2 replies to this topic

[AntsClubby]

Hey,
Ive took my rear subby off and had one of the lower bolts sheer on the trunnion mounting point.
Like i said the subbys off and im just left with an approx 15mm peg!
Ive tried WD40 etc for days yet it still wont shift!

Do i need heat or should i try to grind it flat and drill it out? Im worried about damaging the internal thread though!

Anyone been here before?
The other side sheered off too...how i dont know as the steel was like tin foil and fell out!
If im replacing one panel already should i just do both?, dont really want to cut out a good panel though just because of a snapped bolt!

Any help would be great!
Cheers

[mini_in_progress]

3 out of the 4 of mine snapped, im going to weld new panels in tho, if yours is all 100% solid tho, you could peal back the outer sill and grind the captive nut off then weld a new nut on...but after the effort may as well replace the heelboard end..

[dklawson]

Before replacement and cutting... try a penetrating oil, not WD-40. If you do not have access to penetrating oil, the DIY mix is 50% acetone mixed with 50% automatic transmission fluid.

Heat the part of the bolt that remains. Quench it with your penetrating oil. Strike the end of the broken bolt like you were driving a nail with a hammer. Then heat again, quench again, hammer again. Do that several times, then give the joint a day for the oil to soak in. The next day, hammer the end of the bolt a couple of times, then use a pair of mole grips on the bolt. Do NOT try and spin it out at the start. Try tightening slightly, then try to loosen. Keep doing that... tighten, loosen over and over again while keeping the bolt wet with penetrating oil. When it starts to turn, keep working it back and forth to work the oil into the threads. Do not be tempted to just spin it out. Keep working the bolt in and out moving it out a little bit each time until you finally free the broken bit.

Before putting the subframe back in place, chase the old female threads with a tap to clean out all the old rust and dirt. During re-assembly you could put anti-seize compound on the threads but Loctite will also prevent future corrosion and also secure the new bolt.