After run oil problem for diesels?
08-05-2006 | 03:20 PM
#1
After run oil problem for diesels?
I saw the piece in the engine column of this months Model Aviation and at one point he indicates that !QUOT!after run oil!QUOT! that he had put into the diesel engine before storage caused the engine not to fire. The article indicated that the antioxidant's that prevents rust also prevents diesel fuel from igniting! I recently had my OS 40FP DDD on the bench to do some testing, I mixed up some starter fluid blend and could not get it to do anything except a couple pops, even with a starter (a weak starter, but none the less). I thought it was that I just got some old starter fluid that was low on ether. After reading this I started to wonder. I have used Marvel Air Tool fluid as after run in all my glows, its good stuff.
Has anyone else had a chance to confirmed this? If true, what do we do with the engines that have been treated with ARO?
Has anyone else had a chance to confirmed this? If true, what do we do with the engines that have been treated with ARO?
08-05-2006 | 04:54 PM
#2
Senior Member
RE: After run oil problem for diesels?
I use Rislone and have never had any problem. I cannot immediately picture a chemical mechanism where old after run oil on any kind would prevent diesel ignition, but I am not a chemist.
08-06-2006 | 06:34 AM
#3
My Feedback: (1)
RE: After run oil problem for diesels?
Dear all,
It makes sense that if you flood the cylinder with after run oil, leave it for a while, and then try to start the engine, that you will have problems. In glows my experience has been that ATF (for example) does things to glow plug elements. Diesels are hard to start unless you flush out the whole engine before trying to run it. Even if you are able to get the engine going with the after run in it, then it will have to be burnt off before the engine can run properly. Who knows whats left inside the engine!
I'm now in the habit of flushing all ATF out with kero before attempting to start anything. I've noticed that our local F2A (C/L speed ) flyers flush out their 2.5cc glow engines with kero after each run. It not only cleans out any bits of glowplug element it also seems to keep the races clean. Apparently if they don't do it speed drops after a few runs.
Kero is cheap and a good (enough) solvent for the oils that we use.
regards Ray
The pics below show my Tiapan 2.5cc Mk 13 diesel, made up of bits from three different engines. This engine will only ever be run on 25% castor, 33% ether (pure di-ethyl ether) 40.5% kero and about 1.5% IPN or DII.
It makes sense that if you flood the cylinder with after run oil, leave it for a while, and then try to start the engine, that you will have problems. In glows my experience has been that ATF (for example) does things to glow plug elements. Diesels are hard to start unless you flush out the whole engine before trying to run it. Even if you are able to get the engine going with the after run in it, then it will have to be burnt off before the engine can run properly. Who knows whats left inside the engine!
I'm now in the habit of flushing all ATF out with kero before attempting to start anything. I've noticed that our local F2A (C/L speed ) flyers flush out their 2.5cc glow engines with kero after each run. It not only cleans out any bits of glowplug element it also seems to keep the races clean. Apparently if they don't do it speed drops after a few runs.
Kero is cheap and a good (enough) solvent for the oils that we use.
regards Ray
The pics below show my Tiapan 2.5cc Mk 13 diesel, made up of bits from three different engines. This engine will only ever be run on 25% castor, 33% ether (pure di-ethyl ether) 40.5% kero and about 1.5% IPN or DII.
