Hi all, I took on a little restoration project on my XJ8 and got to changing up the spark plugs while touching up the engine and I ran across a little problem.
Two of the spark plugs were stuck to the ignition coils making them near impossible to remove.

After spending hours trying to wiggle and pull them out i finally gave up and gave a solid pull causing the rubber bottom half of the ignition coil to tear and after a while rip and come off. After still another few hours tearing out the remaining pieces of rubber i finally got it all out and clear.

My question is what may have caused this to happen?
I did notice the two stuck were the only two ignition coils I had that did not have the Jaguar branding on the sides, my guess is they are after market replacements. The rest pulled out easily with little effort.

Could it be they were to small in diameter, or maybe just two faulty parts or something like that?
Also once the replacements arrive how can I best prevent this from happening once again?
Would it be safe to apply a small amount of antiseize to the rubber tip of the coil?

Thanks Everyone

 

Small amount of silicon grease applied inside the boot with a Q tip

 

Thank you!

 

Don't forget a little anti-sieze onto the new spark plugs when inserting them. Good luck!

 

That could have happened if a little moisture got in there and then corroded them together...




This

you can also apply it directly to the top of the spark plug itself.

I think this also give a better contact.


I 2nd the use of anti sieze (on the threads only), remember you have to back off the torque specs 20% when using anti sieze.

Do these two things and you will never have that problem again.