Timing belt change.. HELP!? [308GT4] | FerrariChat

Timing belt change.. HELP!? [308GT4]

Discussion in 'Technical Q&A' started by Jaimediego, Jun 10, 2012.

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  1. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    We're in the middle of the timing belt change.. BUT
    The procedure narrative I have.. talks about holding the cams in a hex shaped section between the cam belt pulley and the cam seal with an adjustable wrench..
    BUT I HAVE NO HEX SECTION THAT A WRENCH COULD STABILIZE THE CAM.. While a 70-80 ft-lbs nut could be removed.. or replaced.

    WHAT DO I USE TO HOLD THE CAM? My cam is ROUND there.. ?

    Thanks.. Jim :D

    P.S. Do I have the wrong torque? My OEM manual says 11 kg .. We converted that to 77 ft-lbs

    P.P.S. The only thing we can see to use is a ViseGrip plier (with pipe?) to hold in the round cam section between the cam belt pulley.. and the cam seal.. ?? Air wrench?? HelP!
     
  2. Matto

    Matto Formula 3

    Dec 26, 2011
    2,085
    Mooresville, NC USA
    Full Name:
    Matthew
    #2 Matto, Jun 10, 2012
    Last edited: Jun 10, 2012
    If you're just changing belts/tensioner bearings, you just need to lock the pulleys in place, so that you can remove and replace the belts using your reference marks: http://ferrarichat.com/forum/showpost.php?p=136588448&postcount=8

    Pulleys do not need to come off for a belt/tensioner bearing replacement.

    If you're needing to remove the pulleys completely, the cams should be out and on the bench, in a vise, etc.
     
  3. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    Thanks! That makes sense now! Well, we wanted to replace cam seals .. trying to tighten up engine.. traditionally, big oil leaker! Maybe Trans too?

    Trying to replace gaskets on bottom surrounding drain plugs.. .
    Surprised with springs, piston, and ball bearings on trans bottom plate.. but think we understand THAT..

    NOW.. we cant get plate off where oil drain plug is.. ?? Italian parts catalog shows studs on the TOP of those divider wings attached to bottom plate? Is it possible for us to remove and replace bottom plate for engine oil.. without removing something else?? Almost looks like (feels like) bottom plate IS held on something at top of those wings.. like splash guards (??) .. But, nothing in parts catalog to show .. . ???

    Please Help again? Yes I'm starting to see the $3-5K service fee! (Maybe THEY know what they're doing? Ha!)

    Thanks, Jim :D
     
  4. Brian Harper

    Brian Harper F1 Rookie
    Owner Silver Subscribed

    Feb 17, 2006
    4,078
    San Jose area
    Full Name:
    Brian Harper
    The oil pan will come out only after you remove the oil temp sensor (front of sump next to shift rod) and the oil dipstick tube. Search and you will find threads on the dipstick tube, but in short there is a short tube that you need to pull up after you remove the long upper tube. Then the pan comes down and out with a little rotation rearward.
     
  5. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,257
    socal
    Yes they do if you are going to get anything close to decent timing.
     
  6. Matto

    Matto Formula 3

    Dec 26, 2011
    2,085
    Mooresville, NC USA
    Full Name:
    Matthew
    Yes, it's true....cam seals are a different thing altogether.
     
  7. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    WELL.. I can see now.. after removing one cam... that the cam seals can be slid on three of the cams without removing cam belt pulley.. RiGhT!?

    The rear exhaust cam has the left side air pump pulley.. which I hope can be removed easily.. so we don't have to remove the cam belt pulley there either?

    Whats best way to seal .. cam seal .. outer surfaces to head/cam cover when replacing new seals? Dry or RTV (HondaBond.. Got some Saturday).. ?? Mine was leaking there! Old seal was apparently installed dry.. ?

    Thanks for all your help guys! I don't have to tell you.. we'd be in trouble without your guidance.. .

    Jim :D
     
  8. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    WELL.. My cam marks .. all 4 .. line up perfectly at TDC! So.. should be able to replace seals.. and timing belts.. to SAME configuration .. and get proper cam timing.. RiGhT?

    Jim :D
     
  9. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    Thanks AgAiN!!! I will certainly search for info thread!

    BTW.. My parts guy gave me 2 O-Rings for the shift rod mechanism.. Do I remove the shift rod that is visible with the gearbox plate off? Slide it forward? Is it indexed somehow.. or do I need to carefully mark the clamped end? Help (again please)!

    Thanks, Jim :D
     
  10. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,406
    Houston, Texas
    Full Name:
    Bubba
    Don't drop the oil pan blind, take a look at the parts diagram IIRC there are ball bearings and springs that are part of the oil pressure regulator that will also come loose....

    The other thing to know is that the cam timing marks are assembly guides, they do not put the cm in the .5 degree tolerance that is the specification, that is what the pegs/holes in the gears are for to get the final level of accuracy, using a degree wheel.
     
  11. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    1) Oh JOY! More springs.. and ball bearings! Ha! [Like we got from the gearbox pan?]
    What is IIRC? Ferrari clearing house? Sorry.. please explain..

    2) SO, you are saying.. I need to reset cam timing .. because it might be off? Even though our goal is to check valves (done), cam seals (less leaks!), gaskets (less leaks), and change timing belts, plugs, oil, gear oil. Please explain further, if it is appropriate for me to check further??? [Degree Wheel? - I know just enough to know THAT is a big undertaking.]

    Thanks, Jim :D
     
  12. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,406
    Houston, Texas
    Full Name:
    Bubba
    Don't trust my Technical Posts!

    Maybe the gearbox pan is where the springs/balls are from the oil pump.

    IIRC is for "If I Recall Correctly".....A "clamp and go" on the belts just means the car will run "like it did before"....a degree wheel check will get it "as good as it can be".....something to think about when a single tooth on the wheel/belt is about 3 degrees....
     
  13. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    WeLL.. the parts catalog doesn't even show the piston, springs and balls! Crazy.. . AT ALL!!!

    Jim :D
     
  14. fastradio

    fastradio F1 Rookie
    BANNED Professional Ferrari Technician

    Apr 26, 2006
    3,664
    New England
    Full Name:
    David Feinberg
    #14 fastradio, Jun 11, 2012
    Last edited by a moderator: Sep 7, 2017
    Sure it does, Page 23...
    Image Unavailable, Please Login
     
  15. kena

    kena Formula 3

    May 20, 2007
    1,607
    Salt Ash
    Full Name:
    Ken Abrahams
     
  16. Jaimediego

    Jaimediego Karting

    Sep 9, 2011
    116
    Fresno, CA
    Full Name:
    Jim
    IC.. I was looking at pans pic! Thanks. [Do you put all that back with lithium grease.. holding parts up.. while the gearbox pan is bolted up.. ?]

    Is there a thread for the oil dipstick.. oil pan removal?

    Thanks, Jim :D
     

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