Unblocking injectors?
#1
Thread Starter
Unblocking injectors?
Have got a GBooster 160 that has had its injectors block up only 5 starts after it came back from a service at EvoJet. Definitely blocked as the initial flame is poor and compressed air does not flow though the fuel port. Wanted to know if there is anything I could flush through the port into the injectors to clear what I am told is probably carbon build up? Any help appreciated. I'm loathed to send it to IQHammer unless I need really need to. EvoJet won't return my emails. Got me labelled as a difficult customer I guess. Go figure.
#2
Join Date: Sep 2007
Location: Beeton, Ontario, CANADA
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Well im no expert.. but i did do the same thing on a RAM 750 a couple of years ago. I submerged the ring in Acetone for an hour and then swished it around. Then blew it out with low air pressure. I then hooked up a propane bottle to it and with very low!! pressure lit all the wicks to check for consistency. They all burned perfectly even so I re installed it.
Cheers
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#7
Join Date: Jul 2006
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Dominc
You will have to strip the engine down completely.
This is not that straightforward with the G booster, as I found out, has several soldered joints that have to be unsoldered to get the thing apart. (there is an internal thermocouple and the internal Kero plug.) Even the front cover is not straightforward to remove and you will need to take many photos to make sure you reassemble it all in the same way. If I was you I would not attempt it but try and find someone who has doe a strip down on a Booster before and persuade them to do it. The engine will definitely need balancing on reassembly. In my view this engine was not designed to be easily serviced.
The injector needles are fixed to the rear of the diffuser like the Jetcat engines.
If you attempt to do this then you need to start at the front end.
John
You will have to strip the engine down completely.
This is not that straightforward with the G booster, as I found out, has several soldered joints that have to be unsoldered to get the thing apart. (there is an internal thermocouple and the internal Kero plug.) Even the front cover is not straightforward to remove and you will need to take many photos to make sure you reassemble it all in the same way. If I was you I would not attempt it but try and find someone who has doe a strip down on a Booster before and persuade them to do it. The engine will definitely need balancing on reassembly. In my view this engine was not designed to be easily serviced.
The injector needles are fixed to the rear of the diffuser like the Jetcat engines.
If you attempt to do this then you need to start at the front end.
John
#9
Join Date: Nov 2003
Location: Curitiba, Parana, BRAZIL
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Here in Brazil, some years ago we didnīt have local servicing..and sending back the turbine for repairs to the usa was a adventure.
At that time we had a brand new airplane here in wich my then inexperienced friend forgot to install the fuel filter and his Jetcat P120 ended up clogged.
After some considerations we decided to use a syringe with a 4mm tube installed in the turbine fuel intake to remove all the fuel it had inside. Then we saw dirt particles with the fuel inside the syringe and the problem was solved, without even taking out the engine off the plane..
I think it is worth to give this a try.
At that time we had a brand new airplane here in wich my then inexperienced friend forgot to install the fuel filter and his Jetcat P120 ended up clogged.
After some considerations we decided to use a syringe with a 4mm tube installed in the turbine fuel intake to remove all the fuel it had inside. Then we saw dirt particles with the fuel inside the syringe and the problem was solved, without even taking out the engine off the plane..
I think it is worth to give this a try.
Last edited by erbroens; 09-20-2014 at 04:42 AM.
#10
Join Date: Feb 2013
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Go online and look up Carbon-X. Buy a gallon of it, pour it in a plastic container and soak the bottom half of the turbine in it for 15-20 minutes. Blow compressed air through the fuel port and it should clear it out. You can also use automotive brake cleaner to try and clear the injectors. If you use brake cleaner, make sure you leave the turbine out and pump your fuel through it to re lubricate the bearings as the brake cleaner will strip all the fuel and oil out of the turbine. The internals are Inconel or stainless and the brake cleaner won't hurt anything inside but give it a good cleaning. Hope that helps..
#11
Go online and look up Carbon-X. Buy a gallon of it, pour it in a plastic container and soak the bottom half of the turbine in it for 15-20 minutes. Blow compressed air through the fuel port and it should clear it out. You can also use automotive brake cleaner to try and clear the injectors. If you use brake cleaner, make sure you leave the turbine out and pump your fuel through it to re lubricate the bearings as the brake cleaner will strip all the fuel and oil out of the turbine. The internals are Inconel or stainless and the brake cleaner won't hurt anything inside but give it a good cleaning. Hope that helps..
I have never pulled a turbine apart but I'm mechanically minded and this idea could make things wears. The fuel ports from a turbine are very small from what I read and have seen from a gentleman who was from Western Australia who was kind to pull one apart and run things thorough with me. If you have dirt stuck inside pressurised air could push the dirt in further making it even harder to remove. Air pressure could potentially also damage the fuel port. If I where you I would send this in to an authorised professional to do however if I just could not afford to do this or it was not practical I first would try the syringe idea and if this would not work I would pull it all apart insert the fuel ring in clean Jet fuel and on very low pressure if possible to do would blow air from the outlet back through.
Again I stress that the best option is to take it to a professional.
Ivan
#12
Join Date: Feb 2013
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Ivan,
Carbon -X is used by all the full scale jet engine repair facilities and works fantastic. I have a friend that work in the scale turbine industry and he is the guy that turned me onto it. It virtually dissolves all carbon and grime deposits and I'm sure it will clear the clogged injectors in his turbine. How is air pressure going to damage the fuel injectors, they are made out of stainless steel or Inconel and designed to be under pressure. Automotive Brake cleaner is design to break up and dissolve any dirt or grime deposits on contact. If I was a gambling man, I would guess his injectors are only clogged with fuel sediment and the brake cleaner will do the job by itself. I am interested to know what turbine you saw get taken apart? If it is so weak and fragile that some compressed air can ruin it, I want to make sure not to buy that turbine!!
Also, what you are suggesting to use a syringe to try and clean the injectors will require a complete tear down of the turbine and that means it will need to be re balanced when assembled. Dominick was trying to clean it without sending it back to EVO after they failed to fix it the first time. My suggestion WILL work and save him the agony of sending it back again.
Ghostrider 1 out!!
Carbon -X is used by all the full scale jet engine repair facilities and works fantastic. I have a friend that work in the scale turbine industry and he is the guy that turned me onto it. It virtually dissolves all carbon and grime deposits and I'm sure it will clear the clogged injectors in his turbine. How is air pressure going to damage the fuel injectors, they are made out of stainless steel or Inconel and designed to be under pressure. Automotive Brake cleaner is design to break up and dissolve any dirt or grime deposits on contact. If I was a gambling man, I would guess his injectors are only clogged with fuel sediment and the brake cleaner will do the job by itself. I am interested to know what turbine you saw get taken apart? If it is so weak and fragile that some compressed air can ruin it, I want to make sure not to buy that turbine!!
Also, what you are suggesting to use a syringe to try and clean the injectors will require a complete tear down of the turbine and that means it will need to be re balanced when assembled. Dominick was trying to clean it without sending it back to EVO after they failed to fix it the first time. My suggestion WILL work and save him the agony of sending it back again.
Ghostrider 1 out!!
#14
Mechanical cleaning is probably the only way.
But if trying to dissolve the dirt I would soak the engine in the preferred cleaner and then use a fuel pump with filter to suck through the fuel port. It's pretty obvious if you got something in that stuck half way through it will be the only way to pull it out, not push it further in(!)
You need to remove some electronics first and as John stated it might be a difficult task on some engines.
But if trying to dissolve the dirt I would soak the engine in the preferred cleaner and then use a fuel pump with filter to suck through the fuel port. It's pretty obvious if you got something in that stuck half way through it will be the only way to pull it out, not push it further in(!)
You need to remove some electronics first and as John stated it might be a difficult task on some engines.