 | |
| Illustration 1 | g00279776 |
Location of torque converter relief valves (1) Torque converter inlet relief valve. (2) Torque converter outlet relief valve. | |
 | |
| Illustration 2 | g00279780 |
Inlet relief valve (1) Inlet relief valve. (3) Passage to torque converter case reservoir. (4) Spool. (5) Inlet passage. (6) Shims. | |
 | |
| Illustration 3 | g00279801 |
Outlet relief valve (2) Outlet relief valve. (7) Shims. (8) Inlet passage. (9) Spool. (10) Outlet passage to torque converter outlet screen. | |
Inlet relief valve (1) and outlet relief valve (2) are installed on the outside of the torque converter case. The operation of both valves is identical.
Inlet relief valve (1) controls the maximum pressure of the oil that is flowing to the torque converter. The oil supply comes from the torque converter charging section of the oil pump. The oil comes through the oil filter of the torque converter charging section. The inlet relief valve ensures that the maximum oil pressure to the torque converter does not exceed approximately 930 ± 35 kPa (135 ± 5 psi).
| NOTICE |
|---|
With cold oil, inlet pressure going to the torque converter must not exceed 930 kPa (135 psi). Pressure that is greater than the maximum setting will damage the torque converter. |
Outlet relief valve (2) controls the minimum pressure of the oil that is inside the torque converter. Oil comes from the torque converter through passage (8). The oil then flows past spool (9). The oil then exits through passage (10). The outlet oil goes through the torque converter outlet screen. At the diverter valve, oil is sent to the front brakes. If the diverter valve is activated, the oil is sent through the oil cooler before going to the front brakes. Oil from the front brakes returns to the hydraulic tank.
The outlet relief valve ensures that the pressure of the oil that exits the torque converter does not exceed 550 kPa (80 psi). Some of the oil from the outlet relief valve goes to the pump drive for lubrication.