Results 1 to 9 of 9

Thread: 4AGE 20V Blacktop - Crank bolt stuck hard

  1. #1
    Senior Member Futo_gt86's Avatar
    Join Date
    Mar 2011
    Name
    Ali
    State
    QLD
    Location
    4300
    Country
    Australia
    Posts
    728

    Default 4AGE 20V Blacktop - Crank bolt stuck hard

    Car - AE71 Pano

    motor / part in question - 4AGE 20V Blacktop

    problem - Crank bolt stuck hard

    occurs/started when (if applicable)- Timing Belt Change

    personal situation (if applicable)- Wild

    Doing timing belt change on 20V Blacktop motor (motor out of car)
    I firstly used a tool I made to hold the crank pulley in place so I could get the bolt undone.
    Used it before with no issues on multiple engines.
    It bent and cracked, so I bought a proper pulley holder.
    Been waiting for delivery, hanging out to get this tool and get job done.
    It arrived yesterday, so had a little play around with it to familiarize myself with it.
    So just now I got to use it and this happened.

    Click image for larger version. 

Name:	DSC_0259.JPG 
Views:	42 
Size:	253.1 KB 
ID:	37312

    This Crank bolt is on with some serious force.
    I think someone has used locktite and hammered the thing up with a rattle gun.
    My next thought is to lock the flywheel in place with a ring gear locking tool.
    My problem is, if I lock the ring gear I'm transfering all pressure on the rear of the crank.
    Is there any change I can snap the crank wilst hanging of a breaker bar?
    I'm serious, this bolt is farken tight. I know 4AG use a forged steel crank form factory, so this is a plus, but is it possible?
    Last edited by Futo_gt86; 2nd March 2017 at 12:09 PM.

  2. #2
    Member
    Join Date
    Jan 2015
    Name
    Dave
    State
    Michigan
    Location
    South Lyon
    Country
    USA
    Posts
    65

    Default

    I have an alloy crank pulley so I have to either lock the ring gear thru the starter mount, if in the car, or the back side of the block, if on the engine stand. Never had any problems with either method. I think your best option would be to borrow or rent an impact driver. I've used a breaker bar and a extension pipe and still could not loosen the bolt. One zap with the impact gun and the bolt came right off. Dave W

  3. #3
    Noooob
    Join Date
    Jun 2010
    Name
    Matt
    State
    NSW
    Location
    Campbelltown
    Country
    Australia
    Posts
    5,246

    Default

    Another way is to put a long breaker bar between the crank pulley and chassis rail and blip the starter motor but shit can go wrong if you don't do it properly and make sure you remove leads etc so the motor won't start.
    Last edited by Matt; 3rd March 2017 at 10:11 AM.
    Ae86 Drivingclub - Toyota AE86 Car Club where AE86 | KE70 | Toyota 86 / GT86 | Subaru BRZ | Scion FRS owners

  4. #4
    Senior Member Futo_gt86's Avatar
    Join Date
    Mar 2011
    Name
    Ali
    State
    QLD
    Location
    4300
    Country
    Australia
    Posts
    728

    Default

    OK, I should be able to get access to Impact Gun.

    Yep, I've had success with Starter Bump method before, but this time the engine is out of car..

  5. #5
    Noooob
    Join Date
    Jun 2010
    Name
    Matt
    State
    NSW
    Location
    Campbelltown
    Country
    Australia
    Posts
    5,246

    Default

    Another option is lock the cams with a shifter or a large flat head in the flywheel locking it where the starter motor goes

  6. #6
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    909

    Default

    I've had success with a bit of chain bolted between one of the outer holes in the flywheel and a suitable hole on the block. May be tricky to get a flywheel on there depending how it's bolted to the stand. but should be possible.

  7. #7
    Senior Member
    Join Date
    Jun 2011
    Name
    james
    State
    oxford
    Location
    general area
    Country
    England
    Posts
    131

    Default

    Heat from a propane torch will help to loosen the Loctite grip.
    Another way is to remove the sump and use a stout, clean block of wood between the crank and block.

  8. #8
    Senior Member Futo_gt86's Avatar
    Join Date
    Mar 2011
    Name
    Ali
    State
    QLD
    Location
    4300
    Country
    Australia
    Posts
    728

    Default

    Borrowed $800 impact gun, did the job first go!
    I got to get me one of those.

  9. #9
    Veteran LittleRedSpirit's Avatar
    Join Date
    Dec 2008
    Name
    Matt
    State
    QLD
    Location
    West
    Country
    Australia
    Posts
    1,988

    Default

    Rattle ftw. I think its safer than the starter bump method, which puts stress on extra components beyond where the problem lies. Nice work.

    The little cordless rattle guns are great for general assembly too. So incredibly fast.






Similar Threads

  1. ST20v crank bolt part number
    By tezza88 in forum Technical - Questions
    Replies: 4
    Last Post: 30th March 2015, 02:16 AM
  2. blacktop 20v crank and rods
    By grantobius in forum Car Parts For Sale
    Replies: 7
    Last Post: 17th April 2009, 08:56 AM
  3. Blacktop crank
    By rallystanza in forum Cars or Parts Wanted
    Replies: 3
    Last Post: 17th February 2009, 09:29 PM
  4. blacktop crank ready to go brisbane
    By wide s13 in forum Car Parts For Sale
    Replies: 2
    Last Post: 24th December 2008, 07:01 PM
  5. 4age Crank Pully Bolt
    By newby86 in forum General Topics (No Technical Questions)
    Replies: 5
    Last Post: 5th February 2006, 08:50 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
  •