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#21
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2010 BMW M6 * Black Saphire Metallic * Full Black Merino Leather 2019 BMW X3 M40i * Alpine White * Mocha Leather |
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#22
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Coming back to this. Anyone who found alternatives discover anything to report?
Are those Dodge bolts good to use? Do they fit the stock nuts?
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E46 M3 | E30 318is | E53 X5 4.8is | E39 530i |
#23
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While I appreciate the fast response. I am not comfortable re-using the old bolts.
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E46 M3 | E30 318is | E53 X5 4.8is | E39 530i |
#24
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Quote:
To me, any decent replacement grade bolt would do the job. I'm guessing these are stretch bolts/TTY so that they will shear in the case of an accident... so you may compromise that a little, but if you hit something hard enough for that to be an issue... other things might be more concerning. Personally, I plan on re-using the stock bolts...
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#25
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recently had engine replaced, then the transmission went out about 1k miles later.
replaced tranny, and car was great.... Then a squeak developed. slight at first, then horrible. I thought it was the front differential, so I changed the fluid. Helped some, but still there. Then I realized I had read somewhere someone saying they had a horrible squeak if they reused the old reinf. plate bolts. so, bought some new ones, reinstalled to spec and...voila. No more squeek. The old bolts were clearly no longer straight. so I think after 3 removal/reinstalls, they are done. Check the bolts carefully: if you see that they are no longer true, I recommend replacing them. so yes, despited all the engineers in the thread, the bolts do make a difference |
#26
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Quote:
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#27
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Sure is, reminiscent of the $90 wiper blades owners used to have to buy directly from BMW for the e39. BMW got in trouble for that if memory serves...
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#28
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Quote:
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I love this forum!!!! Alan 1999 BMW 328i sedan with auto...In progress... 2002 BMW X5 3.0i with auto...In progress... 2007 BMW Z4 3.0i 6 speed manual...In progress... |
#29
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This looks like an old thread, but I would imagine you would want to tighten them to the same spec (i.e., with 90deg turn). I just reused my original bolts after changing the front diff fluid, didn't add the full 90deg turn, and am definitely hearing some creaking underneath at slow speeds. I'm going to go back and re-tighten but would consider replacing if I could find a cheaper alternative to OEM like these.
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#30
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Quote:
The standard pitch for M10 is 1.5mm. If you change that to 1.25mm, the torque value and angle value will be different. The angle is easy to consider - 90 degrees on a 1.5mm pitch bolt will stretch the bolt by 0.25 * 1.5 = 0.375mm. On the 1.25mm pitch bolt, it will be 0.25 * 1.25 = 0.3125mm. The initial torque value will be different, but not so easy to analyze because that is dominated by friction. There is nothing magic about these class 10.9 bolts BMW overcharges you for. During the torquing of the 90 degree angle, the bolt (and maybe nut) exceeds the yield stress and deforms plastically. This work hardens it, making it stronger (higher yield strength; not affecting the tensile strength), but not stiffer than when it was new. This "feature" is usually why TTY is used - you get the increased strength you want, but without increasing stiffness (e.g., when a certain amount of compliance is required). So when you remove and reinstall them (like I do), you should NOT torque them and then apply the same angle as you would use on new bolts. If you do that, each time you R+R them you will be pushing further into the plastic region, eventually exceeding the tensile strength, at which point they will break, either while tightening them or when you're out driving. Ideally, you would torque them back to their exact stretch before you removed them, but you do not want any further plastic deformation. A completely different way to analyze this issue, not relying on engineering, would be to phone a few BMW dealers and ask how long it will take to get these parts in stock. My understanding is they don't stock them because they don't use them. They re-use the existing ones, thinking far less about it than I or others on this list have. I expect they'll do this until it causes a problem - and are still waiting for that to happen. It would be good to know what torque+angle procedure they follow on re-used bolts, but it should be different from that used for new bolts. Hopefully they know that.
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2001 X5 3.0i, 203k miles, AT, owned since 2014 Last edited by oldskewel; 04-14-2016 at 11:25 PM. |
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