September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- Slips & flares
- Harsh upshifts
- Bind-up
- Harsh Reverse
- TCC cycling
- TCC slip
- Excess Reverse pressure & distorted housings
- Low cooler flow
- Overheating
Cause:
Excessive solenoid pressure is caused by line pressure side-loading the steel solenoid modulator valve and the continuous oscillation of the valve, which wears the cast aluminum bore.Correction:
Sonnax solenoid modulator valve and high-grade aluminum sleeve allows the bore to be refurbished, and prevents side-loading of the valve and future wear.U140E, U140F, U240E, U241E
Solenoid Modulator Valve Kit
Part No. 57917E-13K
-
Tooling:
- F-57917E-TL13
- VB-FIX
You need this if... View Instructions Find a Distributor
In Toyota/Lexus U140E, U140F, U240E and U241E units, the steel OE solenoid modulator valve is prone to side-loading in the bore. This side-loading action, combined with repeated oscillation of the valve, prematurely wears the cast aluminum bore causing shift and TCC concerns. Sonnax solenoid modulator valve kit 57917E-13K restores normal solenoid supply pressures.
- High-grade aluminum sleeve resists wear and provides porting to prevent valve side-loading
- Hardcoat anodized aluminum valve combats premature wear, incorporates annular grooves to prevent side-loading
- Replacement spring resets regulated pressure to OE specification
- Valve
- Sleeve
- Spring
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.
Toyota/Lexus U140E/F, U240E, U241E Valve Body Layout
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January 25, 2023
Uncovering the Root Cause of Pressure & Complaints – The Critical Role of Solenoid Modulator & AFL Valves
Maura Stafford
