Rev. 8
1–15
TORQUE VALUES
Torque applied is for the size of the bolt shank not the wrench size. On smaller bolts
use a torque wrench calibrated in inch pounds, not foot pounds
.
When tightening fasteners with self-locking nuts the chart values must be
modified. The friction drag torque must be determined and then added to the
standard torque from the table
. Due to the friction of the locking device noticeable
torque is required just to turn the nut onto the threads and does nothing to actually
tighten the parts together and stretch the bolt (clamp load). This is called friction drag
(or prevailing) torque. Run the nut down to where it nearly contacts the washer or
bearing surface and check the friction drag torque required to turn the nut. (At least one
thread should protrude from the nut). Add the friction drag torque to the standard torque.
This sum is referred to as the final (or total) torque, which should register on the
indicator or setting for a snap-over type torque wrench.
The propeller manufacturer and the engine manufacturer have specific torque
requirements for their equipment. Consult the appropriate manual for that information.
ft-lb
in-lb
N-m
Oil Tank Drain Screw
18
220
25
Oil Filter
C 3/4 Turn or as Specified
Magnetic Plug
18
220
25
Water Pump Drain Screw
8
90
10
Carburetor Socket Screws
11
135
15
Spark Plugs 16mm
15
180
20
Exhaust Nuts
9
106
12
AN
Bolt
size
Bolt size -
Threads per inch
Standard nuts
AN310, AN315,MS20365
Inch pounds
Foot Pounds
AN3
#10-32
20-25
1.6-2.0
AN4
1/4-20
50-70
4.2-5.8
AN5
5/16-24
100-140
8.3-11.6
AN6
3/8-24
160-190
13.3-15.8
AN7
7/16-20
450-500
37.5-41.7
AN8
1/2-20
480-690
40-57.5
AN9
9/16-18
800-1000
66.6-83.3
AN10
5/8-18
1100-1500
91.6-125
(Portions of this information has been adapted from AC 43. 13)
Summary of Contents for RV-12
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