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I hope the photos come thru alright i have to rely on my wife to do them as i dont no much about photobucket and copy and paste.Id rather work on my toys .
The ZF 4speed Auto and 5 speed manual were the only gearboxes that i no of that were fitted to XJ40. 4.0 LITRE cars had the heavier duty 290 getrag and earlier 2.9 and 3.6 had 225 and 245 getrags.i dont know iff you got any 2.9s over there.the difference from the 225 getrag had a seperate bolt on bellhousing and speedo cable.The 245 getrag had gearbox and bellhousing all as one unit with transduser at the diff end for electronic speedo.
Cheers Ray .

 

Just a thought the same gearbox from XJ300 3.2 auto and 5 speed manual will also fit as they are same.that might give you more to pick from
CHEERS RAY

 

then engine looks like it was designed to be in there!

here in aus it seems a 4l xj40 can be picked up for about $500. the body's look rough but most of the sellers reckon the run and drive well. although it may be more complicated tranny wise ide be more inclined to stick a 4 litre in there as i want the extra power.

does this pic have the xj40 rad and shrouds the place? also, does it use the xj40 rad hoses? how about engine oil cooler?

ide probably do without air con but how different are the systems?

my other 2 cars are manuals and i dont like how cramped the xj's foot well is so ide be inclined to stick with auto because its nice to be lazy sometimes.

but from what ive gathered the 4.0 uses an electronically controlled gearbox, does this have a separate computer or is it integrated into the ecu? i think ide have a look at fitting the spedo out of an xj40 in the series 3 spedo casing, but does it have an main processor in the dash that ide need to wire up to it as well or is it standalone from the diagnostic / electronic gauge feature?

this is proving very interesting,

thanks
jay

 

Hi jay the ZF HP24 fitted to 4.0L had a seperate computor. The series 1 and 2 4speed manual o/d pedel box fit ok which was used in the s/2 in photos ; some S/3 had an earlier version 5 speed similer to the rover box that peddle box would be ok.
To solve my electronic speedo problem the XJS 3.6 runs the same diff type as series 1-2and 3 but with an alloy finned cover with the transduser mounted to the cover. The pickup for this was a serated band around the powerlock clutch inside the diff i purchased one of those bands and had it swetted on to the powerlock clutch. A complete diff would have been an easier opptsion but nothing was available at the time. The AJ16 engine i beleive is a lot more difficult to install to the earlier series than the AJ6 because of the coils over plugs and most parts run thru modules. it could be done i think if you run it from an after market dial in computer.Some thing i will try before i leave this planet. I used top and bott radiator hoses from XJ40 with XJ40 radiator. so the bonnet would close i used the XJ40 top radiator panel and series 3 air filter;the xj40 radiator is slightly higher but narrower than series 3 + lighter as thay are alloy. As for power the aj3.6 is 221 bhp the 4.0 is 228 bhp but heaps more torque the aj16 3.2 is 218 bhp and aj16 4.0 is 245 bhp aj16xjr is 326bhp.
Cheers Ray

 

just rememberd air con was standard series 2 inside car with hoses on engine ends were xj40 to fit compressor and evaporator.
Its hard to remember everything as there are a lot more smaller isues as we got into it .but keep asking
Ray

 

Ray,

Very cool. Thanks for the pictures and all the information. That engine looks good in there. It has enough of the classic look on the cam cover to not look at all out of place. I think the later AJ16 cover would look to modern.

Did you have to modify any bodywork/structure to make all the changes you did?

Just curious if you thought the use of the Series 3 air cleaner was causing any restrictions on the intake side.

Thanks again,

Eric

May I ask what a conversion cost? I mean just the drivetrain.

 

Another more general question: are there any differences between the AJ6 engines form 1988~1994?

Eric

 

the spedo problem seems rather complicated. is there any provision on the box for a cable / sensor?

i rang my jag dealer and he will sell me a 3.6 engine and box with 140 on it for $500. includes the loom and i think he wanted an extra $100 for the ecu but im sure if i pushed the matter he would throw it in.

how hard is the j gate snifter to get in there. i assume it uses a cable? does it fit around all the junk thats under there or do you need to cut and shut the air ducts ect? i assume i would need to make up brackets aswell as if i buy this engine i wont have a floor to cut the brackets off.

thanks,
jay

 

One more detail question that popped in my head: did the conversions you built retain cruise control? If so, how was that set up?

Eric

 

Very impressive. An excellent example of fine craftsmanship.

I'd allow driveway space for that car any day, RHD and all!!

Carl

 

I ran a series 3 with XK six cylinder and GM T700R4 transmission using the Johns Cars kit. I was getting 21(us)mpg with it at highway speeds. 65 mph will give you 1800 rpm in overdrive. I don't have the car anymore but the GM transmission is now behind the v12 in my 87.

 

Thanks for the reference point! That is good information and higher than I expected. It has me questioning which route would offer the best bang for the buck. Meaning power and mpg. Seems like the mpg might be similar with a slight nod to the AJ6. Stock the AJ6 has more hp, but could you get similar power out of a rebuilt XK engine with some headwork? What do others think?

Eric

 

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Hi all thought while my wife was next to me on my lap top i would have her help me post some photos of race car converted from V12 to AJ3.6 but more about that later.
Hi Eic no body modifications at all had to be done except at rear gearbox mount new holes had to be drilled to take different rear mount; i needed to remove front seats so i could so i could make apropriate plate with bolt next to the tunnel.
The air cleaner is actuatly XJS3.6 they were different than XJ40 cleaners' but we did later on fit a K&N filter. The drive train back in 2003 cost the customer $3200 NZ.that was complete from fan to end of gearbox incuding ECU and wiring harness.That engine at the time had only done 73000. KMS..then there were extras like all the bits around engine bay like header tank radiator ect .i also fitted series 3 central locking to all doors and boot at customers request.
In 1983 the XJS 3.6 was introdused with similer injection system as series 3xj6 but only with 5 speed manual no autos.Then in1987 the XJ40 came out with the revised aj3.6 with later type injection and crank speed sensor.In August 1989 they introdused the 4.0litre and later stopped making the 2.9 S O H CAM in favour of a3.2 aj6 double over hed cam.I think from1990-1994 werejust the 3.2 and 4.0 litre.some suttle changes were made but all fit the same.
( Speedo cable problem)there is no provision on auto ZFboxes for cable the only one i no of is the early 225 manual getrag has speedo cable drive.these were in the 1983 1986 XJS3.6 and maybe very early XJ40.I have heard that not a lot of xjs3.6 went to Aussie not sure on that though. The J gate fitted in ok it sits a little bit higher and does work by cable;no cutting of air ducts needed but had to do away with both ashtrays and have one smaller one nearer lid.this was because the right hand ashtray fouled up with the liniear switch for auto start.Cruise control was not retained.customer was doing that later i suggested series 3 style switch on console or dash but we kept all required part on engine for later fitting and just block off the vacuum hose.
Cheers Ray