Help - rusty 17mm bolt in subframe mounts 280 SEL 4,5 1972 - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 09-05-2011, 05:10 PM Thread Starter
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Help - rusty 17mm bolt in subframe mounts 280 SEL 4,5 1972

Does someone have experience with removing them? I cant get of the biggest bolt 17mm It has become a bit rounded too. Is it better to remove the small bolts completly first, then take the biggest bolt of?
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post #2 of 6 (permalink) Old 09-05-2011, 05:14 PM
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Does someone have experience with removing them? I cant get of the biggest bolt 17mm It has become a bit rounded too. Is it better to remove the small bolts completly first, then take the biggest bolt of?
Hammer a 11/16 on it.

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post #3 of 6 (permalink) Old 09-05-2011, 09:25 PM
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Soak it with penetrating oil (WD 40) overnight and see if that helps. I've used blow torches and hair driers to heat the things too.

For the broken bolt, you'll need to tap it out - basically drill a hole through the center of the bolt and screw in a reverse thread tap, which then takes out the bolt. Make sure you have spare time to do this.
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post #4 of 6 (permalink) Old 09-06-2011, 08:24 AM
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Grube's right, IF the bolt breaks, (IT did to me once) big trouble, That bolt comes with the subframe kit for a good reason, The bolt tends to rust and break-off right above the threads in the subframe. You will need a long tap drill and some precise centerpunching to drill and tap the subframe threads,
Hope that the bolt does not break.

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post #5 of 6 (permalink) Old 09-06-2011, 09:50 AM
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No disrespect meant, but forget WD40, it stands for Water Displacement and is great for keeping rust at bay, for shafts, engine cylinders or bearing journals.

Instead, use PBlaster, Kroil or my fave, a 50/50 mix of ATF and Acetone. Spray or use an oil can to apply the mixture to the bolt area. It will soak into the crevices and loosen the bolt. Expect this soaking and spraying to take several days or maybe a week. the ATF/Acetone is the best choice, and relatively cheap too.

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post #6 of 6 (permalink) Old 09-08-2011, 05:41 AM
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Quote:
Originally Posted by wbain View Post
Instead, use PBlaster, Kroil or my fave, a 50/50 mix of ATF and Acetone. the ATF/Acetone is the best choice, and relatively cheap too.

Hmmmm. I'm going to have to remember this one. Such a trick might come in handy
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