Riviera V6-231 3.8L Turbo VIN 8 4-bbl (1983)
Wheels: All Technical Service Bulletins
Wheels - New Steel Replacements
Model Year 1983
Bulletin No. 83-212
File in Group
30
Number
12
Date
Dec. '83
SUBJECT:
"TC" Steel Wheel
MODELS AFFECTED: 1983 Riviera
FIGURE 1 - NEW STEEL WHEEL (W/O FLANGED PILOT HOLE
FIGURE 2 - EXISTING STEEL WHEEL (W/FLANGED PILOT HOLE
In May, 1983, a new steel wheel, code "TC", Part No. 9590967 (Figure 1), went into production on 1983 Rivieras. The new wheel may be used as a
service replacement for existing steel wheels back to 1979 Rivieras.
This wheel incorporates a new manufacturing process in which the five (5) bolt holes and the pilot hole are machined at the same. Use of this process is
to minimize radial wheel runout.
Some difficulty may be encountered when attempting to balance the first of the new production steel wheels. These wheels, carrying a disc code "C"
(March) stamped near the bolt circle, have a pilot hole design which interferes with the service balancer wheel mounting cones when the wheel is
mounted from the back side. Accordingly, all wheels date stamped "C" should be mounted to a wheel balance machine with the wheel front side to the
mounting cone. If mounted from the back side, the "C" stamped wheels may be off by about one ounce of static balance.
Wheels with a date stamp "E" (May) and later, may be balanced in a conventional manner. No wheels date stamped "D" (April) were built.
