Quote:
Originally Posted by monkeycsl
Will be getting the resin injected into my crack then pardon the pun.the bmw bushes have. A raised lip which puts pressure on a small area but the power flex ones are flat so they must help.
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If you look at online photos of cracks and really significant failures you will see that the cracks usually develop around the actual bush mounting - often when it tears it also tears an area larger than weld in plates out. The worst one I've seen with welded plates in was on a car where rust proofing failed and it basically dropped the whole floor out of the car - very nasty.
Bear in mind that the subframe bushings are there to act as a damper, so by enlarging the foot print area and going to a harder bushing you are transfering a higher load into the floor, thus eliminating any benefits you might gain out of the larger foot print (if it even helps at all)
Quote:
Originally Posted by s.mac
Any links on how to do this Tom?? Sounds like its worth doing
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Monkeycsl beat me to it ....
Few things to remember about this fix :
1. it is the 'official' BMW recommended repair if the floor cracks are less than 25mm (basically they drill out the end of the crack to stop it spreading, weld the crack itself, and then inject this epoxy).
2. If the floor is replaced by BMW, the secondary repair requires that this epoxy be injected to prevent future tear (I've taken this as to mean that it is considered a secondary preventative fix designed by BMW to prevent this from happening in the future).
3. The epoxy is only injected into the rear two mounting spots - if you want to you can also do the front two mounting points - these can be accessed via the rear seat belt belt clip bolt holes - just make sure you don't squirt too much in those thus making it impossible to reinstall your seatbelt belt clips. Personally I only did the rear two mounting points as this is considered sufficient by BMW.
For the cost of the epoxy and foam, I am of the opinion that it is a worth while preventative maintenance to do on the car - and you don't run into rust issues in the future. It also looks very original after the injection (you are only drilling one hole in the middle of the floor ridge afterall - and a plastic bung is provided with the kit to seal this to make it look factory).
NB - very important to not move the car for at least 24 hours after you've injected the stuff ... leave it for two days if the weather is warm.