Quote:
Originally Posted by Biodiesel300TD
Which picture are you talking about? What is the hole for? Seems odd that some manufacturers would do it and other wouldn't. I know veg oil is hard on injectors, the original injectors has nearly 300k miles and about 40k of those were veg oil miles before they started nailing. The new ones started nailing after about 15k miles, I don't think I can blame all the nailing on veg oil.
Seems like valve stems seals should be done just cause the engine has 320k miles and they are cheap, and it sounds pretty easy to swap them.
I use the partially synthetic Delo oil, and it's been a few thousand miles since I removed the system, seems like the rings shouldn't be stuck but when I pull and check the injectors I'll drop some MMO in just for good measure.
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The part of the pic with the whole Injector has a little circle at the bottom marked #12. To the rignt is a larger Circle parked #12 that has a magnified pic of what is in the little #$12 Circle.
Those little passages are actually drilled into the Tip of the Injector Nozzle Pintle.
I copied this from the FSM:
"The Injection Nozzles with the Bosch designation DNO SD 240 is a perforated Pintle Nozzle.
It differs from Pintle Nozzles by a crosswise bore and a longitudinal bore #14 and #15). In addition, a Maintenance-free Rod-type Filter (13) is pressed into the Injection Nozzle Holder top.
The advantage of the perforated Pintle Nozzle is
better injection at lower volume and less load, as well as a reduction of coking on the ring gap."
I read somewhere that Bosch had a Patent on the drilled passages. Also in the FSM the is mention of DNO SD 240/ with the / indicating that the central passages was enlarge. This makes me think that Bosch found out that the narrower passage of the DNO SD 240 carboned up more easily.
I think that if Periodic Diesel Purges are done and the Valves are kept adjusted that it is possible to keep the passages clear of Carbon. But, on my Engine and most of the Injectors I have pulled from the Junk Yard those passages were entirely plugged solid with Carbon.
After that happens I do not think a diesel Purge will work on it.
In any event the later Bosch Nozzles have a Facet (flattened area) on the Pintle that serves the same purpose as the drilled Passages. Monark Nozzles for the 617s also make use of the Facets.
As far as I know Bosil Nozzles do not have either the Facet or the drilled passages.
So I believe the Monark and the Bosio Nozzles are constructed in a manner that they are less likely to carbon up.