Printpartsummary
Symptoms:
  • Burnt transmission components
  • Cooler check valve spring breakage
  • Cooler drainback
  • Delayed engagement
  • No cooler flow
Cause:

Improper spring and control of spring alignment.

Correction:

The Sonnax end plug with a centering nub keeps the redesigned spring centered.

RE4F04B

Cooler Check Valve Kit

Part No.

63940-07K

Cooler Check Valve Kit
  • 63940-07k_combo

  • Cooler Check Valve Kit

Small_63940-07k_combo Small_63940-07k

RE4F04B

Cooler Check Valve Kit

Part No. 63940-07K

  • Spring
  • End Plug

Complaint:

  • Burnt transmission components
  • Cooler check valve spring breakage
  • Cooler drainback
  • Delayed engagement
  • No cooler flow

Cause:

Improper spring and control of spring alignment.


Correction:

The Sonnax end plug with a centering nub keeps the redesigned spring centered.

The OE cooler check valve spring does not remain centered on the end plug. When the valve strokes, the valve stem can contact the spring and pinch the end coils against the end plug, breaking them off. This will prevent proper function of the cooler check valve, and lead to reduced cooler flow or drainback conditions. Additionally, the broken spring parts can migrate through the rest of the valve body, potentially lodging in other valves. Sonnax has developed a kit with a modified end plug and spring. The end plug has a nub at the inboard end, allowing the spring to stay properly centered on both ends. The modified spring works with the end plug to re-establish the OE operating forces.

  • Modified end plug self-centers the spring.
  • Modified spring re-establishes correct operating pressures.
  • Drop-in-place solution salvages the valve body

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Contact a Sonnax Distributor to purchase this part.