Motion Pro 08-0134 Manuale di installazione e funzionamento
MOTION PRO, INC. 867 AMERICAN STREET SAN CARLOS, CA. 94070
PH. (650) 594-9600 FAX (650) 594-9610
INSTRUCTIONS FOR USING THE MOTION PRO #08-0134
TORQUE ADAPTOR WRENCH
The Motion Pro torque adaptor wrench is designed to be used with a torque wrench to accurately
tighten the cylinder base nuts on two-stroke engines that you cannot reach with a socket wrench.
How to use the Torque Adaptor Wrench:
When you mount the adaptor onto a torque wrench, it effectively lengthens the torque wrench. Therefore,
the torque value set on the torque wrench will not be the actual torque that you apply to the fastener.
Before using the torque adaptor, you must recalculate the torque specification listed in the engine’s
service manual. To recalculate your torque wrench when using the Motion Pro adaptor, use the extension
formula included with these instructions.
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After recalculating the torque specification, write it down here for future reference.
TORQUE ADAPTOR CORRECTION CHART
MODEL Ft.-lb. N-m
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To make conversions from one form to another, use the following torque conversion table:
MULTIPLY BY TO OBTAIN
foot-pounds (ft-lb.) 1.356 Newton-meters
foot-pounds 0.1383 kilogram-meters
foot-pounds 12.0 inch-pounds
inch-pounds (in.-lb.) 0.01152 kilogram-meters
inch-pounds 0.1130 Newton-meters
inch-pounds 0.08333 foot-pounds
kilogram-meters (kg-m) 7.233 foot-pounds
kilogram-meters 86.79 inch-pounds
kilogram-meters 9.806 Newton-meters
Newton-meters (N-m) 0.7375 foot-pounds
Newton-meters 8.851 inch-pounds
Newton-meters 0.1020 kilogram-meters
- OVER -
TORQUE ADAPTOR EXTENSION FORMULA
To recalculate a torque specification when using the Motion Pro torque adaptor, use the following
formula:
Corrected torque reading = Torque required xwrench length
Wrench length +extension length
T = Actual torque reading as listed in the service manual.
R = T x L
L + A
L = Torque wrench lever length. This is the lever length of your torque wrench--
center of grip to center of drive (see drawing). Refer to the instruction sheet
that came with your torque wrench on how to determine this length.
A = Torque adaptor extension length. When using the Motion Pro torque
adaptor, the torque adaptor length is 3 inches (See note below).
R = Corrected torque reading. (Indicated torque value to set on torque wrench.)
NOTE: When using 3 inches for distance “A”, torque wrench and torque adaptor must be in line. If the
adaptor is positioned at an angle to the torque wrench, distance “A” will be decreased. When the adaptor
is at a 90-degree angle to the torque wrench, distance “A” will be equal to zero (0).
Example: To tighten an engine’s cylinder base nuts to 20 ft.-lb. with the torque adaptor, and a torque
wrench with a lever length of 12 inches, compute the extension formula as follows:
1. List all of the known formula variables: T = 20 ft.-lb. (actual torque specification)
L = 12 in. (torque wrench lever length)
A = 3 in. (torque adaptor extension length)
2. Plug-in each of the formula variables into the
extension formula:
R = T x L = 20 x 12
L + A 12 + 3
3. Thus, you can solve the formula as follows: R = 20 x 12 = 240 = 16 ft.-lb.
12 + 3 15
Solution: In this example, your torque wrench would register 16 ft.-lb., but the cylinder base nuts would
be tightened to 20 ft.-lb.
1/21/02
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