What the are fittings thread type and sizes on the Jaguar XJ6 steering rack, series 3 version? We need to make custom lines since the XJ6 now has a Corvette LS3 engine and Holley front accessories installed. Holley steering pump in on the driver side tucked under the alternator (you can see the Holley fill cap in the photo below). The Holley pump has an AN fitting for the high pressure line and a hose barb for the lower pressure side. We need the specs for the Jaguar rack threaded holes.



Steering pump HOLLEY fill cap in lower left.

 

Is the high pressure side 11/16-18 and the low pressure 5/8-18?

 

I believe the high pressure is 1/2-20 and the low side is 5/8-18. Can anyone confirm this for a SERIES 3 XJ6 steering rack?

 

It depends on which rack is in the car. Two kinds were used - Adwest or Alford & Alder. My 1985 XJ6 uses an Adwest rack and its fittings are all metric. The small fittings are 13mm and the large one is 16mm on the Adwest; I confirmed this three weeks ago when I rebuilt the rack, which was leaking like a sieve. The changeover was in 1981 if memory serves but another '85 XJ6 I had used SAE fittings.

Best to check them with a thread gauge.