Missing belly pan bolt ...chassis weak?

8600RPM · 11-13-2017, 01:08 PM

I just saw,that one of the bolts on the aluminum belly pan was gone and tried to out one in but its,stripped.

I track my car a lot, should I get new pan?

pbonsalb · 11-13-2017, 03:09 PM

The pan is probably fine but you should fix the receiver in the subframe. Try re-threading. If it does not hold the torque you will have to do a bigger fix. I doubt one receiver stripped due to track use. Probably due to a mechanic impacting it in without first getting the threads started or by over impacting it so it spun when fully threaded.

8600RPM · 11-13-2017, 03:59 PM

No I am sorry I meant since I track I didn't want to leave a bolt out but if it would take an entire fix to the subframe I am sure the thing will be fine.

I did add spherical/monoball Front control arm (dinan) perhaps that will limit movement enough to offset the amount of stiffness lost from this?

8600RPM · 11-13-2017, 04:30 PM

Ok I checked again and noticed on the diagram that there are 3 larger bolts on each "side" of the reinforcement plate that appear to mount to the subframe. Then there are 2 bolts on the rear edge that seem to be there just to attached the tranny pan or whatever underbody paneling is there.

If someone could confirm this that would be great!

pbonsalb · 11-13-2017, 07:15 PM

The three small trans cover screw bolts do nothing for the aluminum pan or structural rigidity. I think there are 7 large bolts that secure the pan to the subframe.

11-13-2017, 01:08 PM	#1
8600RPM Lieutenant Colonel 658 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Missing belly pan bolt ...chassis weak? I just saw,that one of the bolts on the aluminum belly pan was gone and tried to out one in but its,stripped. I track my car a lot, should I get new pan? __________________ 2013 DCT ZCP Silverstone w/Silver/Novillo -Ohlins TTX 46/36 True Coilover 570F/450R-Delrin Subframe Bushings, Dinan Toe arm and Front Monoball, ECS RTA-Evolve Catless Xpipe, Schrick Cams 284/284 12mm Lift, BMC Filter, MS Pulley, EPIC 100 octane cam tune. PFC Front and Rear BBK, 19in Signature (9 and 10)-PSC2(275/255-35).BMW black chrome griles, gils, exhaust tips, M spoiler and M steering wheel, CSF Radiator/Oil Cooler
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11-13-2017, 03:09 PM	#2
pbonsalb Lieutenant General 5269 Rep 10,663 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	The pan is probably fine but you should fix the receiver in the subframe. Try re-threading. If it does not hold the torque you will have to do a bigger fix. I doubt one receiver stripped due to track use. Probably due to a mechanic impacting it in without first getting the threads started or by over impacting it so it spun when fully threaded.
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11-13-2017, 03:59 PM	#3
8600RPM Lieutenant Colonel 658 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	No I am sorry I meant since I track I didn't want to leave a bolt out but if it would take an entire fix to the subframe I am sure the thing will be fine. I did add spherical/monoball Front control arm (dinan) perhaps that will limit movement enough to offset the amount of stiffness lost from this? __________________ 2013 DCT ZCP Silverstone w/Silver/Novillo -Ohlins TTX 46/36 True Coilover 570F/450R-Delrin Subframe Bushings, Dinan Toe arm and Front Monoball, ECS RTA-Evolve Catless Xpipe, Schrick Cams 284/284 12mm Lift, BMC Filter, MS Pulley, EPIC 100 octane cam tune. PFC Front and Rear BBK, 19in Signature (9 and 10)-PSC2(275/255-35).BMW black chrome griles, gils, exhaust tips, M spoiler and M steering wheel, CSF Radiator/Oil Cooler
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11-13-2017, 04:30 PM	#4
8600RPM Lieutenant Colonel 658 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Ok I checked again and noticed on the diagram that there are 3 larger bolts on each "side" of the reinforcement plate that appear to mount to the subframe. Then there are 2 bolts on the rear edge that seem to be there just to attached the tranny pan or whatever underbody paneling is there. If someone could confirm this that would be great! __________________ 2013 DCT ZCP Silverstone w/Silver/Novillo -Ohlins TTX 46/36 True Coilover 570F/450R-Delrin Subframe Bushings, Dinan Toe arm and Front Monoball, ECS RTA-Evolve Catless Xpipe, Schrick Cams 284/284 12mm Lift, BMC Filter, MS Pulley, EPIC 100 octane cam tune. PFC Front and Rear BBK, 19in Signature (9 and 10)-PSC2(275/255-35).BMW black chrome griles, gils, exhaust tips, M spoiler and M steering wheel, CSF Radiator/Oil Cooler
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11-13-2017, 07:15 PM	#5
pbonsalb Lieutenant General 5269 Rep 10,663 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	The three small trans cover screw bolts do nothing for the aluminum pan or structural rigidity. I think there are 7 large bolts that secure the pan to the subframe.
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