Diamond DA 42 NG, Maintenance Manual

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AIRCRAFT
DA 42 NG AMM Standard Practices
Doc # 7.02.15
Rev. 4
20-70-00
Page 1
15 Mar 2018
Section 20-70
Standard Practices - Engines
1. General
This Section gives you data about the fasteners used on the AE E4-B engines installed in the
DA 42 NG airplane. It also gives you the procedures for tightening the fasteners.
Refer to the AE Maintenance Manual, latest revision for more data.
2. Torque Values
Use the torque values given in tables 1 thru 4 for standard fasteners on the engine and use the torque
values given in table 5 for the components listed.
3. Special Torque Procedures
When you use self-locking nuts, add the safety torque (friction torque or braking torque) to the table
values. Set this value on the dial of the torque meter before you tighten the nut.
If a bolt has an additional torque due to shaft friction, add this torque value to the table value. Set this
calculated value on the dial of the torque meter before you tighten the bolt.
Lubricate threads unless shown differently.
CAUTION: YOU MUST ADD THE SAFETY TORQUE (OR THE FRICTION TORQUE)
TO THE FOLLOWING VALUES FOR SELF-LOCKING NUTS (OR BOLTS
WITH SHAFT FRICTION).
Table 1 - Standard Torque Values for Engine Bolts and Nuts
INCH THREAD TORQUE (Nm) TORQUE (lbf.ft.)
1/4 11 8
5/16 23 17
3/8 41 30
7/16 68 50
1/2 102 75
9/16 149 110
5/8 203 150
3/4 366 270