Accumulator Piston Kit

Accumulator Piston Kit Partnr. 39741-42K Worn-out accumulator piston bores in listed Aisin AW 6-speed units allow pressurized transmission fluid to leak past the accumulator piston to the sump. These leaks can result in a flare at upshift, delayed engagement, poor line rise or clutch failure. The Sonnax accumulator piston kit 39741-42K will restore a worn accumulator bore and correct leakage problems. • Salvages valve bodies with severe accumulator bore wear • O-Ring seal improves piston response Symptoms: • Severe wear at accumulator bores • Low clutch oil pressure • Low TCC pressure • Low EPC pressure Cause: Since the length of the OE accumulator piston is short relative to its diameter, the effect of incidental side loading forces is increased. This characteristic, combined with relatively strong nested springs and the soft material of the valve body, results in severe wear. This extreme wear is noticeable in many low mileage units. Correction: Installing the Sonnax sleeve creates a new accumulator bore surface in severely worn valve bodies. Our improved sleeve design provides increased wear resistance and sealing. The kit comes with an assortment of custom-designed springs which allow you to duplicate and restore OE accumulator calibration and response.