"DO NOT OPEN" bolts on valve cover

ForestHillsJackie · 02-03-2026, 10:38 PM

There are these two bolts that on the valve cover that hold the piece that receives the valvetrinic. They are marked “DO NOT OPEN”, and I would not mess with them, except they are loose. Can I tighten them? What are these called and what are they for?

ryan stewart · 02-04-2026, 07:42 AM

My assumption would be that is a warning not to mess up alignment/calibration since the position of the valvetronic is so important.

02-03-2026, 10:38 PM	#1
ForestHillsJackie Private 146 Rep 113 Posts Drives: 2007 BMW 328i Join Date: Oct 2023 Location: Queens, NY iTrader: (0)	"DO NOT OPEN" bolts on valve cover There are these two bolts that on the valve cover that hold the piece that receives the valvetrinic. They are marked “DO NOT OPEN”, and I would not mess with them, except they are loose. Can I tighten them? What are these called and what are they for? Attached Images
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02-04-2026, 07:42 AM	#2
ryan stewart Major 2321 Rep 1,414 Posts Drives: 2008 328it Join Date: Aug 2012 Location: Atlanta, GA iTrader: (0)	My assumption would be that is a warning not to mess up alignment/calibration since the position of the valvetronic is so important.
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