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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-03-2015, 05:19 PM   #1
GreatFrog
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Join Date: Oct 2010
Location: College Station, TX
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My Ride: 2005 325i w/ spt pkg
Replace bolts when replacing FCAB?

Is it really necessary? The TIS calls for that, but I never saw people using new bolts in their FCAB DIY threads. The TIS also says replace bolts for reinforcement plate whenever it is removed, again, what is the reason behind that? Replacing all the 12 screws cost at least $33 shipped from huskerparts, and easily over $50 from my dealership. Just don't want to waste money on some unnecessary parts.

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Old 10-03-2015, 08:59 PM   #2
Sansho
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Join Date: Jun 2010
Location: CT
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The bolts are stretch bolts, meant to be torqued for one time use. Someone posted here the exact type of stretch bolt, which can be procured for much less than from BMW. FWIW, I'm one that replaces stretch bolts.
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Old 10-03-2015, 10:52 PM   #3
SilberVogel
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I've always replaced torque-to-yield bolts, as well. More often than not, I also replace the associated hardware with any other repairs since I'm already in there.

Part number for those reinforcement plate bolts is 31106772199 (torque is 59Nm then 9030): https://www.fcpeuro.com/products/bmw...lt-31106772199.

If you're worried about the replacement cost, buy them from FCP Euro. Just like everything else, bolts are covered by their lifetime warranty. I've changed the oil level sensor, oil pan gasket, CSB, etc. all on separate occasions, and FCP has always been happy to warranty those bolts (doesn't hurt that I also buy a lot of other parts from them at the same time).

You asked what the reason was behind replacing torque-to-yield bolts, and here's a video that might be of interest:

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Last edited by SilberVogel; 12-28-2015 at 01:31 PM.
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Old 10-04-2015, 02:28 AM   #4
GreatFrog
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Thanks guys, that's a lot of information. I never thought the angle part is so important. I will just buy the bolts rather than taking chances.
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