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Plasti gauge

Discussion in 'A3/S3 Forum (8L Chassis)' started by hoffmanvp3, Oct 19, 2013.

  1. hoffmanvp3
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    hoffmanvp3 Active Member

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    [Oct 19, 2013]
    Does any one know which colour of Plasti gauge to use for measuring your crank main and con rod clearances?
    As im getting conflicting info of Elsawin.




    Measuring radial clearance of conrods



    Special tools and workshop equipment required




    t
    Plastigage



    Procedure




    –
    Remove conrod bearing caps.




    –
    Clean bearing caps and bearing journals.




    –
    Place Plastigage onto bearing journal or into bearing shells corresponding to width of bearing.




    –
    Fit conrod bearing cap and tighten to 30 Nm. Do not rotate crankshaft.




    –
    Remove conrod bearing caps once more.




    –
    Compare width of Plastigage with measurement scale:



    Radial clearance:




    l
    New: 0.01 ... 0.05 mm.




    l
    Wear limit: 0.12 mm.




    –
    Renew bolts for conrod bearings.

    and




    Pistons and conrods - exploded view
    [​IMG] Note



    Oil spray jet and pressure relief valve → Fig.
    [​IMG]




    1 -
    Piston rings




    q
    Offset gaps by 120°




    q
    Use piston ring pliers to remove and install




    q
    “TOP” must face towards piston crown




    q
    Checking ring gap → Fig.




    q
    Checking ring-to-groove clearance → Fig.




    2 -
    Piston




    q
    Checking → Fig.




    q
    Mark installation position and cylinder number




    q
    Arrow on piston crown points to pulley end




    q
    Install using piston ring clamp




    q
    Piston and cylinder dimensions → Chapter




    3 -
    Conrod




    q
    Only renew as a complete set




    q
    Mark cylinder number -B-




    q
    Installation position: Markings -A- face towards pulley end




    q
    With oil drilling for piston pin lubrication




    4 -
    Conrod bearing cap




    q
    Mark cylinder number -B-




    q
    Installation position: Markings -A- face towards pulley end




    5 -
    30 Nm + 90° ([SUP]1[/SUP]/[SUB]4[/SUB] turn) further




    q
    Renew conrod bolt → Item




    q
    Lubricate threads and contact surface




    q
    To measure radial clearance, tighten to 30 Nm but do not turn further




    6 -
    Bearing shell




    q
    Upper bearing shell with oil hole for piston pin lubrication




    q
    Note installation position




    q
    Do not interchange used bearing shells (mark positions)




    q
    Ensure tight fit in retaining lugs




    q
    Axial clearance (new): 0.10 ... 0.35 mm




    q
    Axial clearance: wear limit: 0.40 mm




    q
    Measuring radial clearance → Chapter




    7 -
    Cylinder block




    q
    Checking cylinder bore → Fig.




    q
    Piston and cylinder dimensions → Chapter




    8 -
    Conrod bolt




    q
    Renew




    9 -
    Circlip




    10 -
    Piston pin




    q
    If difficult to move, heat piston to approx. 60 °C




    q
    Remove and install using drift -VW 222 A-
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  3. hoffmanvp3
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    hoffmanvp3 Active Member

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    [Oct 19, 2013]
    Think i just answered my own question lol
    Plasti gauge PL-X but can some one confirm this please?

    cheers
    Last edited: Oct 19, 2013
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