Changing the cam chains on my early XK8 and got to start setting the tensions etc.
The manual says to fully retard the VVT system by rotating before tightening the sprocket up.
Got a VVT spanner but my VVT unit do not seem to have any method the assist rotation.
There is a large spring inside the unit fully compressed.
Assume this unit design cannot be set and work purely off the spring.
Attached photos for information.
Any practical experience and advise appreciated.

VVT unit and what I thought was the tool

Inside the VVT unit hole (compressed spring)

What I thought was the VVT setting tool

 

Search and find.

Discussed before.

https://www.jaguarforums.com/forum/x...-654-a-229839/

 

Doing a bit of research, the early Jaguar XK8 AJ26 engine it has on/off VVT units.
These are relatively primitive and operate to advance with oil pressure and retard via spring pressure.
They are not continually variable as on the later units.
1 sec lag on operation but no EGR units fitted on these engine, there is always a positive !
Hence. I don't think they will need setting and already reset by the spring if operating correctly.
Please let me know if I'm wrong because putting it back together over the Easter weekend.
Much appreciate any experience with these binary VVT units.

 

Webley, That thread is for a different VVT unit.
There don't seem to any holes for any tool to retard the VVT timing (even with the correct tool).
Assume this is because they are binary units not variable on my car.
Looking for info on these early VVY units.
Thanks Damian

 

You can verify that it is retarded by lightly tightening the intake cam bolt and remove the cam lock tool.
Grab the intake cam with pliers and attempt to retard the cam. It should advance but not retard.

Reinstall the cam lock tool and finish tightening the sprockets.

bob

 

Bob, Thanks for your reply, was good information, sorted the retard by moving with a rubber mallet, thanks Damian.