Thread: Timing Belt

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  1. #1 Timing Belt 
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    Are these 3.4 dohc engines interference engines? Belt brokeon my 96 gtp.
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  2. #2 Re: Timing Belt 
    donated to get this wow TorqueAutoMotiv's Avatar
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    Timing Belt Timing Procedure

    <A href="http://sm.gpona.com:9001/servlets/BlobShtml?ShtmlFile=63421&psdid=16&evc=sm#ss1-63417">Camshaft Timing Procedure

    Tools Required
    J 38613-A Camshaft Timing Clamps


    1. <LI type=1>Ensure that the camshaft sprockets rotate freely on the camshafts.
      Notice

      Ensure that the bolt hole is free of any debris before installing the J 38613-A or the camshaft carrier may be damaged.

      <LI type=1>Install the J 38613-A on both camshaft carriers.


      <LI type=1>Rotate the crankshaft so that the #1 cylinder is at TDC.


      <LI type=1>Align the timing mark with the cast arrow at the upper right of the crankshaft. Mark the timing indicator with white paint (or equivalent) on the crankshaft and front cover. Tighten Tighten both right hand (rear bank) camshaft sprockets to 130 N·m (96 lb ft).

      Notice

      Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

      <LI type=1>Remove the J 38613-A from the right rear camshaft carrier. <LI type=1>Rotate the crankshaft 360° and align the timing marks. <LI type=1>Ensure that both right (rear) camshaft flats are down. Tighten Tighten both left hand (front bank) camshaft sprockets to 130 N·m (96 lb ft).
      <LI type=1>Remove the J 38613-A from the left (front) camshaft carrier. <LI type=1>Rotate the crankshaft 720° in order to set the timing belt tension and verify correct timing.
    2. Ensure that both camshaft flats are up on one bank and down on the opposing bank.

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  3. #3 Re: Timing Belt 
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    Thanks for the article. But I need to know if I bent valves before I replace the belt.
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  4. #4 Re: Timing Belt 
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    that im not sure on f the belt just snapped probably not but if it slipped first and messed up timing then snapped it could have
    You would have to do a compression test to see

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  5. #5 Re: Timing Belt 
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    Quote Originally Posted by wickedintent79 View Post
    that im not sure on f the belt just snapped probably not but if it slipped first and messed up timing then snapped it could have
    You would have to do a compression test to see
    Yeah the belt slipped never broke. and the engine died. Tried to crank it to restart and of course it did not. I would have to change the belt to test compression.
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  6. #6 Re: Timing Belt 
    donated to get this wow TorqueAutoMotiv's Avatar
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    Yea sorry lol triing to give info or advice while drinking isnt good thats my bad
    But yea you would have to replace the belt to find out if it bent the valves or not

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  7. #7 Re: Timing Belt 
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    Thats what I figured. Thanks for the info!!
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  8. #8 Re: Timing Belt 
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    Is that procidure the same as it would be for my 91 gtp 3.4?
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  9. #9 Re: Timing Belt 
    The Blue One blueguy's Avatar
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    Yes...it is the same from '91 to '94...then they changed the entire fuel system, made about 15-20 more horses, then it went out of production in '97...
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  10. #10 Re: Timing Belt 
    GTX Level Member Pittman06's Avatar
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    the only way to really know if you bent a valve slightly is to pull the heads and look, or to get it running and wait for the tickin... if you think there way bent get a belt on and do a compression test first.
    F clean cars, I Ride Dirty!.....to hide the wicked body damage...
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  11. #11 Re: Timing Belt 
    The Blue One blueguy's Avatar
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    All I gotta say is have fun doing anything to a 3.4 DOHC no matter WHAT your doing
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  12. #12 Re: Timing Belt 
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    Update....Every valve was bent. NO GOOD
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  13. #13 Re: Timing Belt 
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    Kinda what happens when it goes... BOOM!
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  14. #14 Re: Timing Belt 
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    Any suggestion for valve train replacements parts for my 91?
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