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GENERAL INFORMATION OA-9
used as a method of interference between nut and bolt
threads (figure 18).
A prevailing torque bolt is designed to develop an
interference between bolt and nut threads, or the
threads of a tapped hole. This is accomplished by dis
torting some of the threads or by using a nylon patch or
adhesive.
Recommendations For Reuse:
1. Clean, unrusted prevailing torque nuts and bolts '
may be reused as follows:
A. Clean dirt and other foreign material off the nut
or bolt.
B. Inspect the nut or bolt to ensure there are no
cracks, elongation, or other signs of abuse or
overtightening. (If there is any doubt, replace
with a new prevailing torque fastener of equal
or greater strength).
C. Assemble the parts and hand start the nut or
bolt.
D. Observe that before the fastener seats, it devel
ops torque per the chart in figure 18 (if there is
any doubt, replace with a new prevailing torque
fastener of equal or greater strength).
E. Tighten the fastener to the torque specified in
the appropriate section of this manual.
2. Bolts and nuts that are rusty or damaged should be
replaced with new parts of equal or greater
strength.
METRIC-ENGLISH CONVERSION
For determining metric and english conversions, refer:
to figure 19.
DECIMAL AND METRIC
EQUIVALENTS
For determining decimal and metric equivalents, refer
to figure 20.
J1930 WORD
CONVERSION
Starting with the 1993 model year, General Motors
will be complying with the Society of Automotive Engi
neers (SAE) Recommended Practice J1930, J1930 is
an industry wide standard that was adopted into gov-
1
2
3
4
1. Grade 2 (GM 260-M)
2. Grade 5 (GM 280-M)
3. Grade 7 (GM 290-M)
4. Grade 8 (GM 300-M)
5. Manufacturer’s Identification
.
6. Nut Strength Identification
7. Identification Marks (Posidriv Screw Head)
VI263
Figure 17—Fastener Strength Markings
(Identification)
ernment regulations and requires certain electrical and
electronic components and systems be known by the
same nomenclature that have the same function. This
standard is also being applied to abbreviations and
acronyms. This standard is being used in all 1993 GM
service publications.
To make this standard work, some names and abbre
viations are being replaced with those.recommended by
the SAE standard.
For determining J1930 word conversions, refer to fig
ure 21.
Summary of Contents for C Series 1993
Page 1: ......
Page 12: ...OA 6 GENERAL INFORMATION Figure 11 Allison Transmission I D Location ...
Page 44: ...3B1A 2 POWER STEERING GEAR UNIT REPAIR Figure 1 710 Power Steering Gear ...
Page 62: ......
Page 75: ...3B3 2 POWER STEERING COMPONENTS TRW ROSS ...
Page 121: ...5H 16 AIR BRAKE VALVES Figure 21 Bendix Proportioning Relay Valve Components ...
Page 147: ...5J 10 AIR COMPRESSOR AND GOVERNOR 286 F9051 Figure 18 Bendix BX 2150 Compressor Components i ...
Page 204: ...MODEL 295 TBI UNIT 6C1 3 F7973 Figure 3 Model 295 TBL Unit ...
Page 251: ...6D4 6 37 MT STARTER MOTORS V3022 Figure 8 37 MT Components ...