Does anybody know what the torque spec is for the valve covers on our cars?

 

NOT VERY TIGHT.

There possibly is a setting somewhere, but honestly I have never bothered.

They are a "shanked" bolt, so NO matter how tight you do them you will not pull the cover down any tighter on the seals.

All you will achieve is a snapped thread in the head, and quite vulgar language sprouting from you.

I simply tighten them a tad over firm, or as the Americans say, "just snug them up". Common sense is the main thing here really.

Replacing the small seals under each bolt every few years keeps things at the proper "crush", and tension.

 

I would recommend any X300 owner to get the Jaguar Heritage CD for this car. It contains the service manuals which have torque charts for all major fasteners along with a huge amount of other extremely useful information for any DIY enthusiats.

 

I agree.

To be honest....and I'm not trying cast aspersions on anyone in particular...I've always been a bit flummoxed at the unwillingness of DIY enthusiasts to purchase proper manuals for their cars. I've seen it a hundred times over the years.

In the case of Jags like our X300s the Heritage CD is only $30 or so....even less if you do business with an Ebay bootlegger (not that I'm recommending that!).

About the cost of one oil change.

Cheers
DD

 

Perfect advice as usual.

I use the "three fingers pull" method :-). That is, whatever force can be exerted with three fingers on the wrench or rather handle.

On the old XK engine with their delicate litte cam cover studs I used a "two finger pull" :-)

Cheers
DD

 

I realize it's an old thread, but ran across this doing some cam-cover research and thought I'd add the answer according to Jaguar...not that there's anything at all wrong with the sage advice posted by Grand and Doug!

(values in the chart are given in N*m)

Edit: Disregard the posted pic, according to post #9 here: https://www.jaguarforums.com/forum/x...rk-plug-68358/
the spec has been revised to 6.5 N*m by TSB.