December 30, 2013
Symptoms:
- 3-4 Flare
- 3-4 Bump
- 3-4 Harsh
- Slipping gears
Cause:
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.Correction:
The improved Sonnax oversized overlap control valve kit restores hydraulic sealing integrity and valve timing when installed in a refurbished bore.Warning:
Required tool kit F-68942-TL31 is no longer in production. Check with your distributor for availability.
722.6
Oversized 3-4 Overlap Control Valve Kit
Part No. 68942-31K
-
Tooling:
- F-68942-TL31
- VB-FIX
You need this if... View Instructions Find a Distributor
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.
Sonnax oversized 3-4 overlap control valve kit 68942-31K has slightly longer critical spool diameters and optimized annual groove placement for better hydraulic sealing.
- The wear-resistant plunger sleeve has an added O-ring to provide additional positive sealing in the bore
- The replacement spring and valve ratios maintain OE shift pressures for proper timing and function
- Overlap Control Valve
- Plunger Valve & Sleeve Assembly
- Spring
- O-Ring
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.
Mercedes 722.6 Valve Body Layout
You need this if...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
