Clutch pressure loss around the adjuster
Sonnax spring adjusters with O-rings eliminate the clutch oil loss, improving clutch application and shift quality.
In Aisin AW TF-60SN, TF-80SC and TF-81SC applications the oil circuit between the clutch control valve and the adjuster is clutch apply oil. The clutch apply oil opposes the solenoid oil and slows the stroke of the valve in response to clutch fill rate. When the adjuster leaks, both clutch oil and fill rate are affected. Installing the Sonnax spring adjuster kit 15741-48K results in shorter, firmer shifts and less variance across temperature range.
Vacuum testing over the adjuster spring fails to hold 12 in-Hg. Use Sonnax test plate to cover and seal each of the four outlined areas in each valve body to perform a vacuum test.
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