I recently purchased a VGC 1997 4.0 XK8 with mechanical problems very cheap, I thought it was just the transmission but on closer inspection the engine has a bottom end knock.

Has anyone put a 2001 engine in a 97 car and what problems did you come across, the mechanics plan is to have both engines on the bench and swap all the sensors wiring loom etc from the old engine to the new one, this is in the UK if there's a difference, my engine is the nikasil lined one, the 2001 is steel lined with variable valve timing as they changed in 1999.

I've spoken to a Jaguar specialist who says it'll go in but there may be sensor issues which should be fixable.

 

You need to use all your "old" stuff, i.e. flywheel, VVTs, camshafts (at least the intake ones), oil pump, ignition coils, knock sensors, camshaft sensor, crankshaft sensor (the latter might not be needed, but cannot say for sure), and probably better also the injectors (let them check first). That should be it from memory...

Andre.

 

this isn't going well, we didn't swap the oil pump or the flywheel as they looked the same, is there a reason we should have done , the engine starts and maintains good oil pressure but so far we haven't managed to get it running on 8 cylinders

at the moment it's only running on 4, I asked for some advice in the tech forum and the opinion was it was in some sort of engine protection mode , possibly because the engine thinks it's overheating so has cut the fuel to 4 cylinders in an attempt to cool itself down.

at one point it was running on 7 and everything in the car was Ok, temp and oil pressure bang in the middle, even now it's running on 4 the car isn't displaying any faults on the dash display

It's starting to bug me now

 

The AJ26 Flywheel is different from the AJ27 you have used. This one determines timing amongst others, so a crucial part, you need to swap.

The oil pump might not need to be swapped, but each engine type has an oil pump specifically for its needs. The VVT systems work on with oil pressure and as the AJ26 is different than the AJ27 it would be safer to use your old pump, but again this might not be needed as I do not know the different oil flow pressure/needs between these 2 systems.

Make sure all the other parts have been swapped as suggested.

Andre.

 

Thanks for that information, I wish you'd been around 4 weeks ago

he hasn't swapped the flywheel which would probably explain why it's not running right , i've just told him , to say he's not happy would be an understatement

he does have a question, how are they different, the starter is the 1997 starter on the 2001 flywheel, if it was a bigger/smaller diameter surely the starter wouldn't engage as it'd need different gearing wouldn't it ?

the scanner he has does show up a cam to crank out of position fault despite him pinning the crank and setting up the cams with the correct tool but the car does run albeit very badly

 

Just read a post on another forum, and now I checked this one ;-)

It is not the gearing (so outer ring), the difference is in the hole pattern on the back (side to the engine) where the crankshaft sensor reads the crank shaft position.

Andre.

 

that's me too, i'm going to give him the bad news tomorrow

 

Avos, you have my eternal gratitude for taking the time to reply, we spent all day pulling the gearbox back to get at the starter ring gear, you were correct, they are different, the AJ26 had a long hole which tapered at the end, the AJ27 was a smaller regular hole on the opposite side.

It took about 6 hours to do and at 5pm it was all back together, I turned the key and it sprang into life sounding fantastic with no faults

By then we'd both had enough so it'll be monday before we finish it off

 

Good to hear you got it fixed!

Andre.

 

I have the same problem you have.. I need to know if the flywheel timing has to be changed from engine 97 to 2001. Which are the sensors that must be replaced. Thanks. I also need to know if the cam shaft sensor must be replaced. Also also the cam shaft rotor is different from the engine 97.

 

The 2001 engine that was fitted into my 1997 XK8 came from a Xj8 so everything had to be swapped , sump, pickup pipe , cams , the starter ring gear

Pretty much everything apart from the block and heads

If the 2001 engine you have came out of a XK8 I wouldn't know if it's the same

I no longer have the car, sold it earlier this year but it ran faultlessly in the 4 years I owned it

 

In a Jaguar 1997, has anyone put a 2001 4.0 engine in a 1997 XK8? The timing disc of the 1997 is different to the timing disc of 2001. When you have 2001 running in 1997 you have only four cylinders running. Are the camshaft of 2001 and the 1997 the same? The camshaft position sensor timing ring of the 1997 is different of the camshaft position sensor of 2001. I installed the position sensor timing ring of the 1997 into the 2001 engine. The engine runs, but only on 4 cylinders. The ECM is 1997.

 

Greetings,
Does anyone know the thickness and the O.D. of a 1999 Jag XK8 flexplate flywheel?
Nissan pops right up.
Been to 15000 different Jag sites...
Many thanks,
Bill