Crank arm just come loose - quick question

[R1 GTR]

I've never had to fix this before therefore havn't a clue what i'm doing

Ive loosened the centre bolt and pushed the arm back on but it wont go further than this:



I'm assuming it should, anyone got any tips? Another pic to help:



Thanks

[Trooper2]

There is usually some gap between the crank are and the bottom bracket for mud clearance. You don't specify whether you have a spline or square taper fit type of BB so here are removal and installation instructions for both:

Square spindle type-
http://www.parktool.com/repair/readhowto.asp?id=10...

Splined spindle type-
http://www.parktool.com/repair/readhowto.asp?id=12...


Tightening torque for the crank bolts are generally above 350 inch/pounds there is a chart with some common manufacturers recommended crank bolt torques about halfway down this page:

http://www.parktool.com/repair/readhowto.asp?id=88

Edited by Trooper2 on Sunday 10th February 15:47

[R1 GTR]

Its a splined spindle. More specifically, its a Truvativ Isoflow crank. But i think ive mislead you as to what happened. I wasnt trying to remove the BB, I was just riding along when I noticed how loose the arm (non chain-side) was. Then I looked down and I could see what looked like the spindle. I walked the bike back and took the centre bolt out and pushed the arm back on. This is where i didnt know how far on it was supposed to go, so all i'm asking is judging by the pictures, should that arm go on any further? The torque rating is on the bolt head also so no worries there.

[shalmaneser]

You've done great.

Just crank the bolt up as hard as you reasonably can, it will bottom out on a shoulder on the axle. Job's a good'un.

If you're feeling extra pro, put a touch of copper grease on the spindle, but if its already bolted up then don't worry about it.

Worth checking the other side too, while you're at it.

Adam.

[R1 GTR]

Cheers Adam, its already on but there looked to be plenty of grease on it anyway, after a quick google, it appears that these cranks are very well known for coming completely off after as little as 40km! Suppose i did well keeping mine tight for 9 months then .

[Trooper2]

R1 GTR said:

Its a splined spindle. More specifically, its a Truvativ Isoflow crank. But i think ive mislead you as to what happened. I wasnt trying to remove the BB, I was just riding along when I noticed how loose the arm (non chain-side) was. Then I looked down and I could see what looked like the spindle. I walked the bike back and took the centre bolt out and pushed the arm back on. This is where i didnt know how far on it was supposed to go, so all i'm asking is judging by the pictures, should that arm go on any further? The torque rating is on the bolt head also so no worries there.

So, you can't use the installation part of the instructions on the links I provided?

[R1 GTR]

Trooper2 said:

R1 GTR said:

Its a splined spindle. More specifically, its a Truvativ Isoflow crank. But i think ive mislead you as to what happened. I wasnt trying to remove the BB, I was just riding along when I noticed how loose the arm (non chain-side) was. Then I looked down and I could see what looked like the spindle. I walked the bike back and took the centre bolt out and pushed the arm back on. This is where i didnt know how far on it was supposed to go, so all i'm asking is judging by the pictures, should that arm go on any further? The torque rating is on the bolt head also so no worries there.

So, you can't use the installation part of the instructions on the links I provided?

I didnt get that far down the page