ARMY TM 9-6115-670-14&P
I-1
APPENDIX I
TORQUE LIMITS
I-1. SCOPE.
This appendix describes how to determine the torque limits for screws, bolts, and nuts used on the
Auxiliary Power Unit (APU) to help you properly tighten fastener hardware for safe and efficient
operation of the equipment.
I-2. TORQUE VALUES.
Screws, bolts and nuts must be tightened to the specified torque value using a torque wrench. Several
fasteners, such as the screws, bolts, and nuts used on the APU engine cylinder head, must also be
tightened in a set proper sequence. Tables I-1 and I-2 provide torque values for various kinds of general
and special use hardware.
I-2.1. Torque Values for Special Use Screws, Nuts, and Bolts. Table I-1 provides torque values for
special use screws, nuts, and bolts. Identify the special use fastener under ITEM and read the torque
from the columns to the right.
Table I-1. Torque Values for Special Use Screws, Bolts and Nuts
Item
Size x Pitch
Nm
Ft-Lbs
*
Head cover cap nuts
M6 x 1.0
3.9 to 5.9
2.9 to 4.3
*
Head bolts
M8 x 1.25
39.2 to 44.1
28.9 to 32.5
*
Bearing case bolts 1
M6 x 1.0
12.7 to 15.7
9.4 to 11.6
*
Bearing case bolts 2
M7 x 1.0
26.5 to 30.4
19.5 to 22.4
*
Flywheel bolts
M10 x 1.25
53.9 to 58.8
39.8 to 43.4
*
Connecting rod bolts
M7 x 0.75
26.5 to 30.4
19.5 to 22.4
*
Rocker arm bracket nuts
M6 x 1.0
9.81 to 11.28
7.23 to 8.32
*
Idle gear shaft bolts
M6 x 1.0
9.81 to 11.28
7.23 to 8.32
Glow plugs
M8 x 1.0
7.8 to 14.7
5.8 to 10.8
Nozzle holder assembly
M20 x 1.5
49.0 to 68.6
36.2 to 50.6
Oil switch taper screw
PT 1/8
14.7 to 19.6
10.8 to 14.5
Injection pipe retaining nuts
M12 x 1.5
24.5 to 34.3
18.1 to 25.3
For "*" marked screws, bolts, and nuts, apply engine oil to threads and seats before tightening.
