Spark Plug Change Nightmare - JeepForum.com
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post #1 of 8 Old 12-09-2019, 10:01 AM Thread Starter
Darnice
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Spark Plug Change Nightmare

Well, was time to change the spark plugs in my 4.7 HO. It had gone 100,000 miles on the previous set of platinums so they were do for some attention.
Drivers front came out without too much fuss, it was tight all the way out but did come out.
Looks like over the extened time the anti seize had dried up and was making it difficult.
The rest were far worse, very stuck, and the force needed to undo them was bordering on breaking them.
So I stopped, sprayed some penetrating oil in each well and let them soak for 24 hrs.

Next day it was not much better, so I just took it very slow, 1/2 half a turn then back off a little less than that then a bit more each time. The were really in there, and the fear of snapping one was very present.

Got them all out (3 hrs) except the fun one at back passanger side. You can only do one click of the rachet at a time. A universal was of no help as the plug was stuck like all the rest. Took an hour to get that last one out! and many #$%@$%^

Gap was over .050 on all from wear.

Installation went fine, what a relief. I have never had plugs so stiff to turn out, the feeling of threads gauling or plugs about to snap is not a fun feeling! Taking your time and slowly working them without forcing was the key.

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post #2 of 8 Old 12-09-2019, 10:34 AM
mrsirio
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Well done! That #8 is a fun when smooth. Canít imagine when itís stuck.


Sent from my iPhone using Tapatalk

2003 Grand Cherokee 4.7 HO Overland, 2" IRO, Bilstein 5100, Geolandar A/T G015 245/70 R17.
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post #3 of 8 Old 12-10-2019, 08:24 AM
Double E
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I think I rread that it is possible to get 1/2" or so of room back there by raising the body with a jack slightly. I think I read that the engine will compress the mounts a little and sit on the mounts as the body comes up. I've not tried it yet though.
Glad you got it sorted...I'll be doing the same in the Spring.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #4 of 8 Old 12-10-2019, 06:20 PM
three_jeeps
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Quote:
Originally Posted by Darnice View Post
Well, was time to change the spark plugs in my 4.7 HO. It had gone 100,000 miles on the previous set of platinums so they were do for some attention.
snip
Well I bet that was fun. IMO, you get what you deserved...100,000 on a set of plugs is utter nonsense in oh so many ways.
j
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post #5 of 8 Old 12-11-2019, 09:46 AM
Proudy202
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Funny I've just had the same issue at the weekend, I bought the Jeep back in February with 153,000 on it just passed 159,000 so decided I'd give it a tune up, old plugs were stiff but not as bad as it sounds for you.

Anyway this is what came out....

Safe to say shes running much smoother now!!!
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post #6 of 8 Old 12-11-2019, 11:57 AM
Double E
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Wow. Time to do everything on it then...clean TB, diffs, TC fluid, PS fluid flush, brake fluid flush, etc.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #7 of 8 Old 12-12-2019, 09:47 AM
Proudy202
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Quote:
Originally Posted by Double E View Post
Wow. Time to do everything on it then...clean TB, diffs, TC fluid, PS fluid flush, brake fluid flush, etc.
Yeah that's my plan, got all the fluids for the diff, TC and Trans, waiting on some lubelocker gaskets and a new MC to arrive then doing it all this weekend, got PS leak too so may be swapping the pump and lines out.

Going to be like a new car!!
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post #8 of 8 Old 12-14-2019, 07:44 AM
AVR2
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Beware with PS pumps. I believe new ones are non-existent and there are many, many reports of bad remans, even the Mopar-branded remans.
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