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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > Stiffening Plate (Belly Pan) Bolts

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      05-18-2018, 02:39 AM   #1
Nezil
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Stiffening Plate (Belly Pan) Bolts

Last weekend I fitted my Fabspeed Sport Cat, which required removal of the front chassis stiffening plate. I know a few people have done this before, and in the DIY threads, no-one has ever posted about replacing the bolts that hold this on, even though ISTA+ gives torque settings of 56Nm + 90 degree rotation, and states that the bolts must be replaced.

This evening I had to remove the stiffening plate again to fit an upgraded Charge Pipe, and as I was putting the plate back on, I started to get concerned that these bolts might sheer if I don't replace them. I know the torque + angle tightening sequence is designed to stretch the bolts, and that doing this is only possible a few times.

I have an upgraded FMIC on its way, and will likely need to remove the stiffening plate again... I'm thinking of getting some new bolts this time, but wanted to hear feedback from others on the forum... is this really necessary?

Thanks in advance!
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      05-18-2018, 01:02 PM   #2
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Just got a quote for these bolts from my local dealer... $8.65 each!

They offered to give me a discount to bring it down to ~$5.20 each... still very very expensive for an M10 x 33 bolt.
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      05-18-2018, 02:07 PM   #3
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I didn't replace my bolts but I did manage to damage the threads on one of the bolts. I am currently missing one bolt securing the belly pan lol. Need to visit the dealership and get a quote. Cheap online but shipping ruins it.
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      06-01-2018, 06:28 AM   #4
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I've done this twice already without replacing them. I'm probably going to replace them soon.. these are definitely torque to yield bolts and the belly pan acts as a lower chassis brace.
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      06-03-2018, 10:37 AM   #5
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Quote:
Originally Posted by greasypeanut View Post
I didn't replace my bolts but I did manage to damage the threads on one of the bolts. I am currently missing one bolt securing the belly pan lol. Need to visit the dealership and get a quote. Cheap online but shipping ruins it.
Do you by chance have the part number for them?
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      06-03-2018, 12:08 PM   #6
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Quote:
Originally Posted by nothingman View Post
Do you by chance have the part number for them?
33326768354
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