Very interesting take on "rebuilt" injectors.. - PeachParts Mercedes-Benz Forum

dkveuro · #1 10-23-2006, 03:43 AM

Quote:

Originally Posted by kip Foss

.............................................. And I'm a pretty nice guy ............ And modest too.

Yeah...those qualities really shine through, don't they ?

Anyone who is presenting themselves as an authority, as indeed he is, needs to have someone else do the write up if they are admittedly sort on the English....to maintain the standards that they are trying to sell.

It has to be said, that he is trying very hard to put over his product as superior...no ?

Whether or not you can write eloquently or not is never a reflection on the quality or effort you put into manual work unless you are trying to sell your work on quality, as he is.

.

Shorebilly · #2 10-23-2006, 08:10 AM

G'mornin' Guys,

I read and re-read the ad for those injectors.....in my humble opinion, there is a bunch of both good and bad info in that fella's writeup of his injectors.

Personally, I am a USCG Lisenced Marine Chief Engineer, Steam and Motor, Unlimited Horsepower.....but I have been retired for the past 10 years. A couple of years after my retirement, I took a job at a Fuel Injection, Test and Calibration Shop ( I was getting bored). This particular shop also rebuilt Turbochargers....therefore I have seen and operated all of the various testing equipment that that particular shop had. To include digital fuel injector popping equipment, and digital high speed balancers for the turbos.

I have never heard of the "sweet spot" that the injector's seller discusses. However I have lapped fuel injector nozzles and pintles with talcum powder, yup, talcum powder.....was also taught never ever to touch needles and guides, pintles, delivery valves, and plunger/barrel sets with my fingers, unless my fingers had a good coating of diesel fuel...as the oils in one's skin can actually etch the highly machined surfaces......was also taught never to put any of the mating surfaces, metal to metal fit, together with any form of oil, dry only, because even a molecule of oil will eventually cause a leak.....please note I am referring to non moving metal to metal surfaces that seal the injector or the injection pump.

As, I am a do-it-yourselfer, these days...and I have no popping bench, calibration equipment, special tools, and a very clean area in which to work. as well as easy access to special parts and shims. If / when I feel the need to overhaul my injectors or injection pump.....I will take it/them to a reputable "Injection Shop" for testing and necessary repairs/replacement of parts.

The buzz that the seller speaks of...is a true fact...however, I do not know if it applies to these specific injectors...one needs to look this data up on a computer with a Bosch CD ROM, or if they are before a certain year of manufacture....on an old fashioned micro-fiche....the pop, buzz is important.

The leakdown, is also important.....although it tends to manifest itself as a dribbling injection nozzle....and I suppose in theory, it could present itself as an out of calibration Injection Pump....but any leakage in pressure that would cause that, would probably be noticed as fuel running down the injection lines and engine.....leaving a nice fuel puddle under the car.

As far as applications go....I am not a MB expert....however, if a manufacturer of any German equipment puts a part number on an item, it will be the same part number across their entire equipment/automotive line. BUT, bear in mind, when dealing with Fuel Injector Nozzles.....you need to check the "Fuel Injector Assembly" part number......there may be cases where the injector body will have the same part number for different applications, but the injector nozzles will have different part numbers.....therefore the "assembly" will have a different part number.....

Fuel Injectors and Injection Pumps are assemblies of very specific parts, most of which are machined to very close tolerances....one could spend weeks in classes at the University level, just learning about what and why it works.....I personally would leave it to those who do injectors for a living!!! If a shop has a Bosch certification.....it will be good enough for my injectors.

If/when I need to do some work in this area, I will ask a couple of MB dealerships where they send their stuff for rebuild.....also will ask the local tractor and/or heavy equipment dealerships, where they send their injectors....a good Kenworth, Peterbuilt dealership would also be a good place to ask.......Caterpillar, if the shop that they use, is also Bosch Certified, but Caterpillar injection equipment bears little resemblance to Bosch stuff......

Enuff Said,
SB

Please don't correct my grammar or punctuation.....I never got a degree in any of the Arts or Humanities......and I am not typing a letter that is trying to convince my boss that I need a couple of hundred grand in injection repairs.....