Quote:
Originally Posted by lee4him
***As you do this, be careful, the walnut shells will burn through plastic. So when cleaning the top ports, make sure you have your wands in the head far enough. you don't want to allow the media to clean the plastic valve cover.
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Can't emphasize this enough:
Avoid pulling out the wands beyond the markings on the wands for the top port. The media will eat away the plastic of the valve cover very fast. This is how it looks like when you don't pay attention for a second.:
The picture doesn't really show the extend of damage, but the groove is at least a millimeter deep.
I believe this is the reason why BMW changed the cleaning proceedure to removing the valve cover in the new SIB 11 03 14. However, I think the additional work is not worth it.