Results 1 to 10 of 10

Thread: Lower Control Arm Front Pivot Bolt

Discussions of Triumph motor cars

  1. #1
    Luke Skywalker KVH's Avatar
    Join Date
    Jan 2005
    Location
    Arizona
    Posts
    1,853
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Lower Control Arm Front Pivot Bolt

    For a TR4A, if I put a jack under the spring pan, can I remove and replace the pivot bolt holding the control arms together?

    I don't like the bolt or the trunnion I now have. I want to replace both. But I don't want to remove the spring and go through all that again.

    I suppose that with the spring still in, and with the control arms bolted to the pan, that pivot bolt might be jammed in too tight to slide it out. Or, maybe just slightly loosening the pan fastening bolts would help.

    Thoughts? If I just need to remove the spring, I will.

    Thanks all.

  2. #2
    Jedi Knight
    Join Date
    Nov 2005
    Location
    Pittsburgh PA
    Posts
    878
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Lower Control Arm Front Pivot Bolt

    Smarter folks than I will chime in... but I don't think you can remove the trunnion without unloading the spring.
    Mike
    66 TR4A

  3. #3
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Southlake, TX, USA
    Posts
    4,741
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    5
    Thanked in
    5 Posts

    Re: Lower Control Arm Front Pivot Bolt

    That bolt is actually a long pin pressed into the trunnion. I know of no way to remove it without removing the pan and lower arms. I have ruined 12 ton presses attempting to remove the pin from the trunnion, although the manual implies it should be relatively loose fitting.
    John

    1955 TR2

  4. #4
    Jedi Warrior
    Join Date
    Jun 2010
    Location
    Hudson, OH
    Posts
    575
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Lower Control Arm Front Pivot Bolt

    Quote Originally Posted by CJD View Post
    That bolt is actually a long pin pressed into the trunnion. I know of no way to remove it without removing the pan and lower arms. I have ruined 12 ton presses attempting to remove the pin from the trunnion, although the manual implies it should be relatively loose fitting.
    On a 4A thru the TR6 that "pin" is a through bolt, not a "pin" as stated above. TR4 back to TR2 it is a "pin".

  5. #5
    Jedi Knight
    Join Date
    Nov 2005
    Location
    Pittsburgh PA
    Posts
    878
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Lower Control Arm Front Pivot Bolt

    Quote Originally Posted by JerryVV View Post
    On a 4A thru the TR6 that "pin" is a through bolt, not a "pin" as stated above. TR4 back to TR2 it is a "pin".
    Correct.

    Sounds like a bit of disassembly is headed your way... sorry!
    Mike
    66 TR4A

  6. #6
    Jedi Warrior
    Join Date
    Jun 2010
    Location
    Hudson, OH
    Posts
    575
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Lower Control Arm Front Pivot Bolt

    Jack under the spring pan and lift enough to just lift the car. You should then be able to remove the bolt and the trunnion unless things have corroded together. Assembly is reverse. Shock will keep things together.

  7. #7
    Luke Skywalker KVH's Avatar
    Join Date
    Jan 2005
    Location
    Arizona
    Posts
    1,853
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Lower Control Arm Front Pivot Bolt

    I just thought of something. There's no engine or transmission in the car. If I jack under the spring pan, will it still work, or leave it all too tight? Maybe I just take that darn spring pan back off after all?

  8. #8
    Jedi Warrior
    Join Date
    Jun 2010
    Location
    Hudson, OH
    Posts
    575
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: Lower Control Arm Front Pivot Bolt

    You might try a spring compressor in lieu of the shock to relieve the spring pressure. Without the weight of the engine I doubt that jacking under the spring pan will compress the spring.

  9. #9
    Jedi Trainee TRopic6's Avatar
    Join Date
    Jan 2007
    Location
    Irmo, SC
    Posts
    303
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    2
    Thanked in
    2 Posts

    Re: Lower Control Arm Front Pivot Bolt

    Yeah - if you can get the spring pressure under control, you might be able to use the new bolt to push the old one out. That should keep the two A-arms and trunnion in alignment. If bolt-head orientation (or originality) is a factor, you could tap in another new bolt from the other side.

  10. #10
    Jedi Knight
    Join Date
    Nov 2005
    Location
    Pittsburgh PA
    Posts
    878
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Re: Lower Control Arm Front Pivot Bolt

    Spring compressor goes right down the middle of the spring - there is considerable disassembly required to get to it. The frame is not heavy enough to compress the spring... a lot more mass is needed!
    Mike
    66 TR4A

Bookmarks

Posting Permissions

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