Seville V8-273 4.5L (1989)
will allow too much lubrication fluid to leak into the bottom pan. Refer to Cadillac Service Bulletin T-88-101 in Group 7.
7. FINAL DRIVE
The final drive sun gear lube groove must face toward the parking gear to allow adequate lubrication flow to the final drive pinions. The final drive sun
gear shaft has lubrication holes in the shaft that feed fluid into the step in the sun gear, then through the two slots in the parking gear to the final drive
pinions. If the final drive sun gear was installed backward, the holes in the final drive sun gear shaft would be blocked, not allovang fluid to lubricate the
final drive pinions.
Final drive end play should be checked during any overhaul. Excessive end play would allow the final drive sun gear to move away from the thrust
bearing in the final drive and allow too much lube fluid to leak out from the final drive sun gear shaft.
8. LUBE OIL PIPES
Check lube oil pipes for correct installation and any damage (plastic cracked, pipes bent, etc.). Ensure the lube oil pipe retainer is in the proper position.
A mispositioned or damaged component will leak lubrication fluid into the bottom pan instead of directing the fluid to the center gearbox area. While
bolting down the accumulator cover, make sure the lube oil pipe retainer is not cocked.
9. THERMO ELEMENT
An incorrect thermo element height will cause the fluid level to be inaccurate (either too low or too high) when the fluid is up to operating temperatures.
Too low a fluid level will cause air to be sucked into the filter, and too high a level will cause fluid foaming due to churning. This will cause many
durability concerns including damage to the center of the gearbox. Check the height with the thermo element height setting tool, J 34094-A.
10.
TRANSAXLE OIL COOLER AND LINES
Blockage of the transaxle oil cooler and/or lines prevent lubrication fluid from reaching the center gearbox area. A cooler flow test should be performed:
correct flow is two quarts of fluid per 30 seconds. Also, the cooler and lines should be flushed. Refer to the appropriate Service Information Manual,
Section 7A, for cooler flushing and flow test procedures.
11.
LINE PRESSURE
Lubrication fluid flow is proportional with line pressures. If the line pressure is below specification, then lubrication fluid flow would be inadequate.
Check the line pressure as outlined in the Service Information Manual and reference Cadillac Service Bulletin T-87-33A in Group 7 for details about
vacuum modulator diagnosis.
12.
CONVERTER CLUTCH REGULATOR VALVE
Check the converter clutch regulator valve for proper operation, binding, sediment, or damage, etc. This valve controls the flow of lubrication - when the
Viscous Converter Clutch (VCC) is applied, main line lubrication fluid from the pump pressure regulator is routed past the torque converter directly to
the cooler. When VCC is not applied, the fluid is routed through the torque converter, then to the cooler. If the valve is damaged, a new valve is included
in service package P/N 8646934. Use only the converter clutch regulator valve from this package.
