Big-End Bearing-Crank Pin Clearance; Tightening Procedure - Ducati MONSTER 821 Workshop Manual

Big-end bearing-crank pin clearance

In order to correctly couple big-end bearings and crank pin, proceed as follows:
apply a strip (A) of GREEN "Plastigauge PG-1" to the crank pin;
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fit the connecting rod and the original big-end bearings.
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Tightening procedure

Tighten the connecting rod bolts (Class 14.9) as described below:
apply the recommended threadlocker to the thread;
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tighten the screw to a torque of 35 Nm ± 10% at 50 rpm;
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wait for 2 seconds then loosen by 360° at 30 rpm;
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tighten to a snug torque of 20 Nm ± 10% at 30 rpm;
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tighten to a snug torque of 35 Nm ± 10% at 10 rpm;
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tighten with a rotation of 65° ± 1° at 14 rpm;
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Check the applied tightening torque (Min. 70 Nm - Max. 113 Nm).
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Continue the coupling procedure as described below:
loosen the screws and remove the connecting rod;
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check the thickness of the strip of "GREEN Plastigauge PG-1" (A), using the suitable reference scale
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(B);
the thickness measured with scale (B) represents the actual clearance: if it is not within the specified
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limits (Crankshaft), it is necessary to replace the bearings or the crankshaft and repeat the procedure;
If the clearance value complies with the established limits, carefully remove the strip of "GREEN
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Plastigauge PG-1" (A) from the crankshaft and repeat the tightening procedure as described.
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