Yeah WVO will probably destroy any nozzle over time....they are not meant for that. Nor is the engine itself....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

When you get your rebuilds you send them your old injectors as cores. They reuse your "old guts" (except for a new nozzle) to make another set of rebuilds for the next customer. I other words when you by rebuilds except for the nozzle you are getting someone elses "guts".
The nozzle is the only part that really wears out.
I worked in fuel injection shop for 5 years. I have see 3 of the pressure springs break. Occasionaly the injector Nut cracks or gets eaten away when combustion gases get up there and ounce in awhile rust or erosion by the high pressure of the fuel eats through the interior sealing areas so badly that they cannot be lapped out. Those parts would be replaced.
Other than this there is no reason not to buy rebuilds.
Some sites sell Completely new Monark injectors (for a 84 300D) for around $80 each and should be replaced as a set. If you can find new Bosch injectors they are $125 each or more.

There is a thread somewhere about I believe it was 3 stages of combustion that the fuel goes through as it is injected; you might want to do a search on that. When and how much of the fuel is being burned at its various stages alters the noise it makes.
Again some of the threads of persons who have used Monarks nozzles say that they have quieter Idle. I have never tried them yet. I have cheap Itailan nozzles made by 7 Diesel in my car.

My question is, How do you tell 1 Bosch injector from another.
I have a set here, but from what I understand, the ones from India are not as good as those from Germany......How do I tell where these were made?

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

Well maybe. They all have the same part # but there is 2 different #'s stamped above that......2 have something like 384 and the other 3 have 484......go figure

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

how well do they work?


My 300d needs new nozzles

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-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)

Thanks! I just Emailed them. I knew a place that had them at $19.73 each but 2 months after I found them they were bought out by some one and never opened under the same name again. The new owners never answered 3 of my Emails.

There is no way to tell where the Bosch spray nozzle was made by looking at the body of the injector. You would have to unscrew the injector nut and take a look.
If your car was made in 84 like mine and you knew it had the origional injectors in it those injectors were made befor Indian made injectors came into the picture.

The number to be most concerned about is how many "bars" are marked on the body. They should all have the same pressure in bars stamped on them (and hopefully set at that pressure). After that as long as they fit it dose not matter.
If you pulled the injectors off of my car and looked at the numbers on the body you would be shocked. I built up a set of injectors for my 84 300d using VW rabbit injector bodys. I set the injector pressure to the proper pressure for my vehicle but the bodys are stamped with the bar reading for the VW rabbit.
I noticed that the Bosch rebuilt injectors have a plactic band with the rebuilt injector # on it. This plastic band covers up all the stamped letters and numbers on the injector body. I believe that they do this so the can grab any injector body regardless of the bar reading stamped on it and build it into what ever injector they want it to be leaving only the # on the plactic band for the customer to see.

The nozzles and springs are the moving parts inside the injector. The thrust pin, spacer disk, shim and upper/lower halves don't really wear out. TRUE you can have a spring go bad or break but the part that wears out by design is the nozzle (body and needle.) Some people DO replace springs but the FSM doesn't list it as routine maintenance. It's covered in 07.1-6712 if you have the CD.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

It still sounds like a diesel but it's smoother and more efficient. What you get when replacing worn out injectors = wide, stringy fuel jet, opening too soon even when the static timing is correct, inconsistent fuel delivery even when the IP is metering properly versus concise, controlled fuel jet delivered with good atomization consistently opening at the correct pressure for the correct duration. It adds up to the engine getting fuel the way it should. I need less throttle pedal to accelerate, it went from light smoke on start up to none at all and starting is just a tad quicker. To answer - Yes it runs much better but if your injectors test out OK I'm not sure you will see as big an improvement.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

Actually I'm apologizing for the other guy...the new company will be me on Jan 1. Monark is good manufacturer but I learned why US importers don't want to deal with them. Eu.1500.00 ($2250.00) minimum per order and they want suppliers to stock electrical parts, too. BUT... nothing ventured, nothing gained, right?

I'm waiting to see what they say this week - keep your fingers crossed.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

With those so far poor quality made in India Bosch spray nozzles; Bosch has left the market open for another company from Germany in particular and other Euro countries to come in with a quality product.
If their quality dose not improve people will avoid buying their rebuilt injectors because they cannot tell where the spra nozzle is made.
Bosio has a decent Rep. but for my car the nozzles were $37 each; almost the cost of 2 Monark nozzles and you can get those Bosch rebuilt injectors for $40ish.

If you write to the Monark representative you might want to pass on what I said. Tell him Bosch has left a market open for them. I they would ease up on their rules and let you guys sell some of their product so that you have enough money to think about selling the rest of their line.
Also when I was polking around the internet I saw their electrical stuff also but from the impression I got from what I read the might have some sort of connection with Fram.
Good luck with your business.

I have 5 new injector nozzles that I purchased from DG and never used - car is gone - I will sell for 25.00 each as a complete set (125.00) Thanks!

Very true. There is a market gap BUT Bosch didn't quit altogether, they just moved to older design manufacturing from Germany. Companies other than Bosch have been there all along but not outside Europe (at least to any great extent.)

I think they know their market niche and this was evident two years ago. I went to visit a friend in Stuttgart and he told me about the small specialty businesses there that make "one off" runs of machine parts for many aspects of industry.

I don't know if they are affiliated with Fram but I would not be surprised since so many companies are intertwined in this business.

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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!