PeachParts Mercedes-Benz Forum - View Single Post - How do I stop this from hapenning again? W210 Broken plug syndrome

aklim · #13 02-26-2008, 09:58 AM

I R&R them once a year. This last time it was over a year so it was a little sticky. Finally got it out without breaking. Also used quite a bit of penetrating oil. For the sticky ones, half turn out, squirt, half turn back in, wait a bit, turn it out half turn and then turn it out another half turn and repeat.

All plugs are coated with anti-seize from the top of the threads to the bottom where it seats. Obviously not the tips.

To ream it out, I prefer a gun bore brush. Get a cheap cleaning kit from Wal*Mart because for #6 you are going to have to bend the rod. I got 2 cheap brushes. One for the smaller part since it is going into the hole where the tip goes and one for the larger part. Here is the trick, with the reamer, because it is a still piece of metal, you cannot be larger than the small bore. With a wire brush that is used in the guns, you can get it larger and it will neck down.