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Tech Article

Audi C5 A6 Quattro 4.2 V8 Transmission ZF 5HP-24A vs. 5HP-24 Oil Pump Variations

Last Updated: 09/24/2017
Parts Group: Transmission oil pump
These last few days, I have been focusing on the oil pump of the ZF 5HP-24A transmission, the all-wheel drive version as used in the turn-of-the-century Audi A6 and A8 Quattro. One of the first steps in disassembling the transmission is the removal of the oil pump. In the process, sometimes things go wrong, so I have been curious as to whether or not some of the oil pump parts in the ZF 5HP-24 transmission, the rear wheel drive version as used in BMW, Jaguar and Range Rover, might be identical, so that if I break an Audi part (hard to find), I can swap in a good used part from a BMW (easy to find).

Specific to the transmission oil pumps, I have spent some time comparing the ZF parts catalog for the ZF 5HP-24 (rear-wheel drive) to the catalog for the ZF 5HP-24A (the all-wheel drive Audi version).

Going by both the diagrams and the part numbers, I conclude that there’s very little that these two respective oil pump designs have in common as to the large components, including where they feature in the grand scheme of things. On the Audi model, the entire oil pump is inside the transmission case, whereas on the rear-wheel-drive version, the outside of the oil pump is exposed to the elements, and is sandwiched between the bell-housing and the transmission case. As such, the rear-wheel drive version has an external breather, and cover.

As to the small components such as the needle bearing, o-ring, seals, snap ring, piston rings and screws, these have a huge overlap, as in: many identical parts are used in both types of transmission.
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