I'm looking at doing the full primary / secondary tensioner and guide swap soon and have been searching a lot of the prior threads. There is a lot of good information on the site here and I've made a list of some frequently encountered issues with the swap.

So far I have bought the cam locks, crankshaft pulley tool / puller, VVT tool, and a few other recommended tools.

I also reviewed the Black Onyx instructions (Timing Chain Replacement) but I am looking for the Jaguar factory manual for the procedure.

I found the 2,490 page one on the forum here but several instruction headings say it is for the AJ26, not the AJ27.

X308 Workshop Manual

Would this manual work for the AJ27 motor or are there significant differences in the removal / installation procedure?

Also, do you all recommend a new crank pulley bolt be installed or should I reuse the old one?

Thanks,
Chris

 

Well sing us a song you're the pianoman.......

I uploaded my copy of the V8/V6 engine repair course 168 and it is all over the internet.

The basic timing chains are the same for AJ26, AJ27, AJ28 et cetera.

bob

 

Thanks Bob! Just printed out a bunch of the instructions...will read over them well before jumping in

 

I am new owner of 1999 xjr with 52,000 miles.
like so many owners I am concerned as to whether the tensioner and guides have been replaced.

Just prior to my purchase the previous owner had the car serviced by a Jag dealer in Florida. He gave them carte blanche to do anything that the car needed . Aside from basic fluid services and inspections the only thing else they billed him for was a new supercharger belt.
. My question is this. As a Jag service center is it logical to assumed that if tensioner and guides, as well as water pump had not previously been done then they would have recommended such services be done?

The previous owner was u sure as he got car from his father in law. But he did state the car was only and always dealer serviced.

Has anyone been able to verify such services through contacting dealer for records research via VIN vs actual partial disassembly and self inspection?
Perhaps the obvious answer is never assume, verify with your own eyes. Thanks.

 

Remove one of the cam covers and have a look. If the secondary tensioner body is plastic, they must be replaced.

Given the age of the vehicle, regardless of miles, the primary and secondary chains, guides and tensionsers should be replaced if they're the originals to prevent catastrophic engine failure.

 

Yes that really is the obvious way to proceed isn't it. I guess if I knew that if it had been serviced with updated valve train parts earlier in its life I might not feel so worried about making it an immediate concern . I think it may need a valve cover gasket anyway so I will use that procedure to conduct a proper inspection.

 

Even if the secondary tensioners are metal-bodied, have a look at the primary chain guides. Sometimes owners just replace the secondary tensioners leaving the primary components untouched resulting in the primary guides breaking with pieces ending up in the sump.