- 2nd Gear starts
- Blued converter
- Delayed engagement
- Erratic line pressure
- Harsh Reverse
- High governor pressure
- No TV control
- Overheated converter
- Pressure over 230
Bore wear at the pressure regulator valve on high-mileage vehicles allows orificed balance line pressure to leak to the sump and affects converter feed and line pressure control.
This replacement pressure regulator valve incorporates a PTFE seal and end plug with O-ring to prevent balance oil pressure leakage.
Pressure Regulator Valve Kit
- PTFE Seal Ring
- nd Plug
- Retaining Ring
High-mileage vehicles with a THM 200/200C often experience poor line pressure control due to a worn pressure regulator bore. This can result in high cooler pressure as well as converter and/or friction element failure. The hardened steel valve continuously oscillates within the cast-iron pump bore, resulting in wear. Orificed line/balance pressure is then allowed to leak past the valve and exhaust to the sump. This prevents the pressure regulator valve from staying in its normal regulating position. Sonnax offers a pressure regulator valve kit 65912-01K that eliminates these problems.
- The Sonnax pressure regulator valve has been modified to incorporate a PTFE seal ring that properly separates the orifice line from the pump suction, preventing cross leakage.
- The kit includes an O-ringed end plug to assure proper back pressure to the pressure regulator valve.
- A replacement retaining clip is included.
- Kit eliminates the need to replace the pump casting to ensure pressure control.