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Axle Pinch Bolts

Skutorr said:
20 years of repairing any vehicle that came in the door, foreign and domestic, and I never once saw one equipped from the factory with spark plug inserts.
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They are kind of hard to see. But, they are there. I learned about them in aircraft school , many aircraft engines have them.
 
Well, I I learned about them in bmw-scooters.com school, and my new plan is to still drill through the pinch bolt hole (just got a longer M6 bolt yesterday), not place a nut on the opposite side, rather a heli coil, maybe even a time sert. That is if the dealer can't get it warranted next week.
 
Sounds to me that your pinch bolt was over tightened. Steel bolts over tightened in aluminum threads often result in galling where the aluminum and steel threads lock ogether. When the bolt is removed a lot of the aluminum threads will be ripped out. A Heli Coil is an excellent repair. I've used them over the years on aircraft engines, outboard motors and various vehicles. They are stronger than the original installation. Don't gall either. The kits are in the $25-40 range depending on size. Most auto stores can supply the right size kit if you bring in the bolt. It's just a matter of drilling out the hole with the drill in the kit, twisting the coil in with the tool that comes with the kit and putting the bolt back in. Normally drilling out the hole is easy because it's really just a little bit larger than the original. When finished you can use the original bolt so everything stays standard.
 
Well, I can tell you that I have never used "Never Seize". However, I do think there are times when it should be seized. Depending, of course, on the mood of the seisure. Yanked, no. Seized, well, hell, yeah.

(Added just to let you guys know that all of us pay attention...even if we have no idea what you are talking about.)
 
exavid said:
Sounds to me that your pinch bolt was over tightened. Steel bolts over tightened in aluminum threads often result in galling where the aluminum and steel threads lock ogether. When the bolt is removed a lot of the aluminum threads will be ripped out. A Heli Coil is an excellent repair. I've used them over the years on aircraft engines, outboard motors and various vehicles. They are stronger than the original installation. Don't gall either. The kits are in the $25-40 range depending on size. Most auto stores can supply the right size kit if you bring in the bolt. It's just a matter of drilling out the hole with the drill in the kit, twisting the coil in with the tool that comes with the kit and putting the bolt back in. Normally drilling out the hole is easy because it's really just a little bit larger than the original. When finished you can use the original bolt so everything stays standard.
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I got back from the dealer, they believe they should be able to get BMW to warranty it. Thanks for your response.
 
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