Technical   Bulletin

Application:

 BMW    ZF 4HP22/24  1989-up                     Update

Subject:        Valve Body Gasket Change

       There has been an update in the 1989 -up ZF 4HP22/24 valve body gasket.

 This change involves the addition of two new holes, and the revision of two existing holes.

The new gasket # 1043-328080 will retrofit all previous 1998-up models .                                                                       Check your Rebuilt kits  of proper updates.

Application:

ZF 4 HP 22         A Clutch   update

We all know, the ZF 4HP22 transmission has a very high failure rate. And most rebuilders know, in most cases, the failure is the result of the input clutch oil leaking where the input- shaft sealing rings have worn into the inside of the stator support shaft.                                  A simple solution is to replace the metal-rings with Teflon rings. Like provided in the rebuilt kits.                                                                                                                                 

 Many rebuilders  oversee this is NOT the only leak the front pump housing can have. In same cases   the failure is the result of the input-clutch oil leaking at the area where the stator support shaft meets the stator-support body.                                                  

To check these areas, apply air pressure to the "A" clutch-apply port of the stator support while holding your finger over the exit port inside the stator shaft. A coat of oil will highlight the leak. If a leak is detected around the shaft, the stator shaft must be removed and replaced.