I know this is an old thread, but could anyone answer this question?? I am in the same process and unsure if I would be capable of reassembling the crankcase after cleaning it out by hand.What is the best way to clean/flush aluminum particles from the crankcase without removing the engine and splitting the cases. I'm in the process of replacing #1 piston and rings now, so the #1 jug is off. I noticed a little bit of aluminum dust inside the case and was wondering if I could flush it with something and then pump it out.
And it worked? the crank didn't go later on? I'm just afraid i'm gonna have to pull the engine apart again because i didn't do something right. I'm paranoid lol.I just got a gallon of diesel and poured it in the crankcase and syphoned it out with a hand syphon pump. I repeated this process several times until I couldnt see anymore aluminum pieces.
I don't think hardly any material actually got into the bearings.. My piston toast, yes, but it's not nearly as bad as pictures of some others ive seen on here where the oil line fell off. The crank looks mostly clean of debris but there are a few miniscule metal flakes around the rim of the crankcase under the piston. I think I'm just going to flush it out with some yamalube and gasoline mix repeatedly.Really depends on how much material got into the bearings and how long the cylinder may have been ran without oil if the oil line fell off. Really no rhyme or reason as too many variables come in to play. Be save than sorry, but when budget comes into play, that is another story.
I once used brake parts cleaner and shot it in the oil feeds to the bearings. You will need some pressure to seperate the trash. Got out the really small fragments and used some shop wipes together with rotating the crank to wipe it all out. Could also remove engine.
The roller bearing on the rod/crank is crucial. If any notchy feeling in there, time to swap. Can go and take the cases with it.
