Hi there,

I've been asked to change the chains and tensioners on a 4.0l non s/c XJ8 with the standard VVT.

How should that be set up in order to prepare the timing correctly?

Cheers

Damien

 

You need to download the JTIS. There also was a series of threads done by Danielsand a couple of years back that walked you through the process. There is also a YouTube series.

I think a Google search using chains and tensioners for a Jaguar XJ8 will pop up lots of info.

Also, Bob Gauss put an engine rebuild tutorial in the stickies.

 

+1 on reviewing procedure on JTIS or Workshop Manual.

There are also several special tools involved in the process to get the cam timing correct.

 

I uploaded my Engine Repair Course Code 168 from Jaguar Training back from a dozen years ago. The .pdf is too large to attach to a post (9mb+) but it is somewhere in the large file area.

It has BOTH V6 and V8 engine info.

I also have the Engine Repair Course Code 180 but it is ONLY the V8 and the 168 has BOTH so I never had it copied into a .pdf.

bob gauff

 

Hi Bob,

Yeah I downloaded your pdf and it is helpful, but I can't find a way to reset them in it!?

@ other

I'm no stranger to the chains on the V8... Have changed them but I am worried about resett Ing the VVT. I have the tools to dothe job... So nothing missing there.

 

This tutorial may be of help, the car has VVT but the earlier type I think :

Tmingi chain and tensioner replacement

 

Unfortunately no Word about how to reset the VVT on the X308 V8... :-/

 

Do a Google Search against VVT in a Jaguar 4.0L V8

I found this:
Use a Primary Chain Wedge (303-533), or 2 if needed, between the primary timing chain tensioner and primary timing chain tensioner blade, to take up the slack in the chain for tightening of the variable camshaft timing control unit and exhaust camshaft sprocket. See Fig. 154.
Using the chain tensioning tool, apply force to the tool in an counterclockwise direction to tension the chain on its drive side. See Fig. 151. While applying opposing force to the sprocket and chain, tighten the exhaust camshaft sprocket bolt to specification. See TORQUE SPECIFICATIONS.
Using the Variable Camshaft Timing Oil Control Unit Setting Tool (303-654), rotate the variable camshaft timing oil control unit fully counterclockwise to the fully retarded position. See Fig. 155.
Check that the primary chain wedges are still in place. While applying opposing force to the sprocket and chain using the chain tensioning tool, tighten the variable camshaft timing oil control unit bolt to specification. See TORQUE SPECIFICATIONS. Remove the chain tensioning tool and the primary chain wedges and camshaft locking tool.
Raise and support vehicle. Remove crankshaft setting peg. Install the CKP sensor and bolt to the flywheel housing. See Fig. 143. Tighten the CKP sensor bolt to specification. See TORQUE SPECIFICATIONS. Install the access grommet to the housing and lower the vehicle.
WARNING: Check that the ring dowels are engaged squarely. Fully locate the assembly as much as possible by hand. Failure to follow this procedure may result in damage to the vehicle.

 

Thanks Jim.
There have been a number of folks that argued no such procedure needed to be followed, but if the VVT is not aligned correctly when the cam bolt is tightened, thenthe timing will be off. Probably only by a few degree, but it will nevertheless, not be optimal.
That also goes for the problem with using the zip tie method. The non moveable slipper on a 3rd gen tensioner is not at exactly the same dimension as the old slipper, so the phase of the cam relative to the crank can be off by a small angle bacause the tight side chain path becomes a different length. Not enough to matter, MAYBE, but not at the specified angle.