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#E46 m3 subframe crack mods
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#E46 m3 subframe crack drivers
The bare metal is then cleaned, primed and repainted before the sub-frame is re-attached.This sub-reddit is dedicated to everything related to BMW vehicles, tuning, racing, motorsport, and the community of BMW drivers around the world. As a precaution, we reinforce the mounting areas with extra steel plate and weld. We custom cut, form and weld new sheet metal for the areas where metal is missing (as in the above example). Simple cracks are first prepped and then welded. We next grind away the paint and body filler. After the sub-frame is removed (along with all the suspension, driveline, brakes and gas tank) the mounting areas are inspected.
The fix is relatively simple, though it is quite involved. The car from which these photos were taken showed a slight compression on the right side rear which indicated something was wrong- but it could have just as easily been a bad spring as a sub-frame mounting failure. Thanks to road grim that builds up on the chassis and the limited access to the mounting points, it is extremely difficult to spot these types of failures without removing much of the rear suspension or taking out the sub-frame all together. Here is a photo of the left rear mounting point failure: You can see the outside sheet metal has not only cracked, but chunks have broken off: Over time, the forces begin to fatigue the sheet metal of the body.īelow is a photo of the right side front sub-frame mounting point. The sub-frame is also subjected to impact forces from the road surface (though much of the impact force is directed towards the shock and spring mounts, not the sub-frame). When torque is sent through the axle and to the wheels, a moment is applied to the sub-frame. The sub-frame is bolted to the body at four locations, and isolated by rubber bushings.
Talking about sub-frame failures is a bit of a misnomer since it is the mounting points on the body that fail, not the sub-frame itself. The complete sub-frame with attachments removed from the car: Below you see the sub-frame assembly on the car: The differential nests within the box like frame and the suspension attaches to it. The above drawing shows the rear sub frame assembly (sometimes referred to as an axle carrier) for an E46 M3.