Results 1 to 9 of 9
  1. #1
    RoadBikeReview Member
    Reputation:
    Join Date
    Jul 2011
    Posts
    22

    Dogma AK61 Magnesium - unable to remove fork

    Hi all, I'm unable to remove the Onda fork from my 2004 dogma AK61 to change the bearing. I did speak to the local Pinarello dealer here in Singapore and they wouldn't touch it. Another shop had a go at removing the fork with the mallet method (seems to be the best way) but stopped short of due to fears of breaking the frame or forks. The top component of the headset and the spacers etc. had all been removed. The bike can be ridden ok but the bottom bearing recently experienced some pitting and now the handle bars return to centre. It is quite pronounced.

    So the question is what should I do? E.g. Is there a way of gradually lubricating the bottom parts and riding the bike with a little play in the headset to possibly loosen it up? If so, with what if the fork is carbon and the frame is magnesium?

    THanks for your kind help!

  2. #2
    Forever a Student
    Reputation: MMsRepBike's Avatar
    Join Date
    Mar 2014
    Posts
    4,742
    The Pinarello dealer should have known what to do.

    You hit it. Hard. With a deadblow hammer. It's a real pain in the arse.

    If you think getting it out sucks wait until you have to get it back in. That's where it gets tricky. Our official unofficial method of getting it back in involves a 2x4 and the hammer again.

    I'm nervous every time I do it. It has to be hit really hard. I would make the Pinarello dealer do it lol, that's what they're there for.
    use a torque wrench

  3. #3
    RoadBikeReview Member
    Reputation:
    Join Date
    Jul 2011
    Posts
    22
    Quote Originally Posted by MMsRepBike View Post
    The Pinarello dealer should have known what to do.

    You hit it. Hard. With a deadblow hammer. It's a real pain in the arse.

    If you think getting it out sucks wait until you have to get it back in. That's where it gets tricky. Our official unofficial method of getting it back in involves a 2x4 and the hammer again.

    I'm nervous every time I do it. It has to be hit really hard. I would make the Pinarello dealer do it lol, that's what they're there for.

    Thanks man. The local Pinarello dealer basically said that the risk of breaking something is quite high and refuses to touch it. The other shop was more helpful and they explained to me the risks while the bike was on the rack (held by the saddle post) and they were hammering the top of the forks. I was worried that the seat tube might be put under too much strain. It was getting a beating. Have you ever seen this process go wrong and something breaks?

  4. #4
    RoadBikeReview Member
    Reputation:
    Join Date
    Dec 2010
    Posts
    5,358
    I would be afraid to hit it with a hammer.
    The magnesium frames are a lot more fragile than carbon ones.

  5. #5
    RoadBikeReview Member
    Reputation:
    Join Date
    Dec 2005
    Posts
    4
    Quote Originally Posted by Cinelli 82220 View Post
    I would be afraid to hit it with a hammer.
    The magnesium frames are a lot more fragile than carbon ones.
    Nope...not at all. I own both. The carbon frame is way more fragile. Especially to non torsional forces like hammer blows.

    Did you get the fork out? Here is what I did. I sprayed some PB Blast silicon spray into the head tube once i removed the top cap and bearings. I then replaced them so they would stabilize the steer tube. I waited two days, i then installed a stem that left about 1cm of steer tube exposed, placed a small block of wood on top of the steer tube, and hit down firmly with a rubber mallet...it popped right out.

  6. #6
    RoadBikeReview Member
    Reputation:
    Join Date
    Jul 2011
    Posts
    22
    Quote Originally Posted by Stephencl View Post
    Nope...not at all. I own both. The carbon frame is way more fragile. Especially to non torsional forces like hammer blows.

    Did you get the fork out? Here is what I did. I sprayed some PB Blast silicon spray into the head tube once i removed the top cap and bearings. I then replaced them so they would stabilize the steer tube. I waited two days, i then installed a stem that left about 1cm of steer tube exposed, placed a small block of wood on top of the steer tube, and hit down firmly with a rubber mallet...it popped right out.

    Hey, thanks for the reply. No I didnt really try after that due to risks of breaking something. Attached is a picture of the frame, stem has been replaced with a standard one. Not sure how to get the top bearing out if the fork is still in. Sounds like that spray did the job in compination with a hard blow.

    Would you happen to know where I can pick up replacement bearings for this model? Is this the one you have?

    Dogma AK61 Magnesium - unable to remove fork-img_4513.jpg

  7. #7
    RoadBikeReview Member
    Reputation:
    Join Date
    Jul 2011
    Posts
    22
    Quote Originally Posted by Stephencl View Post
    Nope...not at all. I own both. The carbon frame is way more fragile. Especially to non torsional forces like hammer blows.

    Did you get the fork out? Here is what I did. I sprayed some PB Blast silicon spray into the head tube once i removed the top cap and bearings. I then replaced them so they would stabilize the steer tube. I waited two days, i then installed a stem that left about 1cm of steer tube exposed, placed a small block of wood on top of the steer tube, and hit down firmly with a rubber mallet...it popped right out.
    Didn't try to get this out since. The PB blast doesn't seem to be available here in Asia. I just managed to free the seat post after it had seized. I had taken it out 2 years ago but just wouldn't budge when I tried it this week.

    Then I came across this video https://youtu.be/54WhdrLKKvY from GCN that suggested to pour boiling hot water on the top of the frame. The seat post was freed as if by magic first time. I'm thinking that this is the logical step now to retry these forks due to thermal expansion of aluminium. Thoughts?

  8. #8
    RoadBikeReview Member
    Reputation:
    Join Date
    Jun 2012
    Posts
    40

    Dogma mag

    Quote Originally Posted by EdRoche View Post
    Hey, thanks for the reply. No I didnt really try after that due to risks of breaking something. Attached is a picture of the frame, stem has been replaced with a standard one. Not sure how to get the top bearing out if the fork is still in. Sounds like that spray did the job in compination with a hard blow.

    Would you happen to know where I can pick up replacement bearings for this model? Is this the one you have?

    Click image for larger version. 

Name:	IMG_4513.jpg 
Views:	380 
Size:	113.6 KB 
ID:	307075
    Did


    Did you ever get the fork out?

  9. #9
    RoadBikeReview Member
    Reputation:
    Join Date
    Jul 2011
    Posts
    22
    Quote Originally Posted by Bantamben View Post
    Did


    Did you ever get the fork out?
    Nope I didn't try. If I would try though it would be the hot water method.

Similar Threads

  1. Pinarello Dogma magnesium fp compared to new bikes?
    By HandyAndy in forum Pinarello
    Replies: 1
    Last Post: 06-17-2013, 08:20 AM
  2. Best way to remove paint from carbon fork?
    By RacerJRP in forum Components, Wrenching
    Replies: 9
    Last Post: 01-18-2010, 10:54 PM
  3. Magnesium or Carbon Dogma?
    By apark in forum Bikes, Frames and Forks
    Replies: 8
    Last Post: 01-10-2010, 05:43 PM
  4. magnesium frame for Loungers on Bonktown (dogma)
    By Coolhand in forum The Lounge
    Replies: 7
    Last Post: 03-04-2009, 06:38 AM
  5. Best way to remove paint from CF fork?
    By PseuZQ in forum Components, Wrenching
    Replies: 14
    Last Post: 01-29-2008, 12:07 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •