trend that the Horbor Freight Hydraulic Jacks might not have enough quality to reliably make a good Pop Tester.
Also I think on the Mercedes Souce one they did some Welding and that is not what I recall on the DIYs.

KarTek · #7 03-04-2013, 07:19 PM

Quote:

Originally Posted by Diesel911

The Mercedes Source one is also Homemade; built with a Hydraulic Jack.

If you look at the Homemade Pop Tester threads I think there is a treand that the Horbor Freight Hydraulic Jacks might not have enough quality to reliably make a good Pop Tester.
Also I think on the Mercedes Souce one they did some Welding and that is not what I recall on the DIYs.

I can verify that regarding the HF jacks. Mine sprung a leak not long after using it. The seals just aren't made for thin diesel fuel.

Dalakian · #8 03-04-2013, 07:33 PM

You're saying that new nozzles will run me around $250?! I thought that I could buy a set of rebuilt injectors from mercedes source for around $350 all-together, without core charges?

Sounds incredibly expensive... I will do some more research but last time I've checked the nozzles were not nearly as expensive as you're saying. Hmm...

Does anyone have good experience with running Diesel Purge through their system and seeing any noticeable results? I'm not ready to dump another $300 into the injectors alone.

SirNik84 · #9 03-04-2013, 07:40 PM

My dad made this pop-tester last week fallowing the instructions in this thread.

PeachPartsWiki: How to build a Diesel Injector Pop Tester

In the thread they welded a nut to the bottle jack. My dad took the bottle jack nut to the machine shop at his work and had them make him a stainless steel adapter to pipe thread. He also welded the bung on the back of the bottle jack body. The quick disconnect is so the tank/filter assembly can be removed and the whole thing fits in a tin Christmas cookies came in

Best part about this... after linking dad to Peach Parts, helping him get some parts for the tester, and helping him test the injectors for his Ford. He gave me the tester! THANKS DAD!

KarTek · #10 03-04-2013, 08:04 PM

Quote:

Originally Posted by Dalakian

You're saying that new nozzles will run me around $250?! I thought that I could buy a set of rebuilt injectors from mercedes source for around $350 all-together, without core charges?

Sounds incredibly expensive... I will do some more research but last time I've checked the nozzles were not nearly as expensive as you're saying. Hmm...

Does anyone have good experience with running Diesel Purge through their system and seeing any noticeable results? I'm not ready to dump another $300 into the injectors alone.

Sorry, don't take that as gospel. I was trying to remember the cost off the top of my head.

Zulfiqar · #11 03-04-2013, 10:16 PM

Quote:

Originally Posted by Dalakian

Zulfiqar,

I enjoy doing everything myself + I do plan on doing it on regular basis. Here's what I'm thinking right now (after all of my other problems are over)

1) Replace old fuel lines (they are still clear but hard as a rock)
2) Replace fuel filter + pre filter
3) Replace fuel injector return lines (I'm 99.9% sure that they are leaking)
4) Rebuild the injectors

In order to rebuild the injectors I'd like to do the following:

1) Order POP tester ($190) from mercedes source
2) Test injectors before disassembling.
3) Get Monark nozzles (thoughts? comments? is bosch better?)
4) Rebuild and test/adjust using new nozzles and the tester
5) Compare results + post here

I'm a die hard DIY'er and would rather spend money on tools then services because I can reuse tools later on.

thats really cool, I was only suggesting - anyway, the fuel lines feed are hard plastic and if they are whitish hue they are probably new, old ones become mud colored.

for nozzles, Bosio Fratelli are regarded as high as the OE German Bosch nozzles that came with the car, I dont think that ive come across Monark SD310 nozzles.

Whatever you buy stay away from Made in India Bosch nozzles, their quality is really bad - so bad that your old nozzles would be better.

OTOH I am supposed to get a set of 5 bosio nozzles from a freind in UK, I will have to buy one from here and like said above - the shims for the KCE injector body are smaller than the KCA body which makes it a bit of a pricey game unless you are cool with it.

btw Im assuming your car is out of commission at the moment, use this as a reason to down the fuel tank and at at least clean the pickup strainer - my car has become a long legged highway runner after that - it really gets going once i boot it on the highway - the amount of grunge that piles up on that little strainer is shocking

Diesel911 · #12 03-04-2013, 11:37 PM

Quote:

Originally Posted by Dalakian

You're saying that new nozzles will run me around $250?! I thought that I could buy a set of rebuilt injectors from mercedes source for around $350 all-together, without core charges?

Sounds incredibly expensive... I will do some more research but last time I've checked the nozzles were not nearly as expensive as you're saying. Hmm...

Does anyone have good experience with running Diesel Purge through their system and seeing any noticeable results? I'm not ready to dump another $300 into the injectors alone.

You might ask that Guy what Nozzles He bought. I think the Basio Nozzles are close to $49 each.