Disc Bolts

Garry · Post by **Garry** » Sun Jun 17, 2007 9:09 am

anyone any ideas for removing seized disc bolts other than grinding
the heads off or drilling?

i've got a set of front discs i want to swap but they are really tight and
if i'm not careful i'll end up chewing the centre out. i'm using an attachment on a socket set but they don't seem to want budge - just
the odd creak

wheel is KR1s so theres no hole i can squirt wd40 in to try and free
them

headcoats · Post by **headcoats** » Sun Jun 17, 2007 10:03 am

If they are creaking they are working loose,they are just very dry

On the subject i need some new bolts
Are the standard ones the ones to have or are there aftermarket ones to fit?

alanw · Post by **alanw** » Sun Jun 17, 2007 10:40 am

This may sound rough but give it a chance............. A good sharp small'ish
cold chisel & medium hammer . First make a nik on the outer edge of the bolt at a right angle to the bolt about 60 degrees of vertical (don't need to go to close to the anodized surface). Then keeping the chisel blade in the nik , tip the chisel clockwise and gently tap (progressively harder as needed) best if someone gently tries to unscrew the bolt with the allen key at the same time. .............don't be in big hurry. "tortoise & hare story" !!!!
This should shock the bolt around, obviously damages the bolt.
With a Hammer + chisel + SKILL & patience it's amazing what can be removed
Garry if you have more than 2 thumbs get someone else to try this

mgtkr1 · Post by **mgtkr1** » Sun Jun 17, 2007 4:36 pm

anyone heard of pe-nol? very effective penetrating spray, i know there is'nt a lot of space were normal spray such as wd40 would be needed but this stuff is baffling, youd be amazed at were/what it can free off. not sure were to get it from as my dad gets it from work but its in a blue/white tin. those disc bolts can be stubborn little bastards!

Cliff · Post by **Cliff** » Sun Jun 17, 2007 8:22 pm

Try a large allen key, apply as much pressure as you dare, and then repeatedly tap the elbow of the allen key with a hammer, it might just give.

Garry · Post by **Garry** » Sun Jun 17, 2007 9:04 pm

thanks for all the suggestions

i've sprayed plenty of wd40 around the heads on one side and left the
wheel flat untl tomorrow - don't suppose it will get through but worth
a try before more extreme measures

Red Devil 777 · Post by **Red Devil 777** » Sun Jun 17, 2007 9:38 pm

headcoats wrote:On the subject i need some new bolts
Are the standard ones the ones to have or are there aftermarket ones to fit?

You can get Titanium ones that fit the KR, Pro Bolt do them think they're about 6 quid ish each

So that's about eighty quid for a full set, yeah and I'm stupid enough to have bought them

I'm sure you can get stainless steel ones as well from either pro bolt or inox they claim that their stuff is of enough tensile strength for this application, I can't comment on that but would check before fitting.

If you're std ones are looking scruffy perhaps getting them replated may be an option.

Garry · Post by **Garry** » Sun Jun 17, 2007 10:52 pm

i've just used a fine wet and dry block to clean up another set and then
lacquered them - big improvement on their nasty appearance

as mark says replacements are very expensive

Garry · Post by **Garry** » Sat Jun 23, 2007 6:18 pm

took the bull by the horns - gave them more pressure than i really wanted to and theyve all come

out

Red Devil 777 · Post by **Red Devil 777** » Sat Jun 23, 2007 6:29 pm

Brute force and ignorance

Something I'm very good at

Badgerman · Post by **Badgerman** » Thu Jun 28, 2007 9:29 am

I find that you always have to go through the 'odd creaking' stage with disc bolts, but a tight allen key (socket in this case) and a large tap with a hammer usually gets em loose.

Badgerman

frog32 · Post by **frog32** » Sun Jul 15, 2007 10:19 am

did you manage to get them all out garry

Garry · Post by **Garry** » Sun Jul 15, 2007 4:40 pm

got them all out lee - head twisted off one of the ones in wheel i didn't need

read mr b's hints for removing studs so i'll try that at a later date
to get rest of it out

Mohawk · Post by **Mohawk** » Wed Jul 30, 2008 1:59 pm

Remember disc bolts will have been fitted with thread lock so will be a pain in the butt to remove but won't faill out whilst riding which could be catastrophic.

Two very good methods to help remove stubborn bolts;-

1. Use a drift or steel rod against the bolt head & tap hard with a hammer, the shock un-freezes the threads. An impact driver works well to with an allen key insert !

2. If the bolt is to be discarded & option 1 above has not worked, then gently heat the bolt head with a blow torch, once hot use option 1 to remove the bolt. The heat usually caused the whole setup to expand & free the threads.

Remember to use thread lock when you put the bolts back in !

mr_bungholeo · Post by **mr_bungholeo** » Wed Jul 30, 2008 7:33 pm

your better of heating the ali around the bolt with a hot air gun...the ali will expand faster than the steel and will expand outwards away from the bolt...