how to undo a really really stiff bolt

Oakesy2001uk · 12 Dec 2006 at 23:39

I find a soaking in WD, then a good smack on the head of the bolt in question does wonders. After that breaker bar for the win

233 · 12 Dec 2006 at 23:45

angle grinder

AmDaMan · 12 Dec 2006 at 23:48

impact wrench if you can get to it, i guarantee it will get it off.

[huzeeee] · 13 Dec 2006 at 00:03

If ALL fails, run a 3-4mm drill down the centre of the bolt. This can relieve some pressure from the bolt. If that doesnt work drill the hole bigger but make sure the threads are safe.

triggerthat · 13 Dec 2006 at 00:34

[huzeeee] said:
Do you even know what a torqe wrench is?

Never question a don.

-westy- · 13 Dec 2006 at 02:52

[huzeeee] said:
Do you even know what a torqe wrench is?

Probably not, but at least he can spell it

JTrickle · 13 Dec 2006 at 08:14

TomO said:
already tried this.

unfortunately the bolt only has a recess for a hex bit to fit in rather than socket set to get round and it keeps slipping out.

I bought a hex bit for my torque wrench when fitting my 310 upgrade. I would use a breaker bar with extension scaffold and repeated treatments of penetrating fluid/wd40 and blow torch heating.

D4VE · 13 Dec 2006 at 08:34

Careful, dont just use loads of force, I did that and snapped the head off the bolt

Caliper bolts are a ****** to do, impact wrench, heat, maybe some penetrating oil like WD40.

1CE · 13 Dec 2006 at 08:45

Second the wd40 trick, I just spray em with the stuff and leave it over night.

Wicksta · 13 Dec 2006 at 08:51

Heat is your friend.

jimblowscash · 13 Dec 2006 at 09:22

Gilly said:
Torque wrench + liberal force?

for gods sake dont undo a really stiff bolt with a torque wrench youll kill it, only use a torque wrench for tightning not undoing, youll knacker the torque / clicky thingy...... use a big breaker bar and heat from a blow lamp but be carefull not to heat up any associated brake lines as brake fluid is more flamable than petrol and doesnt like being boiled!!!