When installed, the head of the retainer for the secondary pulley/pressure regulator valve train stands proud of the valve body casting. The retainer must be removed prior to mounting the casting on the VB-FIX to allow the casting to sit flat on the fixture. Sonnax recommends removal of the complete secondary pulley/pressure regulator valve train before mounting the casting on the VB-FIX.
In Jatco/Nissan JF015E (RE0F11A) units, the lockup control valve operates under the direct command of the lockup control solenoid routed through a select switching valve and is also influenced via apply and release feedback balance passages. A worn bore, valve spool(s) or plunger valve assembly can cause loss of critical pressure to the sump, lube circuit, or directly into apply or release passages resulting in jerking on coastdown, harsh engagement, and high engine RPM due to no lockup.
Reconditioning the bore and installing Sonnax oversized lockup control and plunger valve kit 33741F-09K restores optimal oil pressure management within the TC clutch apply/release circuits.
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.