Sorry in advance if anyone has answered this question before. The Jag I bought is a higher mileage car (150k), and will one day need to be gone through. Does anyone know of a place in the states that sells rebuild kits for the 4.2 XJR? I am trying to have whatever spare parts in my garage that I can for when that day comes. I am ordering the Eaton rebuild kit this week, and some other odds and ends.
i really appreciate your help on these forums in the short time I’ve been on here.

 

How solid is engine now? Oil consumption, leaks, smoke, or noises?
Maintenance is key. Oil changes, flush power steering, brakes, differential, and radiator. Also change oil in transmission and blower.
Try to get as much as possible out of existing engine. There is a reason there are no rebuild kits. A rebuild will require mostly dealer parts. Bring Platinum card. Labor will be high.
A much cheaper option is find an engine. Any import junk yard can see what is out there. Wrecks are best bet. A solid used engine might be the same as labor cost on a rebuild.
Try to get another 100K out of it. 50K will be easy if it is fine now.

 

the engine is running great now. No leaks, doesn’t burn oil or smoke, no knocking or ticks. Oil still looks clean after a 3,000 mile oil change

 

I always feel if I did not do the maintenance it did not happen.
When I purchased my XJR at right under 100K it had been neglected.
1. Oil was black.
2. Power steering fluid was black.
3. Brake fluid was green - black.
4. Differential looked okay.
5. Supercharger oil looked okay.

I think all but the engine oil was original at 10 years and 99,000 miles. Flushed the transmission and replaced the pan/filter. After reading up on aftermarket pans I may replace again with a ZF pan. That video is pretty convincing.
Scan your air/fuel ratios. Lean is leaks. Rich is O2 sensors most likely.
One scary item is the air struts. Simple is replace with coil-overs. I am using rebuild units to keep air ride and adjustable dampening. Money.
Another money pit is the control arms and other rubber suspension parts. They seem to deteriorate depending on climate. Texas is real hard on them. Canada and Alaska they hold up. I assume in Northern Europe they last.
I LOVE my XJR. Hope to get 10 more years.

 

These motors are said to do 300,000 to 400,000 miles with proper maintenance.

 

No, they don't last in Europe !!
Reason I went for an XE was I was absolutely fed-up with constant suspension work. OK the depreciation of my XE is probably costing me far more than the suspension work, but at least I don't have to keep trekking out to a local Jaguar specialist 12 miles away and come back on a freezing cold bus !

 

Spray the rubber with 303 Protectant. Works on suspension, door seals, door panels, and dash. Adds years of life. I spray the suspension bits at every oil change.
Wing rider, I hope you are right on the motor going that long.

 

I hope so too Panelhead, both mine run great.
Use no oil between changes, with over a hundred thousand on each.
Have read of Crown Vic's going 500,000 miles
The 303 spray is good stuff, marine use was first i heard of it.
Rubber, & plastic on boats really takes a beating from the sun