Full overhaul gasket and seal package for the ZF 8HP70 and 8HP75 eight-speed used in BMW 3/5/6/7 Series, X3 X5 X6, Jaguar XF XJ XK and Discovery LR3.
Searching for a reseal kit for a BMW 535i, 750i, X5 or Jaguar XJ eight-speed that is dripping fluid, or closing up an 8HP70 you already have apart? This is the seal side of an 8HP70 and 8HP75 overhaul: case and pan gaskets, shaft and drum lip seals, the shaft sealing rings and the O-ring package. It does not contain clutch frictions or steel plates. Buy it when the clutch packs measure good and the job is about leaks and pressure loss, or pair it with separate frictions and steels when the packs are burnt.
Every one of the 8HP70's five shift elements is hydraulically applied. The three rotating clutches get their oil through sealing rings that ride in grooves on the input shaft, the drums and the case hub, and each piston has its own inner and outer seal. On the outside, the case is closed by the pan gasket, the bell housing and output lip seals, and the plastic connector sleeve where the mechatronic harness passes through the case. Old rubber shrinks and hardens with heat cycles, so a high-mileage unit tends to leak from several places at once and lose apply pressure internally through worn sealing rings. A leaking mechatronic sleeve is one of the best-known 8HP faults; fluid wicks past it and the unit runs low, which then shows up as harsh shifts and slip.
Clean the case, drive it, and trace the leak to its highest wet point before ordering. Not every wet 8HP needs an internal reseal. BMW published bulletin SI B24 02 15 for fluid loss at the transmission-side cooler line connections on N20, N26 and N55 cars, which is an external fitting repair. Set the level using ZF's procedure with the engine running and the fluid warm, not by eye. If the pan holds lining debris as well as dark fluid, the clutches are worn too and you need a kit with frictions. Our BMW 8-speed common problems guide covers the cooler line and sleeve leaks, and the BMW 8-speed shift problems guide explains how low fluid shows up as shift faults.
This kit is listed for the ZF 8HP70 and 8HP75 in BMW 3 Series, 5 Series and 5 GT, 6 Series, 7 Series, X3, X5 and X6 (rear-drive and xDrive, 2.0L through 4.4L); Jaguar XF, XJ and XK; Land Rover Range Rover Sport 4.4L and Discovery; Aston Martin DB9 and DBS 5.9L; and Rolls-Royce Ghost 6.8L. The application list leans toward the early BMW and Jaguar years, and the Discovery entry is labeled LR3, so confirm your vehicle actually has the 8-speed. The 8HP45, 8HP70 and 8HP90 share a design but not every seal diameter, so read the code on the case tag before ordering, or send us your year and VIN. Browse the full ZF 8HP parts collection for matching parts.
Work clean: plug the cooler ports, keep the mechatronic covered, and do not let lint near the valve body. Size each sealing ring to its groove before installing; cut-type rings must be seated without twisting, and they need a light coat of fluid or assembly gel so they do not cut on the bore. Lube every lip seal before it slides over a shaft spline and drive it in square with a proper installer. Replace the mechatronic connector sleeve and its O-rings every time the valve body comes out.
If the seals are going in because the unit is apart anyway, plan the hard parts now. A tired solenoid pack is easy to replace at this stage with the 8HP70 solenoid kit, and if the frictions are burnt, step up to the ZF 8HP70 master rebuild kit with frictions instead. Refill with ZF Lifeguard 8 through the fill plug and set the level hot with the engine idling; a fully drained unit takes far more than a pan service.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is gaskets, lip seals, sealing rings and O-rings only. Order frictions and steels separately, or choose a master kit with frictions if the packs are worn.
It replaces the seals that commonly leak on a teardown, including the pan gasket and lip seals. If the leak is at the cooler line fittings, that is an external repair covered by BMW bulletin SI B24 02 15 and does not need this kit.
The kit carries the overhaul O-ring package. Compare the sleeve and its O-rings against your old parts before assembly, and replace the sleeve whenever the valve body comes out.
It is listed for the 8HP70 and 8HP75. The 8HP45 and 8HP90 share the design but not every seal size, so match the code on your case tag.
ZF Lifeguard 8, filled through the case plug and leveled with the engine running and the fluid between 30 and 50 C.
