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#11
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#12
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This is why some folk get creaking from the plate when the bolts aren't tight - the plate is pulling sideways on opposite corners and the bolt-to-plate joint creaks and groans.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#13
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A smaller bolt, like this, has more compliance than a bigger bolt would have. Maybe they needed that. Head bolts are often TTY for this reason. A 10.9 bolt that is already torqued past its yield stress is, by design, close to breaking. Maybe there is an intention for it to break away on a collision, as part of the crash design. Making your customers pay $100 for bolts each time the pan is removed may make financial sense. And it may dissuade some DIY mechanics from getting into the car more than they maybe should. Using M10 bolts may have saved them a couple of dollars over M12 bolts when initially built. And maybe they had a mandate to not spend a penny on lifetime beyond 100k miles. So while I re-use mine, and think I know enough to let me do it safely, I'd feel much better if I knew the true reason they did it. I doubt we'll ever know for sure.
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2001 X5 3.0i, 203k miles, AT, owned since 2014 |
#14
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#15
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#16
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I have to remove this plate since I have to get to the oil pan to remove all the plastic bits from my failed timing chain guides. I'm going to reuse the bolts and just torque them down super tight, so I guess we'll see what happens. No way am I ever paying that much for some bolts.
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2003 X5 4.6 | 2000 540i Touring Formerly owned: 2004 Range Rover | 2000 M5 | 2000 540i/6 1995 750il | 2003 Mercedes S500 | 2003 540i/6 |
#17
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Welds on tubular steel like this are very strong when compressed or stretched but not when twisted; the steel tends to fracture on the tube body along the weld line (the weld is often stronger than the thin-walled steel tube). Lean way back on the rear two legs of a welded steel chair for a bit and see what happens... Now bolt a square piece of thin alloy sheet to the legs on one side (or both), using four bolts and see if you can lean back for longer. The thin sheet will prevent the "square" steel frame from becoming a parallelogram, breaking the welds and collapsing. the sheet doesn't have to be thick, as all the forces are in the plane of the sheet. Just like on the E53... Need good bolts though (able to withstand high sheering forces), also like on the E53.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#18
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I think the main purpose of the plate was to act as a drip pan for any oil leaks from the oil pan, or transmission. Why else would they add a foam piece on top but to absorb all the oil. After all, when you are trying to sell an upmarket product, you don't want oil leaks on the marble tile floors in the garage.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#19
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It would appear to this pair of eyes to be both structural as well as functional. Note the comments about tubular steel strength at welds for the structural functionality.
It also functions as a "skid Plate" for any off roading type activities where something could impact and damage the oil pan. Would have been nice to have something going all the way back or another plate for the transmission pan protection Yeah, I would reuse the bolts for this plate application, however, for a bolt such as the crank pulley bolt, I would strongly consider replace that one. Mike
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Mike Dallas, TX & Appleton, WI 2003 E53 4.4i Pearl Beige 2003 E46 330Xi Monaco Blue 2007 E90 335Xi Black Sapphire Metallic 2011 F25 X3 28i Black Sapphire Metallic |
#20
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Anything internal or related to the engine gets new bolts (if required) as a rule of thumb when I work on cars. Whereas secondary parts like the skid plate won't really cause a catastrophic failure if an old bolt breaks, so I don't feel wrong reusing it.
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2003 X5 4.6 | 2000 540i Touring Formerly owned: 2004 Range Rover | 2000 M5 | 2000 540i/6 1995 750il | 2003 Mercedes S500 | 2003 540i/6 |
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