The following chart will help you calculate the target torque value
when you use an extension to your wrench.Especially useful for the assembly of Superbike heads. Now, the torque values for the head are very critical
and must follow a specific procedure. I'll quote the book:
"Fit the two guide bushes on the stud bolts, grease the threaded ends with "AGIP GR 33PD" grease (part no. 944600808).
Fit cylinder head on the crankcase stud bolts and push it down against the cylinder.
Grease the special washers appropriately and fit them on the stud bolts with their flat side down.
Tighten head nuts, in a cross pattern. Use special wrench 88713.1139 combined with a torque wrench.Torque up nuts in three steps:
1. tighten them to 1.5 Kgm (14.7 Nm)
2. tighten them to 3 Kgm (29.4 Nm)
3. Final torque to 5.2 Kgm (50.9 Nm)
After running in, re-torque to 5.2 +/- 0.10 Kgm (50.9 +/- 1 Nm)Caution: Any procedure other than that outlined here may lead to abnormal
stretch of stud bolts with severe damage to the engine".
If you can't use the chart below download the Excel file here
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This page was last modified on: 05/21/05
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