2009 LAMBORGHINI MURCIÉLAGO Service Repair Manual

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Proceed as follows: • Install the prescribed tentative adjusting shims ( $)LJ) and (%)LJ ):
Tentative adjusting shim A: sA=1.75 mm
Tentative adjusting shim B: sB=1.10 mm


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•
Check the correct bearing pre-load as follows:
•  LQVWDOODVXLWDEOHWRROIRUPHDVXULQJWKHUROOLQJWRUTXHRQDD[OHVKDIWÀDQJH
7KHSODQHWDU\JHDUVHWGRHVQRWQHHGWREHIDVWHQHGWKDQNVWRWKHLQWULQVLFFKDUDFWHULVWLFVRIWKLV differential.
• Check that the rolling torque (ignoring the pickup one) is within the prescribed values.

•Work on adjusting shim ( $)LJ) if this is not so:
• to increase torque odecrease the value of shim A;
• to decrease torque oincrease the value of shim A.

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The pinion bearing pre-load and the pinion height are strictly related: in case of pre-load adjustment check
and, if necessary, adjust the pinion height: in case of pinion height adjustment check and, if necessary,
adjust the pinion pre-load: each operation is correctly carried out only if the pinion pre-load and the pinion height are within the prescribed values.
• Remove the hubs and the differential assembly.
• Install both the pinion roller bearing outer rings to the differential carrier.
• Install the tentative shim ( $)LJ)to the pinion:
sD=1.5 mm
• Install the taper roller bearing to the pinion ( %)LJ).
• Install the tentative spacer ( &)LJ) to the pinion:
sC=16.85 mm

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•Check the correct bearing pre-load as follows:
• install a suitable tool for measuring the rolling torque on the pinion splined shaft;
• check that the rolling torque, ignoring the pickup one, is within the prescribed values.
• if this is not so, operate on spacer ( &)LJ) thickness as follows:
• to increase torque odecrease the thickness of spacer C;
• to decrease torque oincrease the thickness of spacer C.
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The pinion bearing pre-load and the pinion height are strictly related: in case of pre-load adjustment check
and, if necessary, adjust the pinion height: in case of pinion height adjustment check and, if necessary,
adjust the pinion pre-load: each operation is correctly carried out only if the pinion pre-load and the pinion height are within the prescribed values.

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•
Install E special tool in the hub seats and check that the dial gauge reading is within the
prescribed values:
dimension X: 51.69 ” 0.03 mm
• In case the value in not within the prescribed values, operate on the adjusting shims ( ')LJ) as follows:
• to increase dimension X odecrease shim D;
• to decrease dimension X oincrease shim D;
• check dimension X again.

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• Install the hubs and the differential.
•  ,QVWDOOWKHSUHYLRXVO\LGHQWL¿HGDGMXVWLQJVKLPV $%)LJ), position the differential assembly, install the hub on
both sides and tighten the nuts to the prescribed tightening torque.
• Check the correct pinion-crown clearance as follows:
• check that the value is within the prescribed values by means of a dial gauge:
pinion-crown clearance: 0.09 – 0.12 mm

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•if it is not, without varying the crown bearing pre-load, operate on the adjusting shims as follows:
• to decrease the clearance o decrease shim B and increase shim A accordingly;
• to increase the clearance o increase shim B and decrease shim A accordingly;
• Remove the hubs at the end of the operation.

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