Hello list. Injector update: I found that the injectors past the dribble test but were popping off at (2 @1300, 2 @1350 lbs.) and the spray patterns were not good. I tested them using the blend that I have been using to get a view of what the engine is seeing with the blend. I have the nozzles soaking in sodium hydroxide (oven cleaner) and they seam to be cleaning up nicely. What "appears" to be coming out of the nozzles is gelled veggie oil as it looks like the same as samples of veggie oil that I left out to (air dry) for several weeks. More to come as I get them clean and set the pop off at 1493 lbs. and see if the correct pattern of spray returns.

Side bar: When I purchased this truck the owner said he had the injectors tested a few thousand miles ago. So I called the mechanic that did the test. " Yea, I tested them, the only way to test them is to crack the injector line when running and if the motor dies down some they are just fine." uuuuuummmm MY mistake for not testing before starting my test of veggie oil and WMO.

So far the only info I can find about the nozzle profile used in the N/A engine is the following:

numbers on nozzle: DNOSD 193
Bosch type number. DN12SD12T

not sure about this decoding?????
Ex. DN0SD273
D= Nozzle
N= Pintle nozzle; L= hole type; S= hole type seat nozzle (additional: L= long nozzle collar; without initial= short collar) (A/B/Z/without initial= details about fixing of the inlet)
0= spray cone angle
S= 17mm collar diameter; P = 14mm, R = 16mm, S = 17mm, T = 22mm, U = 30mm, V = 42mm, W = 50mm
D= standard nozzle/ P= experimental type

D = Nozzle (or Deuchland for Bosch?)

[BD]L = Short stem nozzle (Hole type)

[BD]LL = Long stem nozzle (Hole type)

[BD]N = Pintle Nozzle

[BDN]0 = Spray cone Angle

[BDN0]S = 6 mm nozzle needle diameter

[BDN0S]D = Delay type nozzle (with obturator)

[BDN0S]273 = Unique Identifier (special features)
These include pintle profile (converging/diverging), flow lift curve details, anti-coking flats etc. This number simply increments as a new design requirement is requested.

I called a local diesel injector rebuilder/parts supplier and found that the DNOSD 193 nozzle has not been superceded and is available at $15.74. I have two thoughts concerning the fact that this nozzle has not been superceded over a 20+ year time. One of the best cost savings for a manufacturer is cut the SKU's (stock keeping units) by using one number to replace two or more numbers. So, does this nozzle have a unique pintle profile or perhaps is it also used in a high volume application such as in industrial engines, maybe the C240.......any thoughts???

crossbones