Bosch Injector Cleaning Kit: Instructions?

[JEBalles]

I got this Bosch Injector Nozzle Cleaning Kit in a bundle of parts I bought. I also got four injectors to practice on, but I just can't really figure out what to do. Anyone got experience with this?

[tangofox007]

Can you describe what's in the kit or post a picture?

[JEBalles]

It's a brass? brush, handle with fine metal string attachments, and tapered scrapers.

[tangofox007]

That looks like a kit for cleaning the nozzle only. The fine wires and pin vise are for the nozzle aperture and small holes in the end of the needle valve. The scrapers are for the needle valve seat in the nozzle. If the tool with the aluminum handle has an L-shaped scraper on the end, it is for the chamber around the needle valve seat. It can also be used for the nozzle seat in the nozzle holder. The brass brush is for exterior nozzle cleaning and can also be used on the nozzle holder. In addition to what is in the kit, a couple of tube brushes would be needed for the interior of the nozzle holder and insert.

[Diesel911]

There is a description on how to use the kit in the Factory Service Manual CD set. (Merced*s Sourc* has copycatted part of the kit; they might have instructions at their site.)

The Wire and Pin vice are indeed used on Mercedes to clean #14 and #15 in the picture of the Injector Below.

Some of the other stuff is various sized scrapers to scrape the Seat in the Nozzle.
I have not used the Bosch Kit before but Stanadyne had a kit (around 1973) for their Pencile type Injectors that had similar scrapers.
What I/we found out where I worked was that the scraper saved very few Injectors. And, for use was not worth the labor.

The reason the scraper did not work better is that the Pintel hammers the seating area in the nozzle and itself; bits of Carbon get beat into the metal and the high pressure of the Fuel erodes the surface of the seat.

The damage to the seat cannot be scraped out.

In order to use the Pin Vice and Wire effectively the Wire must be smaller than the hole (the manual tells you what size to use).
Not in the manual. Where I used to work we would grind a Hypodermic type point on the Wire and carefully drill into the Carbon Plugged tips. A flat ended wire is not very effective.
This might not happen to a Mercedes Injector Nozzle as the holes are big in it but on the Direct Injection Nozzles when the were picked out with a Wire sometimes the Wire would break off and also sometimes that wire was not coming out either.

[JEBalles]

It sounds like I need the injector tip out for this. Ima try that before I can understand all this fancy lingo.

[Diesel911]

Originally Posted by JEBalles

It sounds like I need the injector tip out for this. Ima try that before I can understand all this fancy lingo.

Evidently I forgot to put the picture there. It is there now.