02-10-2024, 04:42 PM | #1 |
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1 time use bolts for pulleys?
Been tracking down a noise and thought was one of the pulleys, replaced one and noise was still there, should have just have replaced all pulleys and belt while I was there. Now pretty sure its not a pulley but the belt since spraying a bit of water quites the noise)
So started doing it today, almost all done (not bad job, no space in there but very DIY). When I ordered the parts I did not even think about bolts and the whole single use BMW bolt thing. I have installed with the old bolts (they have 32k) and torqued to spec, seems fine. Have to finish the job because I do have somewhere to go next weekend and don't want to be finishing this job too close to it. Bolts are steel, am I overthinking this? Should I just finish up the job and that be it or should I replace the bolts in a few weeks when I can? |
02-11-2024, 12:02 AM | #2 | |
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If you must reuse a bolt, just apply the torque and don't yield it. So maybe do half or 1/4 of the stretch angle and leave it at that until you're able to replace the bolt.
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02-11-2024, 05:39 AM | #3 | |
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I am tempted to just leave em be Last edited by MooMooM2; 02-11-2024 at 05:54 AM.. |
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02-11-2024, 06:52 AM | #4 | |
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Sometimes bmw specs to replace bolts because of corrosion issues and the risk of stripping, for instance the rotor retention bolts. These aren't torqued high enough to plastically deform yet they're replaced each time because they're so proned to coroding and stripping out. The brace bolts are likely torqued to plastic deformation, hence why they're single use. So imo if bmw says to replace it, chances are it needs to be replaced or else you risk not getting accurate clamling loads or a broken bolt.
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02-11-2024, 07:47 AM | #5 | |
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I will probably replace them next time I am there, I will buy the bolts and next time I have to get in the engine bay for something I will put them back on. I just don't want to disconnect the oil thermostat lines again lol, can make such a mess. Def learned from the first time I did it, this time got no oil anywhere which is great. I am replacing the rubber seals this time cuz last time I forgot to order some, no leaks but not going to do it again. I really need to slow down when I order stuff, always forget stuff lol, cheap stuff too which I then end up having to pay big shipping for like a bolt or a washer |
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