Wear at the overlap control valve bore prevents proper exhaust of the disengaging clutch pressure, altering the precise timing required in the clutch-to-clutch shift transition.
The improved Sonnax oversized overlap control valve kit restores hydraulic sealing and valve timing when installed in a refurbished bore.
The Mercedes 722.6 transmission uses clutch-to-clutch transitioning during shifts, so timing is very critical to prevent shift complaints like flares or bind-ups. The overlap control valves, controlled by EPC (modulated pressure) and shift valve pressure, are used to gradually reduce the pressure to the disengaging clutch. Bore wear at the overlap control valve or the plunger valve sleeve can prevent proper clutch exhaust and disrupt the critical clutch-to-clutch timing.
Sonnax oversized 1-2/4-5 overlap control valve kit 68942-19K has slightly longer critical spool diameters and optimized annular groove placement for better hydraulic sealing and to prevent future bore wear.
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.
December 30, 2013
Topics: Vacuum Testing Vacuum Test Guides Transmission Mercedes 722.6 TransmissionRead Now
Contact a Sonnax Parts Distributor.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-HG.