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Symptoms:
  • Low clutch oil pressure
  • Low EPC pressure
  • Low TCC pressure
  • Severe wear at accumulator bores
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.

TF-80SC

Accumulator Piston Kit

Part No.

39741-42K

Accumulator Piston Kit
  • 39741-42k_combo

  • Accumulator Piston Kit

Small_39741-42k_combo Small_39741-42k

TF-80SC

Accumulator Piston Kit

Part No. 39741-42K

  • Piston
  • Sleeve
  • O-Ring
  • Springs (4) Selective

Complaint:

  • Low clutch oil pressure
  • Low EPC pressure
  • Low TCC pressure
  • Severe wear at accumulator bores

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.

Worn-out Aisin AWTF-80SC accumulator piston bores 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 linerise or clutch failure. The Sonnax accumulator piston and sleeve repair 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
  • No special tools required
OE SPRINGSSONNAX SPRINGS
Paint ColorDimensionsPaint ColorDimensions
Yellow O.D.= .618" (15.7mm) Yellow O.D.= .520" (13.21mm)
Wire Dia. = .078" (1.98mm) Wire Dia. = .068" (1.73mm)
Yellow O.D.= .412" (10.46mm) Yellow O.D.= .345" (8.76mm)
Wire Dia. = .054" (1.37mm) Wire Dia. = .047" (1.19mm)
No Paint O.D.= .632" (16.05mm) No Paint O.D.= .523" (13.28mm)
Wire Dia. = .083" (2.11mm) Wire Dia. = .070"(1.78mm)
Gray/Blue O.D.= .429" (10.90mm) Gray/Blue O.D.= .336" (8.53mm)
Wire Dia. = .063" (1.60mm) Wire Dia. = .051" (1.30mm)
NOTE:

This kit can be modified to fit other variations of the AW 6-speed applications by modifying the sleeve length. Can be used in 5 locations.

Related Parts

You need this if...

The accumulator bore and piston wear is severe enough that Sonnax accumulator piston kit 15741-14K will not function in the worn 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 Aisin AW TF-80SC
Contact a Sonnax Distributor to purchase this part.