Jaguar XJ x350 2003 2009 Wabco Air Suspension Compressor Piston Seal Installation 

Good instructions and a tip, if I may. I'm yet to dismantle one of those bad boys without snapping one or both of the T30 torx screws securing the cylinder head to the block - figures, with the OEM screws being mild steel and the body being Aluminum = AlO3 (Aluminium Oxide) and or/corrosion. So, when you snap one of the screws, and a part of iit is stuck in the cylinder block, simple cut the remaining part of the stid flush with the face of block, being very careful not to damage the mating surface, then drill the leftover part through with a 4mm drill bit - I recommend the toughened Dewalt steel bits for this task. Be patent, and make sure the hall is centered well. Once done, simply die the hall with the supplied die bit and you're done.

Got an x350 with one of these pumps. The suspension jacks itself right up solid when you drive it. Can let the rear back down with the diagnostic but the front won't. I've read there's an exhaust solenoid on the pump that might be seized? Likely cause? If you don't let the front down by loosening the pipes to let pressure out to normal height soon as you start it it jacks the back end up to match. If you do let the front down its fine and stays where it should be until you drive it... then its back up on stilts and rock solid. Any suggestions before I scrap it!? 🤣