Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Shift concerns
  • UD/B3 brake clutches burned
Cause:

The B3 orifice control valve often sticks in the casting bore, preventing proper stroking of the valve and flow control to the UD/B3 brake.

Correction:

Refurbish the valve bore and install the Sonnax oversized B3 orifice control valve and spring to prevent future sticking issues.

Tool Required VB-FIX Required

U151E, U151F, U250E

Oversized B3 Orifice Control Valve Kit

Part No.

27741-16K

Oversized B3 Orifice Control Valve Kit
  • 27741-16k_combo

  • Oversized B3 Orifice Control Valve Kit

Small_27741-16k_combo Small_27741-16k

U151E, U151F, U250E

Oversized B3 Orifice Control Valve Kit

Part No. 27741-16K

  • Valve
  • Spring

Complaint:

  • Shift concerns
  • UD/B3 brake clutches burned

Cause:

The B3 orifice control valve often sticks in the casting bore, preventing proper stroking of the valve and flow control to the UD/B3 brake.


Correction:

Refurbish the valve bore and install the Sonnax oversized B3 orifice control valve and spring to prevent future sticking issues.

In U151E/F, U250E units, the B3 orifice control valve and spring are biased by SLT solenoid (torque signal) pressure to control the UD/B3 brake. Regulated line pressure is routed from the 4-5 shift valve through the B3 orifice control valve to apply the UD/B3 brake. When this valve sticks, flow will diminish or no flow will go to the brake, resulting in burnt clutches or shift complaints.

  • Hard-coat anodized aluminum valve maintains consistent bore-to-valve clearance at temperature variations, which helps prevent seizing of the valve
  • Valve front spool has been greatly lengthened to provide more stability in the bore
  • Annular grooves provide better valve centering in the bore and keep the contact area lubricated to prevent seizure

Required Tools

You need this if...

The OE valve is stuck in the bore.

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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 Toyota U151E/F, U250E

Related Tech Articles

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