Loose spark plug

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Mar 3, 2011 | 05:53 AM

jbarefoot

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Loose spark plug

Any of you guys ever have this happen? I put new plugs in and I noticed the one at the back was loose. So yestreday I was doing a compression test and and that same plug was loose again. I know I tightened it when i replaced it.

Mar 3, 2011 | 10:30 AM

Harte3

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From: Spokane, WA

Not an uncommon problem with some I6s. I had a 170 in a Ranchero and had to tighten the plugs about once per week. I haven't had that problem with any of my 300s.

Mar 3, 2011 | 11:50 AM

AbandonedBronco

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From: Boise, Idaho

I think it's just engine specific. I've probably seen the same amount of threads for complaints of spark plugs seizing right up (even if put in earlier that week) as I have for spark plugs that loosen up on their own.

Would a little loc-tite on spark plugs have any negative affects?

Mar 3, 2011 | 11:52 AM

dustybumpers

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From: In my own world

2 of my 300's do that. you can tell it's happening, it will flutter as you go down the road. sometimes the 1 truck will go a whole year without doing it, then will do it twice in 1 week.

Mar 3, 2011 | 11:53 AM

dustybumpers

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Quote:

Originally Posted by AbandonedBronco

Would a little loc-tite on spark plugs have any negative affects?

I will pretend you didn't write that..........

Mar 3, 2011 | 12:02 PM

AbandonedBronco

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From: Boise, Idaho

Lol, that's why I asked. I have no idea on that one. Always better to ask first than try first.

Mar 3, 2011 | 12:05 PM

dustybumpers

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From: In my own world

neverseize is good. sometimes even then, they'll seize. the loosening plug thing is a pia, but you get used too it. noone said the 4.9 wasn't a hands on motor. hehehehehe.

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Mar 4, 2011 | 09:09 AM

turnofftheradio

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Joined: Dec 2009

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From: michigander

mine did that a few times on almost every plug. i have found that from being loose the beveled edge gets kinda crusty on the head where the plug seats. I cleaned the beveled surface very well and have yet to have another problem with them coming loose.

Mar 4, 2011 | 09:39 AM

#10

77h0t_r0d_wrecker

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From: Effort, PA

I've had it happen as well. In fact when I put the fresh (60k miles on the engine and trans) drivetrain in the 86, I was going to pull the plugs on my old engine and I think 3 out of six could be turned by hand.

So yeah, not uncommon