Hi guys just completed the job of change I g the timming chains on my jag xj8 v8 2001. I only have the radiator to replace and auxiliaries. Question I have you know the 2 large camshaft gears on each side do they have to fit back on the camshaft in a certain spot as I just put them back on and fitted chains and torq them up.aa they spin free on the shafts as this only just come to mind.or don't it matter .

 

There is defiantly a rotational position of the camshaft with reference to the crankshaft position .

Do not turn engine over until you have this correct position .

Someone will come along that has that information on the V8

 

No problem what so ever. Fit them how they fit. I never really
worried about position. As long as you can get the pretensioning tool on in place, all is fine.

 

Hi yes just that I noticed there is a small hole in end of camshaft and just wondered if that should line up with the small hole inside the big camshaft gear.

 

+1

If you are worried about the engine being timed correctly just turn the engine manually, in the clockwise direction only, for a couple of revolutions. Then reinstall the locking tool on the flywheel and then take a cam locking bar and if you are timed correctly the bar should slide over the cam flats.

 

Well, a question now is: are ypu doing a 4.0l, 4.0l SC or 3.2l?

If ypu are doing a 4.0l, and if it is of later AJ27 type, you'll want the little two holes in the big cam sprocket to be turned counter clockwise to reset the VVT. Just in case you do a 4.0l non SC. The 3.2l and 4.0l SC don't have that. You need a special tool on the AJ27. The AJ26 does not require a reset of the VVT as it has a different actuation.

 

Hi not sure if mine is aj27.I'm not concerned about the cam timming as I had the cam lockers in place and the flywheel pin in place.what I am concerned about is the 2 big sprockets on each bank when u slide it off camshaft there is a oil hole in camshaft and inside the big sprocket there is a oil hole in there to.do they have to be in line with each other when u slide it back on or not as this is a oil feed.as I remember sort of linking bank 2 up but I don't this k I did bank 1.or does it not matter as will oil find it's away around inside gear wheel.

 

The fitment of the sprockets themselves don't matter, the bolts is what secures them in place. It was only the V6 engines you have to line up timing marks, etc. As for the V8's, the holes in the middle of the VVT is for oil. The bush carrier supplies oil pressure to VVT unit, which in turn will advance timing or retard timing through oil pressure.


As long as you have the crankshaft lock pin, and cam lock tools in place, it will be in time when you go to start the engine.


You just have to be careful when torqueing the bolts for the VVT - certain versions have a hollow bolt ( oil flows through the bolt into the VVT ), this will have a lower torque setting. If it's solid bolt like the exhaust one, then its the same.


Easiest way ( for me ) to tell difference between AJ26 and AJ27 was the " coffee can " on the throttle body, which was used for cruise control. AJ27 and AJ28 don't use this.

 

Hi yes I have the solid bolt.what I mean is the vvt gear has a oil inlet do I have to make sure that when I refit it back onto camshaft that the hole aligns up with the hole in the vvt gear.or don't it matter will the oil find it's way round the inside shaft into the vvt gear.

 

When you refit the bush carrier, there is a part of it that fits inside the VVT in the front. See pictures below - these might help




Remove the VVT bush carrier from the A-Bank.

1. Remove the three bolts which secure the carrier to the cylinder block.
2. Release the carrier from the two ring dowels and remove it.