What happens if your JAG overheats too much?
The problem with the kind of overheating you describe (the long wait for boiling to quiet down and coolant loss, etc) is that there is a risk for cylinder head warping (or simply a gasket failure) or (as I assume) contribution to between-bore cracks in the block.
What causes a Jaguar V-12 engine to overheat?
It has been Kirby Palm’s impression that faulty ignition timing is a major contributor to Jaguar’s reputation for overheating: If the timing of the V-12 is retarded it will overheat BIG TIME. This is supposedly true of most cars but I have never seen it happen the way it happens on the H.E. V-12 5.3 litre engine.
Where is the overflow tank cap on a Jaguar XJ6?
For a Series III XJ6, replace the header tank cap with a flat non-venting cap and the overflow tank cap with a 15 lb pressure cap (The header tank is located on the front of the coolent rail on the top, intake side of the engine, the overflow tank is on the fender wall).
What’s the boiling point of coolant in a Jaguar?
The same goes for your cooling system. When your system operates at it’s rated 15 psi pressure (XJ6 Series III) the boiling point of the coolant circulating inside of your head and block is much higher than if your system is operating at ambient pressure.
It has been Kirby Palm’s impression that faulty ignition timing is a major contributor to Jaguar’s reputation for overheating: If the timing of the V-12 is retarded it will overheat BIG TIME. This is supposedly true of most cars but I have never seen it happen the way it happens on the H.E. V-12 5.3 litre engine.
For a Series III XJ6, replace the header tank cap with a flat non-venting cap and the overflow tank cap with a 15 lb pressure cap (The header tank is located on the front of the coolent rail on the top, intake side of the engine, the overflow tank is on the fender wall).
What should I do if my Jaguar overheats?
A hard or expired rubber seal on the radiator caps or an under-rated (3 lb or 8 lb) pressure cap on the overflow tank.
What kind of transmission does a Jaguar XJ6 have?
Jaguar XJ6 Service and Repair Manual 3261 Jaguar XJ6 Models covered Jaguar XJ6 models with 3.2 litre (3239 cc), 3.6 litre (3590 cc) & 4.0 litre (3980 cc) six-cylinder in-line dohc petrol engines and automatic transmission