A little something about Nozzles

[Smokey Eddy]

Fiddling about with my old nozzles while i was browsing the forum i noticed something possibly worth mentioning.

All four nozzles are DN 0 SD273 which are the stock nozzles yes?

Three of them have the numbers 742 (955) on them and one has 949 (955) on it.

The odd ball, 949, is very difficult to pull apart (the center part); and the other three slide freely.  I can shake the 742's violently and they don't come apart but the black sheep, 949, is very stuck in there in comparison. I assume this is the cause of a "sticky" injector I had.

I found it curious that the one that was sticky has a different set of numbers on it. Why is this nozzle different? It is obviously a replacement.

Anyways, perhaps it's an idea to avoid nozzles with 949 on them or i may have had bad injector housing and it broke two nozzles? I dunno.

Edit: haha immediately after posting i tried swaping the plungers around from a smooth nozzle with the stuck one and in and out a couple times, switched them back and now they are both smooth.
Must have been just dirty?

On the topic of nozzles. Has anyone ever enlarged nozzle size on a set of stock nozzles? I guess you would need a very precise milling machine.

[dillenger1]

On the topic of nozzles. Has anyone ever enlarged nozzle size on a set of stock nozzles? I guess you would need a very precise milling machine.


I know that on the bigger,newer di engines(cummins) they will use a fancy type of plasma cutter almost to open up and smooth the nozzle hole.They insert a wire into the hole and zap it with current,opening it up and smoothing the walls for better flow.very small very precise.