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      02-29-2012, 08:00 PM   #15
Private First Class

Drives: 2008 135i
Join Date: Jan 2011
Location: NC, USA

iTrader: (1)

The best way to clean the valves is with a walnut blaster. Sand blasting would get sand where it shouldn't be. I just used a gun barrel cleaning brass brush, a shop vac, some dental pics, lots of carb cleaner and one hour per set of valves to clean all the crud. It makes a big difference if you have a lot of buildup. Just make sure the valves are closed then fill up the chamber with carb cleaner and wait a bit before you go to town with the brush. It takes lots of patients and working at odd angles.

Nice writeup BTW