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Thread: disco 3 cambelt / flywheel timing holes

  1. 24th January 2011, 01:07 AM #1
    james1360 Guest

    disco 3 cambelt / flywheel timing holes

    Flywheel timing holes / cam belt[

    Vehicle:- Discovery 3 2009 auto (tiptronic)

    Posted on UK Disco3 site but need further help. So sorry if you reading it twice

    I have read through other posting / strings. on Cam belt replacement good but does not use Flywheel locking and so does not show / discuss that there are different holes within the Disco 3 flywheel.

    PLease can anyone tell me which of the four holes in the flywheel I need to use for the flywheel locking pin when setting the cam belt timing.

    I have to fault find the vehicle that may have run broken plastic throught the cam belt following damage to the front plastic cover. Though the belt looks ok the engine has not been turned since and concerned the belt may have jumped. Trailered home.

    Looking at a spare flywheel from landrover stores ( ordered but not purchased, just so we could look) There are are four holes on what appears to be the same PCD at around 9 to 10 mm diameter. Three are drilled right through and one is blind. I assume it is the blind hole but am worried this maybe the dynamic balanceing hole drilled for weight loss

    SO WHICH HOLE ?

    Does anyone know if the cam locking holes 5.9mm are the best place to hold the cams with the belt off to guarentee minimum valve lift on each cylinder bank ? If we have to rotate the engine all valves seated up is our desire. (but know it does not really exists on the V6 !) Maybe we need to pull cams but if someone knows if there is a low lift can positon it would reduce work !

    I cannot use the current belt postion or crank or cam postions as any reference as they maybe completely wrong
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  2. 24th January 2011, 02:41 PM #2
    400HPONGAS's Avatar
    400HPONGAS
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    I hope you have been looking at a FLEXplate and not a Flywheel as they are different. Why cant you do it as per 303-01C- In vehicle-Timing Belt.pdf ? Hard to see how it would get out of phase if the belt didnt come off .
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  3. 24th January 2011, 06:21 PM #3
    Blknight.aus's Avatar
    Blknight.aus
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    slice the old belt in half along its length so you wind up with 2 seperate belts running on the cam. pull the front one off. install the new belt in its position cut the other half belt off then slide the new belt home.

    easy.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  4. 24th January 2011, 08:30 PM #4
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    400HPONGAS
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    Brilliant idea Blknight !!! How bloody simple !
    But Our pommy mate thinks he cant trust the position of the belt , the cams and the crank . Youd think he would bar it over at least 4 Revs and check that all the timing marks still lineup . He could always pull and injector , stick in a measuring rod and determine TDC on 1 . without the cam event timing knowledge it would be tough to know exactly , but thats what the cam and crank reference sensors are for .
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  5. 24th January 2011, 09:13 PM #5
    Ean Austral Guest
    How can the timing marks be un-reliable if the belt or the gears never broke...

    As you say run it thru the cycle and see if they stay aligned..Or spill time it on #1 injector..


    Cheers Ean
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  6. 25th January 2011, 08:43 AM #6
    400HPONGAS's Avatar
    400HPONGAS
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    Spill timing ? you gonna have fun with a High pressure Common rail system finding spill timing !! .These relative new injection systems with their fancy Piezo injectors dont have any mechanical link , its all fancy electronics .
    The main problem is there are no timing marks per se , just a position for the crank and the 2 exhaust cams . the locking pins will only go in the one position .If the 2 cam locking pins go in then the crank locking pin will as well , if It dont then something has moved and then if it has moved , some of the valves may be saying hello to the piston , and therefore locking it all up .
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  7. 25th January 2011, 05:51 PM #7
    Ean Austral Guest
    Quote Originally Posted by 400HPONGAS View Post
    Spill timing ? you gonna have fun with a High pressure Common rail system finding spill timing !! .These relative new injection systems with their fancy Piezo injectors dont have any mechanical link , its all fancy electronics .
    The main problem is there are no timing marks per se , just a position for the crank and the 2 exhaust cams . the locking pins will only go in the one position .If the 2 cam locking pins go in then the crank locking pin will as well , if It dont then something has moved and then if it has moved , some of the valves may be saying hello to the piston , and therefore locking it all up .
    Yep, Realised what I said after I typed it and thought about it..to used to engines that have simple fuel systems..

    The old saying..make sure brain is in gear before engaging fingers on keyboards..

    Still doesnt explain how it would move with the belt still in situ..


    Cheers Ean
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