K2 / Proflex Riders Group

General => Tech Forum => Topic started by: royboycv on April 15, 2013, 01:20:56 pm

Title: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: royboycv on April 15, 2013, 01:20:56 pm

Hi, just got a LARGE ANIMAL frame ,which i was going to build up from parts from my XP-X (856 ) with the needle roller bearing mod , just to find a crack in the head tube at the top ,is the frame junk , or has any one had this problem and fixed it , was thinking of an ali ring over the top ,heated up and shrunk on ? Any body ,or just get another frame ?

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: Spokes on April 15, 2013, 03:05:26 pm

Shovelon is your man for all ali welding. He is a cycle frame maker/builder and can fix most things. His ali welding is second to none! If he doesnt pick up on this thread PM him for some advice.

Chris

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: shovelon on April 15, 2013, 10:33:44 pm

Proflex had a rash of cracks at the headset from overly tight headset fits.

Shrinking a sleeve over the cracked area will work fine.

Welding works but you need a mandrel to slip inside. Or use a worn steel headset race sourced from your LWS for cheap and groove out and fill the crack with weld. Then shrink out the race.  The frame is 7005, so the frame will work without heat treat. Just make sure the filler is 5356.

If the crack was at the bottom, I would source another frame because welding that area is tricky.

Terry

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: whisperdancer on April 16, 2013, 06:39:26 am

I once had a 757 on which the headtube started to crack in the upper headset.

"Someone" filled the crack for me, but a half of a dozen rides after, it started to crack again.
In the end, the head tube was cut from the rest of the frame and replaced by a new one (a little thicker than before).
The frame was resprayed, and the stickers were gone.

It worked very well and eventually I sold the frame (it was a way big and I thought I needed a large).

Here is the final result:

(http://idriders.com/proflex/smf/MGalleryItem.php?id=514)

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: royboycv on April 16, 2013, 09:38:58 am

Hi, thanks all for the help , i think i will try the collar first ,after that it will be replacement frame ,but that a nice job on the replacement head tube ,unles any body has a animal frame for sale ?large ,

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: Willie_B on April 16, 2013, 12:19:23 pm

I have a green Beast frame in large but I a in the USA. Want me to check on shipping?

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: Colin on April 17, 2013, 09:33:49 am

Quote from: royboycv on April 16, 2013, 09:38:58 am

Hi, thanks all for the help , i think i will try the collar first ,after that it will be replacement frame ,but that a nice job on the replacement head tube ,unles any body has a animal frame for sale ?large ,

Which "Animal" (or indeed, "Beast") do you mean?
PRO~FLEX/K2 used that name on x56's, x57's and the Y-frame Downhill model.

Col.

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: royboycv on April 17, 2013, 01:28:02 pm

Have to look at achive pics to sort out which is mine ,any clues ?

Title: Re: CRACKED HEAD TUBE ON FRAME , CAN WE FIX IT ?
Post by: royboycv on April 18, 2013, 12:45:57 pm

Hi,all found the frame to be a '97 Animal, Beast, & 757 Frame ,any help ,can any body help :'(