Pulling original spark plugs
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Senior User
Joined: Sep 2017
Posts: 224
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From: Downriver,Mi
Pulling original spark plugs
Starting my own thread here. In the tune up thread thats going on right now, they had wished the OP good look removing possible original plugs. Whats your shop secret to removing stuck plugs?
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
When taking it off if you feel it give just a little and stop, take the ratchet back to snug and then repeat slowly until it gets loose and gives up. FWIW, I recently did my 91 250 with 460 and it had original plugs. 87K There is a white dot on the tip The plugs came out without issue.
FTE Chapter Leader
Joined: May 2006
Posts: 12,335
Likes: 1,312
From: Central Mississippi
If possible warm engine to operating temp, cool for a bit, pull the wires...
BLOW OUT the crud & grit around the plugs with compressed air. At the very least a small paint brush will do more than nothing.
Spray a small amount of PB Blaster directly on the plug base & let it set for at least an hour to draw into the threads as it continues to cool.
How much you use is proportional to how much smoke & stink you can deal with when it next cranks.
If you can't warm it up, let it set for a day or two.
BLOW OUT the crud & grit around the plugs with compressed air. At the very least a small paint brush will do more than nothing.
Spray a small amount of PB Blaster directly on the plug base & let it set for at least an hour to draw into the threads as it continues to cool.
How much you use is proportional to how much smoke & stink you can deal with when it next cranks.
If you can't warm it up, let it set for a day or two.
Elder User
Joined: Sep 2018
Posts: 735
Likes: 8
From: NC
50/50 mix of acetone and ATF in a squirt/spray can works well. As others have said, if you get it to turn a little, stop. use some sort of penetrating fluid (my Dad showed me the acetone/atf trick 30 yrs ago, it's dirt cheap compared to others) then tighten it back, liberally apply fluid again, work it slowly or galling could result.
More Turbo
Joined: Feb 2014
Posts: 632
Likes: 41
Also don't forget to make sure you have a nice stable elevated box / step ladder / something to get your body in the best position possible to reach the plugs in the first place. You don't want to be over-reaching or trying to do it one handed. Use an old blanket on the fender to give yourself something to lay on top of with a bit of comfort and scratch protection for the paint too.
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