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Like anything in restoration it is in the preparation that the final results will be either great or poor. It takes up huge amounts of time, but when done right , it ends well.
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I would also be looking strongly for corrosion of the aluminum. As those cases look fairly well beaten up buy the elements. Having worked with aluminum on seaplanes and repairs of them its often that the separation / corrosion is not visible or slightly visible from the surface. As good clean as proposed would give an indication of damage if any.I seriously doubt they will simply vapor blast the cases without them being bead blasted first. The vapor blasting simply does not have the strength to remove difficult stains or similar whereas the bead blasting will. In any case I strongly suggest you remove the pump sleeve, you will find it extremely difficult to successfully mask off the timing side area enough to stop grit (either from beads or the vapor blasting medium) getting in behind the upper cavity beyond the pump sleeve. I'd hate for you to make an expensive mistake..........
I know I'm a little different, but in some situations, I have used that dishwasher detergent reaction. This head was blasted in the distant past, but still (to me) had a really harsh looking bright blasted surface. A run through the dishwasher gave it a more natural aged look. The photo and the lighting make it look a little different, but again to me, it looked a lot less out of place.Here's an example of a nut rusted rocker cover from a BSA. I was cleaned in a industrial washer with an aluminum cleaning detergent that won't react to aluminum like some dishwasher detergents do. It was then soaked in a derusting solution like evaporust for 6 hours then rinsed. I doesn't have the issues of some acids making a raw fast rusting steel. It won't attack most paints if used for moderate times. Good for sympathetic reconditioning. If you look close you will notice the natural shine that the casting had between the corrosion.
I know some have used molasses for animal feed to get the same results forI found out today why Monster energy sponsors motorcycle events
put a can of that in a ultrasonic bath and see how clean the alloy part gets....
not a lot of good for crankcases especially with the Big Nannys sugar tax
They have been stripped to absolutely bare alloy castings including oilway blanking screws removed etc and the first degrease done. I have tried several alloy cleaners and they are not having any effect so I have decided its dry blast in my blasting cabinet to remove the corrosion and then get a local company to vapour blast to get a decent sealed finish. I'm taking photos at each stage and will post them here, but it may be a week or two as I have other things on the go as well such as get the blasting cabinet working properly as there appears to be a blockage somewhere.How's the case cleaning going Simon?