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Te T echnical S ervice In Infformation AUDI/PORCHE/SAAB/VOLVO/VW AISIN 09G, 09D, TF80, AW 55-50SN WITH VARIOUS SHIFT COMPLAINTS COMPLAINT: Before or after after overhaul ul,, ve vehicl hicle es equippe equipped with with Aisi sin n transm transmiss ssiions may exhi exhibit various
shift complaints such as harsh 2-3, 3-5 and N-R, or a harsh N-D and 5-4, or a harsh 3-4 and/or coast coast downshi downshift clun cl unks. ks. CAUSE:
The cause may be a lo The los ss of lu lub be pressure due to worn pressure regula lattor valv lve e bores (primary/secondary), worn bushings, excessive end play and/or failed bonded balance pistons. pi stons. The K 1, K2 K 2 and K3 K3 clutch clutch assembl bliies are are equi quippe pped with with thes these e bonded counte counterr ballan ba ance ce pi pistons. stons. Usi Using ng K3 K3 as as an an exampl ple e from from an 09G transm transmissi ssion on (fi (figure gures s 1 and 2), 2), the ballan ba ance ce pi piston ston functi unction on is is to hol hold d "counter" or "ba "back" ck" pres pressure sure on the the K 3 appl pply y piston. piston. The Th e bala lan nce pis istton is fe fed d fr fro om the lu lub be cir irc cuit it,, and it its s purpose is to provid ide e a small amount of pres pressure sure to assi assist st the releas ase e of the K 3 clutch. clutch. It I t also also acts as an accumul ulator ator during duri ng appl ppliication of the K 3 clutch clutch (fi (figure gures s 3 and 4). 4). The bonded piston piston has has threenotches where the retaining snap ring is located allowing a controlled leak of this pressure, and when the bonded rubber is worn this will allow a larger volume of pressure loss which can cause cau se the ha harsh rsh appl appliications. The T he K 1 can cause cause a harsh harsh N-D an and d 5-4 shif shift, the K2 K2 can can cause cau se a harsh 3-4 shif shift and and the K 3 can can cause cause a harsh 2-3, 3-5 and N-R N-R shi shifft.
CORRECTION: MostA isi sin n Seiki Seiki tra transm nsmissions utili util ize apri prim mary and and second conda ary pressure pressurere regulator gulator val valve from
which lube which lubeori origi gina nate tes s and and has its its pressure pressurecontrol control.. Shoul Should d ei either one of theseval valves veswear into into theboreit itcandrop droplube lubepres pressure sure(fi (figure5). Check lubepres pressure sure with with a pressure pressurega gauge uge. The T here should be approxi approxim mately 6 to 10 psi psi of lube during duri ng operati rating ng tem temperature. I f pres pressure sure runs runs close close to to zero psi, psi, these regul gulator ator valve valve bores bores will need to be inspected. Bushing wear and loose end play can also cause a loss of lube pressu pre ssure re in addi additi tion on to fail failed counte counterr bal balance bon bonde ded pistons. pistons. Al A ll of whi which ch wil will need to be either repair repaire ed or repl place aced restori storing ngci circui rcuitt inte integri grity. ty. Refer to fi figu gure re 6for theTF80 80-- SC pre pressu ssure re tap loca locati tions ons Refer to fi figu gure re 7for theTF81 81--SC pre pressu ssure re tap loca locati tions ons Refer to fi figu gure re 8for theTF60 60--SN pre pressu ssure re tap taploca ocati tions ons Refer to fi figu gure re 9for theTR60 60--SN pre press ssure ureta tap p loca locati tions ons Referto figu gure re10 10for fortheAW AW55 55--50 50SN SN pre pressu ssure retaploca locati tions ons
12-12 AUTOMA AUT OMATIC TIC TRANSMI TR ANSMISS SSION ION SERVICE SE RVICE GROUP
