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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 05-07-2016, 03:14 AM
binbin93 binbin93 is offline
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Tightening Torque BMW aluminium bolt

Hi everyone,

I will replace alternator of 2007 BMW X5 E70 3.0si, there are 4 aluminium bolts mounting alternator to engine block. please advise me what is tightening torque for these bolts? due to it's aluminium so I worry of broken if over tighten.

thanks in advance
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  #2  
Old 05-07-2016, 03:34 AM
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Doug Huffman Doug Huffman is online now
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Here is guidance. Note the caveat.

http://www.federalscrewproducts.com/torque-chart.htm
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  #3  
Old 05-07-2016, 04:15 AM
PAX5 PAX5 is online now
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Quote:
Originally Posted by binbin93 View Post
Hi everyone,

I will replace alternator of 2007 BMW X5 E70 3.0si, there are 4 aluminium bolts mounting alternator to engine block. please advise me what is tightening torque for these bolts? due to it's aluminium so I worry of broken if over tighten.

thanks in advance
I have never known BMW to use aluminum bolts ... Are you sure?
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  #4  
Old 05-07-2016, 05:00 AM
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roboe60 roboe60 is offline
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TIS indicates to use new aluminum bolts. Tightening torque is 10 Nm, then additional 180 degrees.
See TIS http://http://workshop-manuals.com/bmw/x_series_e70/x5_3.0si_n52k_offrd/4_tightening_torques/12__engine_electrical_system_(n52k)/31__alternator_with_drive_and_mounting/2_azd__alternator_with_drive_and_mounting_parts/
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Old 05-07-2016, 06:01 AM
binbin93 binbin93 is offline
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thanks for your advice.
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  #6  
Old 05-07-2016, 06:12 AM
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Doug Huffman Doug Huffman is online now
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I see the torque plus turn, but is the specification to aluminum on that page?
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  #7  
Old 05-07-2016, 06:42 AM
ingenieur ingenieur is offline
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One time use Aluminum:

http://www.realoem.com/bmw/enUS/show...diagId=12_1637
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  #8  
Old 05-07-2016, 08:49 AM
DefSport DefSport is offline
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Quote:
Originally Posted by PAX5 View Post
I have never known BMW to use aluminum bolts ... Are you sure?
They're all over modern BMWs. Every bolt that threads into the magnesium engine block is aluminum due to galvanic corrosion with coated steel bolts.

They're typically torque to yield to take into account the large elastic release of aluminum (roughly 100-150% more than the typical steel fastener torqued to 75% proof). This allows the bolt to account for clamp load variations better since it's like a softer spring stretched further.
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  #9  
Old 05-07-2016, 09:05 AM
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BLT BLT is offline
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Quote:
Originally Posted by binbin93 View Post
Hi everyone,

I will replace alternator of 2007 BMW X5 E70 3.0si, there are 4 aluminium bolts mounting alternator to engine block. please advise me what is tightening torque for these bolts? due to it's aluminium so I worry of broken if over tighten.

thanks in advance
Do not reuse any aluminum fasteners, they are a one use only bolt, they need to be replaced and not reused. Reusing aluminum fasteners will cause you grief, don't do it.
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  #10  
Old 05-07-2016, 10:44 AM
ard ard is offline
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Quote:
Originally Posted by roboe60 View Post
To the OP...

Make sure you understand this...it is a special way to torque fasteners.... Not just a torque value.
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