The biggest and most high-tech washing machine at mtu is in Plant 2 in Friedrichshafen and is used to clean crankcases. The process is rather like a car wash. Before the crankcase is conveyed into the washing machine, it is pre-rinsed. Just as in some car washes you have to clean the wheels by hand first, so it is with the clean-oil bores in the crankshaft, which have to be flushed. Then a production technician secures the crankcase onto a fixture and off it goes into the washing machine. The door opens, the crankcase goes inside and the door closes. This is when it really gets exciting, although from the outside you can only see through four small bullseye windows what is happening.
Crankcase completely submerged
“Inside the washing machine is what looks like a gym wheel which rotates the crankcase so that it can be cleaned and dried better,” he explains. Then the washing chamber is flooded with 7,000 l of water and the crankcase completely submerged. The water, which is heated to 70°, is swirled through the holes in the crankcase using high-pressure pumps. After nine minutes, the water is drained off along with all the coarse dirt particles, and the rinsing water is pumped into the washing chamber. Once again, the highpressure pumps rinse out the crankcase.