Spark plug question

my wife's car 05 s jaguar needs plugs. There supposed to be 100,000 miles plugs and she's got 80,000 but I'm getting anxious about them needing to be done. I'm worried about them being possibly frzozen in there. Can I spray a penetrant oil like pb blaster and let them soak so I have a better chance of no issues. Tia

 

What is leading you to believe they need to be changed?

Unless they were installed improperly you should have zero fears in removing them.

 

I don't see any issue with penetrant oil. Any that makes it into the cylinder will be burned off upon start up, assuming you don't dump gallons of it in there.

 

I would just try taking them out first...

 

Also note that almost every motor that i have worked on has a spark plug tube drain hole out the side of the head, so any excess will drain out the side.

That stated you shouldnt have an issue... unless its a ford modular motor from the late 90's / early 2000's haha

 

Thanks guys

 

Nothing with silicone in it. If some does get in the cylinders silicone can raise heck with catalytic converter efficiency. If the Jag is anything like my SL500 the cats are not cheap...

 

NGK has a video tutorial on replacing plugs and they say you can....NGK knows their shit too.

 

Most current RTV sealants and adhesives use a low volatility "sensor safe" (it's not really but in small quantities used occasionally it's OK) silicone, which could be used on plug I guess--however I was referring--In a less than clear manner--to the squirting some sort of penetrating lubricant into the plug bores, that might end up in the cylinders. The silicone in those sorts of penetrating things that have silicone is usually a high volatility type; which can, and will in surprisingly small amounts, damage catalytic converters.

Make sure whatever you use says sensor safe on the label...

 

I wouldn't worry about PB blaster, I would also use never seize on the replacements. After all, they're going into aluminum heads.

 

No need to worry. Spark plugs installed in aluminum cylinder heads have either anti-seize or a special plating at the factory to prevent seizing -- this has been done for years. The only reason I would worry is if the car has been living outside in a wet environment the whole time and then maybe the plugs themselves will have some corrosion but still you should be able to remove them without a big fight. You can use a little (A LITTLE) penetrating oil if you must, but it's not necessary.