[Fusion1250]

buddy of mine cross threaded one of the subframe bolts. passenger rear bolt on the front to be exact. what's the best way to go about fixing this? I figured drilling out and heli coil or re tapping it?

[lookalikehuuh]

I guess that depends on how bad the hole is currently, you might be able to just re-tap it directly and have it work ok or you may need to go full with helicoil.

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[mainbearing]

I am pretty careful with hand threading bolts first. However, one of the rear bolt (one that goes 45 degrees into the chassis) had damaged threads. They felt fine while removing, and I could not understand why the threads were damaged.

I suspected that even with a jack supporting the subframe there might be some downward force on those rear bolts just before coming loose that buggered the threads.

Anyway, can be fixed by a tap and die set $20 at Harbor Freight (https://www.harborfreight.com/carbon...-pc-62832.html). The first turn of the thread was slightly buggered that a milder "thread chaser" would not thread either. I believe it was the M12-1.5.

Therefore I suggest removing these two rear bolts first, then move to the middle ones and finally the front two bolts. Installation iirc Bentley says to install the fronts first. Therefore reverse the order.

[Fusion1250]

Originally Posted by mainbearing

I am pretty careful with hand threading bolts first. However, one of the rear bolt (one that goes 45 degrees into the chassis) had damaged threads. They felt fine while removing, and I could not understand why the threads were damaged.

I suspected that even with a jack supporting the subframe there might be some downward force on those rear bolts just before coming loose that buggered the threads.

Anyway, can be fixed by a tap and die set $20 at Harbor Freight (https://www.harborfreight.com/carbon...-pc-62832.html). The first turn of the thread was slightly buggered that a milder "thread chaser" would not thread either. I believe it was the M12-1.5.

Therefore I suggest removing these two rear bolts first, then move to the middle ones and finally the front two bolts. Installation iirc Bentley says to install the fronts first. Therefore reverse the order.

thank you