M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: irish44j on November 15, 2013, 07:32:27 PM
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Disassembled the TB completely to do a refresh. Looking at the little screws on the butterflies (that hold them to the shafts), they almost look to be mildly mushroomed at the base of the thread (essentially, a lock-screw). When removing, looks as if the last thread on the screw pretty much just shaved itself out (these things are TIGHT).
I don't see those screws shown anywhere on RealOEM or elsewhere as a standalone part. Any advice on putting them back in/replacing them? At this point it looks like I'll just chamfer the edge a bit and use some red loctite, but would obviously like to "do it like the factory" if possible.
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I think uour best bet is to reuse the screws and use loctite. They aren't intended to be disassembled from the factory point of view.
A lot of times its a really fine thread pitch too so no normal fasteners work as replacement!
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They're staked to prevent them falling down the intake. I'd probably reuse mine with some Loctite red, since they don't get very warm.
I'd suspect you could order them from a supplier like Grainger, but I'm not sure of size. I'd bet they're a common metric size.
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Dave, the BMW ones might be a common size but I know VW and Porsche are not a common size. I assume BMW would be similar.
Your best bet is to reuse the fastenets!
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I could be dead wrong on this account but those screws are installed and staked as they are not a serviced item. Your best bet and (safest) path of least resistance is another complete throttle body. And leave the screws alone on the next one.