March 21, 2022
The secondary pressure regulator valve on the Aisin Seiki AS66RC can often wear out. Deterioration at the balance spool end allows for fluid loss resulting in high line pressure, harsh shifts and overheating due to reduced cooler/converter flow. Wear in the boost sleeve can result in converter pressure bleeding into the EPC.
Restore proper hydraulic integrity of the circuit by reconditioning the bore and installing Sonnax oversized secondary pressure regulator valve kit 122740-24K.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.