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Thread: Slacken bolts for camshaft sproket? A3 8p 2.0 140

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  1. Question Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    Hello all,


    I am soon going to do my timing belt, water pump and rollers on my 2011 A3 Sportback, 2.0 140 engine code CFFB. Reading the manual and forums they say that you have to loosen the cam sproket and high pressure pump sproket when locked in place to be able to rotate them slightly.

    I would really appreciate it if somebody could explain why? Surely if you remove a toothed belt, refit the exact same thing, nothing should change?

    Or maybe it is just to make the removal, install easier.

    I don't know, but love to know as much as possible before doing a job and if I could know the "science" behind these loose sprockets I would be a happy chap.

    Thanks in advance guys
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    Last edited by Disco_jo; 30-04-2020 at 12:48 AM.
     
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  2. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
    #2
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    It is to take into account fractional differences between belts so allow in the the tooth spacing between all three points to be optimised and any slack taken up by the tensioner.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  3. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    Thank you for your reply, so I better loosen them when doing my timing then. Fingers crossed there will be no valve timing issues
     
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  4. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    Remember that the idler nut and stud, tensioner nut and stud, pump roller bolt and pump sprocket bolts are one time only Torque To Yield and MUST be replaced with the correct specification fastener.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  5. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    I ordered a Gates KP25649XS-1 kit that seems to have all the bits needed, all will be swaped out. If you don't mind could you give me the torque specs please? I have been seeing different values all over.
     
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  6. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    1 - Toothed belt

    2 - Idler roller

    3 – Nut, Renew, 20 Nm

    4 – Stud, Renew, 15 Nm

    5 – Nut, Renew, 20 Nm + turn 45° further

    6 - Tensioning roller

    7 – Stud, Renew, 15 Nm

    8 – Bolt, 20 Nm

    9 - Idler roller

    10 – Bolt, 25 Nm

    11 - Camshaft sprocket

    12 – Bolt, Slacken and tighten with counter hold tool -T10051-, 100 Nm

    13 - Camshaft hub

    14 - Plug

    15 - Toothed belt cover (rear)

    16 – Bolt, 9 Nm

    17 - High-pressure pump hub

    18 – Nut, 95 Nm

    19 - High-pressure pump sprocket

    20 – Bolt, Renew, 20 Nm

    21 - Idler roller

    22 – Bolt, Renew, 50 Nm + turn 90° further

    23 - O-ring, Renew

    24 - Coolant pump

    25 – Bolt, 15Nm

    26 - Crankshaft sprocket, Contact surface between sprocket and crankshaft must be free of oil

    27 – Bolt, Renew, Slacken and tighten with counter hold tool -3415- Do not additionally oil threads and shoulder

    Tighten in three stages as follows:

    1st stage: 180 Nm
    2nd stage: Use rigid wrench to turn 90° further
    3rd stage: Use rigid wrench to turn 45° further

    Toothed belt cover, Tighten bolts to 9 Nm.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  7. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    You are a star ! Thank you so much for your time and help
     
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  8. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
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    Quote Originally Posted by Crasher View Post



    1 - Toothed belt

    2 - Idler roller

    3 – Nut, Renew, 20 Nm

    4 – Stud, Renew, 15 Nm

    5 – Nut, Renew, 20 Nm + turn 45° further

    6 - Tensioning roller

    7 – Stud, Renew, 15 Nm

    8 – Bolt, 20 Nm

    9 - Idler roller

    10 – Bolt, 25 Nm

    11 - Camshaft sprocket

    12 – Bolt, Slacken and tighten with counter hold tool -T10051-, 100 Nm

    13 - Camshaft hub

    14 - Plug

    15 - Toothed belt cover (rear)

    16 – Bolt, 9 Nm

    17 - High-pressure pump hub

    18 – Nut, 95 Nm

    19 - High-pressure pump sprocket

    20 – Bolt, Renew, 20 Nm

    21 - Idler roller

    22 – Bolt, Renew, 50 Nm + turn 90° further

    23 - O-ring, Renew

    24 - Coolant pump

    25 – Bolt, 15Nm

    26 - Crankshaft sprocket, Contact surface between sprocket and crankshaft must be free of oil snaptube

    27 – Bolt, Renew, Slacken and tighten with counter hold tool -vidmate- Do not additionally oil threads and shoulder

    Tighten in three stages as follows:

    1st stage: 180 Nm
    2nd stage: Use rigid wrench to turn 90° further
    3rd stage: Use rigid wrench to turn 45° further

    Toothed belt cover, Tighten bolts to 9 Nm.

    I was looking for this, Thanks for helping!
     
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  9. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
    #9
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    If your timing is ok before you re-place your timing belt do not slacken camshafts bolts as long as you have the proper timing tools your belt will slip on & tension up ok
     
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  10. Re: Slacken bolts for camshaft sproket? A3 8p 2.0 140 
    #10
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    Quote Originally Posted by elitclark View Post
    I was looking for this, Thanks for helping!
    We are lucky to have a human encyclopedia like Crasher around !
     
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