Is possible that is this engine for Jaguar Daimler double six 12- cylinder 6.0 litre from year 1972 ? Or is wrong date ?
How much is worth with gearbox ?







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It wouldn't be from 1972, no.

Not sure about value


Cheers
DD

 

I'd say 1995 or 1996, with 4L80e transmission.

People do buy these up. Normal from down under has bought a few, I think for $1500USD.

Rob

 

Centainly not 1972,

A/C compressor and 4L80E transmission suggest its a 1993 - 1996

As for value....generally low, These late v12 vehicles were sold in small quantities and very reliable so very few replacements are needed. Block would be good for a swap but engine management becomes an issue. That said if you need one in that state you might not find another for a long time.

 

Thanks for info... so is possible to put this 6.0 engine + gearbox into my XJS 5.3 - 1983 ? What do I need to convert ? Computers, wirings? How much work is it?

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In the end, probably not worth it unless you had a complete car to start with. Lots of engine and transmssions management issues and would cost 1/2 what simply purchasing a later car would cost and then you wouldnt have all the other benefits of a newer car. 4l80e is a clunky but very durable truck transmission which can handle 600HP Turbo LS engines stock built . It has no place in a sporting GT. If your 83 was in a good state of tune and you simply added a 4l60e you'd have a faster more responsive and more sporting vehicle. A mild rebuild of a 4l60e can handle up to 450HP easily and the 4l60e is a much lighter transmission and less parasitic to operate. Also the 4L60e has a much deeper first gear which helps the car off the dig. The considerable 1 to 2 gear shift RPM drop works just fine with the broad and flat power curve of the v12 and the taller 4th gear locked up will cruise along sedately with great economy. With either swap the rear diff will need to be changed. 3:54 would be great but the more common 3:31 would work great with the 4l60e's deep first gear too.

So as I see it, a 4l60E, adapter and stand alone controller would offer similar performance to a 6.0 / 4l80e for much lower cost which could get done and back on the road in a reasonable amount of time.

As a general rule, never convert a car to something that already exists, just go buy it. It will cost about the same or less in the end if you factor in resale value. It's better to convert a car to something that does not exist for example, adding a 6 speed T56 or 4l60e. Both transmissions are a better fit for a GT.

Time is money, life is short. Plan accordingly.

 

Yes I agree with you - time is money, life is short My 5.3 engine is ok, but have problems with Oil leaking. Every year is worst (rear crankshaft seal). Repair is complicated and very expensive...One more question: is possible to put only 6.0 engine inside (is same dimensions? )and hold all odhers components same ( my gearbox, computer, whires, fuel injections…). Or this this 6.0 engine need totally different "support"?

 

I've always admired the Jaguar V12. Ran a Daimler Double-Six VdP in 1976 but the single figure mpg forced me back to a 6 cylinder in less than eight months.

I think this summarises the V12 development and models:

5.3 Litre
1971-1974: E-type Series III
1972-1981: Jaguar XJ12
1975-1977: Jaguar XJ12C
1972-1981: Daimler Double-Six
1975-1977: Daimler Double-Six Coupe
1975-1981: Jaguar XJ-S

5.3 Litre HE
1982-1992: Jaguar XJ-S / Jaguar XJS
1982-1992: Jaguar XJ12
1982-1992: Daimler Double-Six

6.0 Litre
1988-1993: Jaguar XJR-S
1993-1995: Jaguar XJS
1993-1997: Jaguar XJ12
1993-1997: Daimler Double-Six

Daimler is the prestige Jaguar model specification in Europe and Australia but not available in the US where Mercedes own the rights to the brand. I expect the highest US specification would therefore have been marketed as Jaguar XJ12 Vanden Plas.

It would be good to determine engine number ranges for the above but I can't find anything official from Jaguar.

Graham

 

As a physical matter yes with many many caveats... The 6.0 block bolt pattern where the transmission bolts to is different so the block will need to be drilled and threads tapped in many locations. As for the computer and fuel injections, you will need to swap over many old electrical items from you old motor and raise the fuel pressure to get it to run right. That will be a very imprecise way to fuel and it will hoover the petrol like never before.

As a practical matter, not a good use of time. becasue in the end you will have solved an oil leak but created many new issues.

I get your dilema, the early rope seal car leak bad. some times. You may want to repair it. Review this.
https://www.jaguarforums.com/forum/x...l-seal-151343/

If you like the car you may want to approach it differently.
Engine out, fix the seals
upgrade / replace engine mounts
Upgrade / replace rack, subframe and suspension bushes
New exhaust donuts and or down pipes
Install 4l60E​​
​​​​In the end you'll have an over all better car for a lower price that's less of a science project. Might still leak a bit here and there.

The 6.0 / 4l80e is a great combo but with out the complete harness, TCU and ECU it's just not practical, Doable yes, if you want to climb that mountain becasue its there then go for it but the learning curve is steep if you've not done this before.