Seized Spark Plug 352FE help!
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4th Gear
Joined: Nov 2020
Posts: 4
Likes: 2
Seized Spark Plug 352FE help!
Changing out spark plugs in my 1967 F250 and discovered the plug in cylinder 8 is totally seized. Who knows how long it’s been stuck in there.
Anyway I feel like I have tried everything. WD40, PB Blaster, air impact wrench, breaker bar with 5ft extension for leverage. It’s not budging.
what am I missing? Is this common in FE’s? What else can I try?
Anyway I feel like I have tried everything. WD40, PB Blaster, air impact wrench, breaker bar with 5ft extension for leverage. It’s not budging.
what am I missing? Is this common in FE’s? What else can I try?
Last edited by Charlie_67; Feb 3, 2023 at 08:52 AM.
5th Wheeling
Joined: Dec 2020
Posts: 34
Likes: 9
From: Wachtberg @ Rheinland
Sounds like you tried most of the options I know except for the magic of using a heat gun and / or the 50/50 acetone/ATF tricks ... 🤔
https://www.ford-trucks.com/forums/1...etone-atf.htmlCheers and good luck! 🤞 Markus
Mountain Pass
Joined: Nov 2022
Posts: 226
Likes: 83
From: South East Kansas
Time is your friend when soaking, threads to break them loose. You probably already knew that, but i thought I would mention it.
I use a mix called Ed's Red to break bolts, as it works about the same as Kriol and its cheaper. Its actually a concoction, from the gun hobby, used as a cleaner.
There are a few different mixes, but its basically a 1/3 mix of non synthetic Trans Fluid, (old type F trans fluid works well) Acetone, and Diesel or Kerosene.
Some leave out the Acetone and use mineral spirits, so it is more paint safe.
Give it a day or 2 so it can soak in, before you try to loosen again.
Worst case, if you have a cutting torch, use that you put some heat on it. Cycling it from hot to cold will some time break the bond, and then heat and try to remove while hot.
Lots of luck.
I use a mix called Ed's Red to break bolts, as it works about the same as Kriol and its cheaper. Its actually a concoction, from the gun hobby, used as a cleaner.
There are a few different mixes, but its basically a 1/3 mix of non synthetic Trans Fluid, (old type F trans fluid works well) Acetone, and Diesel or Kerosene.
Some leave out the Acetone and use mineral spirits, so it is more paint safe.
Give it a day or 2 so it can soak in, before you try to loosen again.
Worst case, if you have a cutting torch, use that you put some heat on it. Cycling it from hot to cold will some time break the bond, and then heat and try to remove while hot.
Lots of luck.
Lead Driver
Joined: Jul 2011
Posts: 8,678
Likes: 191
From: On the Edge of the Desert
Keep soaking it with PB blaster daily. After a week, get it hot and put an impact wrench on it. The percussion will help break it loose.
Heating and cooling will also help. CRC makes a can of freeze-off. useful at times like this
Heating and cooling will also help. CRC makes a can of freeze-off. useful at times like this
5th Wheeling
Joined: Jan 2023
Posts: 33
Likes: 2
Drop all those lubricants and go buy Kroil. Very fast working and works way better than all those combined. Soak them all day and try the next day.
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Fleet Mechanic
Joined: Apr 2017
Posts: 1,391
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From: COSMOS
This remedy takes a little time , maybe : Drink 11.75 regular beers 
( real beer no light wimpy beer ) .Do not **** for 2.75 hours minimum
the longer wait the better 
Then start truck , get a 6 foot ladder , climb to top quickly , pull down pants & "**** on the number one spark "
Spark plug may not come out but you will feel MUCH BETTER
A REAL MECHANIC WILL **** ON ALL OF THEM BY THE FIRING ORDER
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Lead Driver
Joined: Jul 2011
Posts: 8,678
Likes: 191
From: On the Edge of the Desert
Originally Posted by RTT
This remedy takes a little time , maybe : Drink 11.75 regular beers ( real beer no light wimpy beer ) .Do not **** for 2.75 hours minimum
the longer wait the better Then start truck , get a 6 foot ladder , climb to top quickly , pull down pants & "**** on the number one spark "
Spark plug may not come out but you will feel MUCH BETTER
A REAL MECHANIC WILL **** ON ALL OF THEM BY THE FIRING ORDER
Cargo Master
Joined: Jan 2016
Posts: 2,671
Likes: 372
My strategy is to run it to operating temp (assuming it runs), soak the plug with PB Blaster, let it cool over night and repeat each day for 5-6 days. Then use a regular plug socket and ratcheting wrench. If and when it starts to move, work it back and forth (tightening and loosening) several times and gradually work it out. Sometimes if it starts to move and you muscle it all the way out the rust will ball up and wreck the threads in the hole.
Before the plug is completely out, use compressed air to blow away dirt and rust.
Then use a spark plug thread chaser gently to clean the threads in the hole.
Remember the anti-seize before installing new plug.
Before the plug is completely out, use compressed air to blow away dirt and rust.
Then use a spark plug thread chaser gently to clean the threads in the hole.
Remember the anti-seize before installing new plug.
Mountain Pass
Joined: Nov 2022
Posts: 226
Likes: 83
From: South East Kansas
Maybe not then, on the anti seize on the plugs? I have fought a few stuck plugs, where these older style plugs were used, so I coat mice lightly.
Power steering and factory air on the 70's trucks, made fighting a stuck one a real bummer.
I cant say that i ever had any drivability issues doing it, or can really say that it prevented a stuck plug in the future. I just always brushed on a coat of it, with the hope of preventing headaches later.
Since there is always a first, and I learned a long time ago to never say never, with women or mechanical things.
Brad
Power steering and factory air on the 70's trucks, made fighting a stuck one a real bummer.
I cant say that i ever had any drivability issues doing it, or can really say that it prevented a stuck plug in the future. I just always brushed on a coat of it, with the hope of preventing headaches later.
Since there is always a first, and I learned a long time ago to never say never, with women or mechanical things.
Brad