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.
How much power does a Jaguar XJS he V12 have?
This engine produces a maximum power of 295 PS (291 bhp – 217 kW) at 5500 rpm and a maximum torque of 431 Nm (317 lb.ft) at 3000 rpm. The power is transmitted to the road by the rear wheel drive (RWD) with a 3 speed Automatic gearbox.
When did the Jaguar V12 engine come out?
The Jaguar V12 was designed in the late 1960s by a team of engineers as highly regarded as any in the motor industry at that time – indeed many of them had been involved in producing the succession of World Championship winning Coventry Climax racing engines only a few years before.
When did the first Jaguar XJS come out?
It is the pioneer to an iconic Jaguar series that had its debut in September f 1975. Coupled with a V12 engine and powerful transmission, great things were expected of this model.
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.
What are the problems with a Jaguar V12?
The biggest problem with this comes from old rubber hoses perishing, the second biggest problem comes from people re-assembling the system incorrectly. One of the clever things the system does is warm the engine up quickly, and its huge amount of coolant.
What kind of engine does a Jaguar XJ12 have?
The simplest incarnation was in the carburettor fed E Type and XJ12 models, but the engine was designed for fuel injection from the start, and as soon as a suitable system was available it was fitted to the XJ12, the XJ-S was injected from the start.
It is the pioneer to an iconic Jaguar series that had its debut in September f 1975. Coupled with a V12 engine and powerful transmission, great things were expected of this model.
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’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.
What’s the temperature on a JAG at cruising speed?
When driving long distances at reasonable cruising speed (ca. 100-110 km/h) the engine temperature goes up to the red area on the temperature gauge. When I drove the car around Perth it always stayed on the cool side, staying at the end of the white band of the temperature gauge, not even getting up to “normal.”
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.
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.
When driving long distances at reasonable cruising speed (ca. 100-110 km/h) the engine temperature goes up to the red area on the temperature gauge. When I drove the car around Perth it always stayed on the cool side, staying at the end of the white band of the temperature gauge, not even getting up to “normal.”
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).
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 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 kind of car is 1992 Jaguar XJS?
1992 Jaguar XJS V12 Concours-level preservation quality beyond belief 100% original Flamenco Red metallic paint & Creme leather interior 1 of 553 Coupes built in 1992 5.3-liter V12 engine The final… More Info › 1996 Jaguar XJS Convertible.
What kind of engine does a Jaguar XJS have?
Seller s Description: 1995 Jaguar XJS convertible 2+2, 4.0L engine, 22,897 miles. Classy sapphire blue with tan leather interior. Add-ons include… More This 1989 Jaguar XJS Coupe for sale has a 5.3 Liter Fuel Injected V12, 3 Speed Automatic Transmission, Only 41,183 Original Miles, Clean Carfax… More
What kind of paint does a Jaguar XJ have?
1986 Jaguar XJS V12 Coupe, only 69,000 miles, totally rust free, stunning Sebring Red paint, perfect Biscuit leather, excellent chrome, smooth and powerful 5.3… More 1994 Jaguar XJ-S ConvertibleAn XJS as a convertible is a carwhich is not so easy to imitate.Noble walnut wood dashboard and real leather interioraccentuate… More
What kind of engine does a Jaguar XJ6 have?
Air conditioning was standard, but no manual gearbox was offered. Jaguar raised the XJ6 and XJ12 front bumpers to meet U.S. regulations in the 1974 Series II, and fuel-injection replaced the V-12’s four carburetors, pumping the engine from 244 hp to 285 hp in 1975. The XJ6 was fuel-injected from 1978 and both were LWB-only from 1974.
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.
Which is worse a Jaguar XJ6 or XJ12?
Beginning in the 1970s, frustrated owners started fitting Chevrolet V-8s into the worst XJ6 sedans, although they are a poor substitute. The wiring harness must be modified, sending units swapped to make gauges work, and legal smog gear fitted in California. Plus V-8s vibrate worse than straight-sixes, and nobody trusts a mongrel.
Air conditioning was standard, but no manual gearbox was offered. Jaguar raised the XJ6 and XJ12 front bumpers to meet U.S. regulations in the 1974 Series II, and fuel-injection replaced the V-12’s four carburetors, pumping the engine from 244 hp to 285 hp in 1975. The XJ6 was fuel-injected from 1978 and both were LWB-only from 1974.
Beginning in the 1970s, frustrated owners started fitting Chevrolet V-8s into the worst XJ6 sedans, although they are a poor substitute. The wiring harness must be modified, sending units swapped to make gauges work, and legal smog gear fitted in California. Plus V-8s vibrate worse than straight-sixes, and nobody trusts a mongrel.
Can a mechanical problem cause an engine to misfire?
Many people also don’t realize that an engine mechanical problem can cause a misfire. Each cylinder inside the engine contains a piston that must compress the air/fuel mixture for complete combustion. And when the piston is moving upward, the cylinder must remain completely sealed off to create adequate compression.
Is it OK to drive an engine that is misfiring?
Instead from that, misfires can damage other sensors in the engine like the O2 sensors. So, I would never recommend driving an engine that is misfiring for any long distances. Short distances to your mechanic workshop without putting a load on the engine is fine, but do not ignore the misfires and keep driving.
How can I tell if my engine is misfired?
Misfires that turn on the check engine light and log a cylinder-specific fault code are the easiest to diagnose. A flashing check engine light and a P0301 to P0312 diagnostic trouble code (DTC) is a surefire indication that one or more cylinders are misfiring.