Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • 1-2 Bump
  • 1-2 Flare
  • 1-2 Harsh
  • 4-5 Bump
  • 4-5 Flare
  • 4-5 Harsh
  • Slipping
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 and valve timing when installed in a refurbished bore.

Tool Required VB-FIX Required

722.6

Oversized 1-2/4-5 Overlap Control Valve Kit

Part No.

68942-19K

Oversized 1-2/4-5 Overlap Control Valve Kit
  • 68942-19k_combo

  • Oversized 1-2/4-5 Overlap Control Valve Kit

Small_68942-19k_combo Small_68942-19k

722.6

Oversized 1-2/4-5 Overlap Control Valve Kit

Part No. 68942-19K

  • Plunger Valve
  • Plunger Sleeve
  • Overlap Control Valve
  • Spring
  • O-Ring

Complaint:

  • 1-2 Bump
  • 1-2 Flare
  • 1-2 Harsh
  • 4-5 Bump
  • 4-5 Flare
  • 4-5 Harsh
  • Slipping

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 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.

  • 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

Required Tools

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-HG.

  • Test Locations

Click here to view PDF if instructions do not appear below.

It appears you don't have a PDF plugin for this browser. Click here to view the PDF file.

Valve Body Layouts

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.

Valve Body Layout Mercedes 722.6

Related Tech Articles

Sonnax

Mercedes 722.6 Vacuum Test Guide

Contact a Sonnax Distributor to purchase this part.