This topic of "Injector Face Coking" and how to remove it was started on a thread about something else so it was suggested we start a new thread.
Hi Bork, No not at all. Diesels love running up there. I stick or brick on the pedal therapy with additives in the fuel additives for hours, not a problem at all.its good to let diesels run for periods of time at different rpms.......
Speaking of which, babying and not letting them live at sustained high rpms and without the proper additive that can dissolve carbon, is the number one cause of injector nozzle coking which in turn effects the spray pattern interfering one with the diameter of the spray patter, then builds encroaching enough into pattern it then interferes with all fuel being atomized. As it bit or side further encroaches into the pattern and now 50percent so so hit the coking no longer atomized and you dilute your oil wearing things prematurely at the same time, you burn a hole in your piston and unless you are looking in the mirror and seeing smoke or have your EGT gauge probe in the manifold on the bank where this is happening. Before it manifests itself in that extreme form, it will show up as a slow loss of power over time but as little as 6HOURS of running in some tests. Slow decrease in fuel economy.
Some partially logically believe is 20k-30k psi should be enough blasting to keep that from happening. Partially correct to a degree but as the does hit it those two factors are happening; spray pattern narrowing and atomized fuel contact with it that becomes unatomized raw fuel before being burnt. You need an additive that dissolves that encroaching edge of the coking line back far enough to prevent the fuel to Coke contact.
Injector face coking is a subject that should get way more attention on the TDS.
We kinda fall into chasing down common I'm broken down problems and I feel overlook items like this that rob us slowly overtime so it's not a felt dramatic change until you are driving tank after tank going, hmmmm?
Lots of lab testing on this by manufacturers.
We can start a whole new thread on subject and we can dig up different engine manufacturer's own testing on the condition. That will be cool. I'm not the guy for linking to here to post but some of you guys are experts on that.
Start with searching using search words and then the engine manufacturer. All have done long running test for high hours and you can see power dropping off. They pull injectors and you can see the build up on tip and with magnification you can see the build up have its leading edge encroaching on the offices. They run different types of fuel system additives and run for continuous hours and monitor power drop off from where they left off. Use the correct additive the spray will continue to contact that leading edge but it starts dissolving back that leading edge that was encroaching on office. Use a general cleaner it might just clean up the fuel system from tank to just prior to the injector tip. Get a biocide and you will just kill;algae, yeast , organic funk and do nothing else but that just kill the stuff which in turn clogs up your filter, so you then need a cleaner. Have injectors with that coking encroaching those things will do nothing. Get the right cleaner that contains a decarbonizer you can disobey back that leading edge.
Picture a plant mist sprayer. Your nozzle is going thru a hole in card board covering a paper towel tube size acrylic cylinder. You spay and can see a spray mist pattern going in. Now your acrylic cylinder has a slot in it tight below that cover plate with hole you inserted the plant mister nozzle into, to spray into cylinder. Now you have a thin card that fits perfectly in that slot in the cylinder. It has a hole in the center of it for your spray to pass thru into acrylic cylinder. It's hole is just slightly smaller than the hole up top you are spraying into. Now spray. You see the pattern start but hits the edge of that smaller hole in the card with slightly smaller office size and you will see mist hitting it and instantly turning to water on the outer circumference of the patter while core of pattern can be seen as passing thru in a mist state. Gotta get that edge melting back. I'm a firm believer of getting them professionally cleaned and tested. What you gain over time just in fuel, let alone missing out on power or in bad causes the real bad ugly damaging effects, pays for itself.
You end up properly maintaing your truck and getting the benefits. You as a pro move on while out being done. They come back in you know they are clean, tested and ready to send out with confidence you have gone the extra mile in assuring quality work and maintaing and growing a business relationship.
You can move this I won't be typing this much on the subject twice. Won't let me do smily face emoji.
Not sure I follow. How many different ways could they clean it off?Good video. Though I would really like to see an analysis of the common deposits on injectors and see exactly HOW the additives clean it off.
Blue, I have seen that certain types of Biodiesel are prone to leaving coke deposits during the combustion process. Its kind of counter/intuitive since Bio is reputed for its solvent or natural detergent qualities.The oil side of the injector wears out much faster than the fuel side.
Good oil and filtration for the oil is more important.
But running liquimoly every 6 months can't hurt either to keep the fuel side clean.
Biodiesel is the worst culprit. It can leave lots of deposits.