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308 flywheel

Discussion in 'Technical Q&A' started by ria, Jun 7, 2004.

  1. ria

    ria Formula Junior

    Nov 2, 2003
    725
    ohio
    Full Name:
    phill
    i try to take the flywheel bolts of to replase the pilot bearing i can NOT brake the bolts loose on the flywheel . i use a torque wrench nothing. i was thinking to grind the lip of to the same size as the bearing then i know it will come off i do NOT want to do this in this way. any proceger on how to do this. maybe their is lock tight on this bolts any info on this???? thanks.
     
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  3. mk e

    mk e F1 World Champ

    Oct 31, 2003
    11,505
    The twilight zone
    Full Name:
    The Butcher
    I use an impact wrench and they come right out. For re-torquing made a small aluminum block the engages about 6 teeth on the flywheel and locks it to the bell housing.
     
  4. finnerty

    finnerty F1 World Champ

    May 18, 2004
    10,341
    Also you can remove the starter and insert a prybar or large screwdriver to engage a tooth and brace against the bell housing --- be careful, if it slips, you can break a tooth on the flywheel. Best to have 2 people for this --- one on the prybar, one on the flywheel bolts.
     
  5. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,149
    way north california
    Full Name:
    chris morse
    Try to borrow a flywheel locking clamp. broken teeth are a real drag.
    Do not use a torque wrench, use an air impact or a breaker bar, (with possibly a cheater if you lack the air power.
    Use a shallow 6 point socket, (not 12 point or worse a deep 12 point) to wrench on the nuts - less likely hood of stripping the heads.

    sounds like fun, wish i were doing a rebuild on the 308, (and I had a fairy god mother to buy really hot rebuild parts).

    regards, chris
     
  6. ricrain

    ricrain Karting

    Nov 1, 2003
    195
    Dallas Area
    Full Name:
    Ric
    When replacing the flywheel, always, always use blue Loctite on the bolts. Clean the bolt holes and the bolts before applying the stuff. I got to see pictures of a 308 GT/4 who's flywheel came loose...
     
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  8. ferrarifixer

    ferrarifixer F1 Veteran
    BANNED

    Jul 22, 2003
    8,520
    Melbourne
    Full Name:
    Phil Hughes
    You don't need to remove the flywheel to replace the spigot bearing, by the way!

    Just use a readily available expanding collet slide hammer attachment, or you can hydraulic it out with grease and a bit of bar to fit the 15mm spigot hole.....
     
  9. ria

    ria Formula Junior

    Nov 2, 2003
    725
    ohio
    Full Name:
    phill
    the bearing will not com out the big warcher that the bolts go to hold the flywheel in plase there is a lip if the lip was the same size as the bearing then the bearing will come right out . i will try to hold the crank big bolt on the other side to try to get the bolts to come out on flywheel.
     
  10. 308GTS

    308GTS Formula 3

    Dec 27, 2001
    2,220
    TN
    I thought the flywheel had to be removed on a 308 to get the pilot bearing out. Anyone clarify?
     
  11. finnerty

    finnerty F1 World Champ

    May 18, 2004
    10,341
    ria is correct ---

    On the 308 2-valves, the gang washer has too small of an ID to allow the bearing to pass through. Plus, if you are going to the trouble of replacing the pilot bearing (assuming a clutch job is going on here) you should treat yourself to re-surfaced flywheel as well.

    I don't know if I would hold the crank bolt --- this will put a helluva lot of torque on the crankshaft --- probably okay, but a broken crank shaft would certainly break my heart. Lots of things will work at the flywheel side --- stuffing rags, wooden blocks, etc. between the teeth and a boss inside the bell housing.

    Also, don't foget about the obvious --- try heating the bolts with a propane torch to break the corrosion / loctite in the threads. Factory spec torque on the flywheel bolts is only about 60 ft-lbs --- shouldn't be too hard to crack once the heat breaks the bond between threads.
     
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  13. ria

    ria Formula Junior

    Nov 2, 2003
    725
    ohio
    Full Name:
    phill
    OK the mistake i made was i use a long exta with the torque wrench this time i did NOT i was only 2 inch from the bolts thay come right of. i want to THANK all of you for the info. now i will take the flywheel to the shop.
     
  14. Wayne 962

    Wayne 962 Formula Junior

    Nov 27, 2003
    434
    Torque wrenches should only be used to tighten nuts - not remove them. An electric or air impact wrench is what you should be using...

    -Wayne
     
  15. ria

    ria Formula Junior

    Nov 2, 2003
    725
    ohio
    Full Name:
    phill
    wayne i used a air impact wrench.
     
  16. Wayne 962

    Wayne 962 Formula Junior

    Nov 27, 2003
    434
    Okay - you did say "torque" wrench in all of your posts...

    :)

    -Wayne
     

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