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98 Expedition - Spark Plug Torque to prevent spitting plugs #5130226
06/10/19 12:27 PM
06/10/19 12:27 PM
Joined: Mar 2011
Posts: 433
Florida
Fitz98 Offline OP
Fitz98  Offline OP

Joined: Mar 2011
Posts: 433
Florida
I am changing the plugs on my 98 Expedition 5.4 4x4.
Torkspec website says 10 lbs torque on plugs to head, but I have also read to increase torque to prevent spitting plugs.
Anyone know the magic number to torque these into the triton aluminum heads?
I have spit a plug before and would like to prevent it again if I can.
Was there ever a TSB?

Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130264
06/10/19 01:05 PM
06/10/19 01:05 PM
Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline

Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
From the FSM 16-20Nm or 12-14ft-lb


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130301
06/10/19 01:35 PM
06/10/19 01:35 PM
Joined: Jun 2003
Posts: 18,990
Apple Valley, California
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,990
Apple Valley, California
I would use my arm and go strictly by feel.


02 Wrangler traveler sae30
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Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: bdcardinal] #5130362
06/10/19 02:30 PM
06/10/19 02:30 PM
Joined: Mar 2011
Posts: 433
Florida
Fitz98 Offline OP
Fitz98  Offline OP

Joined: Mar 2011
Posts: 433
Florida

Originally Posted by bdcardinal
From the FSM 16-20Nm or 12-14ft-lb

So there was no TSB to prevent spitting plugs out of head?

Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130364
06/10/19 02:31 PM
06/10/19 02:31 PM
Joined: Dec 2016
Posts: 8,743
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,743
Waco, TX
There's only 3 THREADS of aluminum holding each plug in. It's not hard to strip them out.

12-14ft-lb and no more than that.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130385
06/10/19 02:50 PM
06/10/19 02:50 PM
Joined: Apr 2008
Posts: 13,346
Central NY
Miller88 Offline
Miller88  Offline

Joined: Apr 2008
Posts: 13,346
Central NY
For some reason I recall mine being tightened to 20. 1997 F150 5.4


18 Forester 2.5I 6M
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Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130400
06/10/19 02:56 PM
06/10/19 02:56 PM
Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
In that range you are getting into lb-in if you need any sort of real accuracy and you do which eliminates most 3/8 tools.
If you use never seize the number will be even lower, hand slightly firmer than snug and call it good. In my experience (not that I am a big Ford guy, far from it) they seem to let go more when tightened to the spec after changing them.


ASE L1, Master. Deutsch Meisterbrief.
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130450
06/10/19 03:43 PM
06/10/19 03:43 PM
Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline

Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
Originally Posted by Fitz98

Originally Posted by bdcardinal
From the FSM 16-20Nm or 12-14ft-lb

So there was no TSB to prevent spitting plugs out of head?


Just about repairing the head after they blow out. Which according to Ford, they wanted you to put a new head on.

Here is a video from Ford Tech Makuloco https://www.youtube.com/watch?v=kc4-z-sT1ms


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130466
06/10/19 03:53 PM
06/10/19 03:53 PM
Joined: Aug 2006
Posts: 10,015
Central Washington
Colt45ws Offline
Colt45ws  Offline

Joined: Aug 2006
Posts: 10,015
Central Washington
There is a site out there that advises using some rediculous high torque on the plugs but I think thats a bad ida. Ive done a little research and Ive found 20-25ft lbs is doable on 4 thread heads. On the newer 8 thread heads I just go straight to 25ft lbs and dont even think about it. They dont loosen after that.
I popped 2 plugs on my 2002 and both times it was because the plugs had loosened until they blew out. Ive done some other mod motor vehicles and often find at least one spark plug loose and coated in the brown-orange soot from the gasses escaping up the threads.
imo 10ft lbs is too little torque to prevent loosening and backing out over time. If you want to be really safe torque to factory 10ftlbs and then go back and retorque every 10-20k

Last edited by Colt45ws; 06/10/19 03:57 PM.

-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 86k
Pennzoil Conv HM 5W30, Fram XG2
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5130480
06/10/19 04:12 PM
06/10/19 04:12 PM
Joined: Mar 2011
Posts: 433
Florida
Fitz98 Offline OP
Fitz98  Offline OP

Joined: Mar 2011
Posts: 433
Florida
I was also thinking about the anti-seize. It does just what it says, prevents the different metals from seizing, but can't help but wonder if that contributes to plugs loosening and blowing out.
Perhaps it is more due to dissimilar metals without anti-seize causing galvanic corrosion on the aluminum heads, weakening the aluminum threads.

Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5131071
06/11/19 06:54 AM
06/11/19 06:54 AM
Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,935
MA, Mittelfranken.de
The problem with these is not anti seize or anything else its the 3 threads that is the root issue that even when new were weak, it is just bad engineering. Now you get to repair their mistakes, course engineers know best right. LOL


ASE L1, Master. Deutsch Meisterbrief.
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5131174
06/11/19 09:06 AM
06/11/19 09:06 AM
Joined: Jan 2013
Posts: 2,876
Texas
WyrTwister Offline
WyrTwister  Offline

Joined: Jan 2013
Posts: 2,876
Texas
You would think some one would have filled a class action against Ford ?


Wyr
God bless
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Trav] #5131234
06/11/19 10:18 AM
06/11/19 10:18 AM
Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline

Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
Originally Posted by Trav
The problem with these is not anti seize or anything else its the 3 threads that is the root issue that even when new were weak, it is just bad engineering. Now you get to repair their mistakes, course engineers know best right. LOL


I would say that now is the perfect time to repair every cylinder if the OP plans on keeping the vehicle long term.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Fitz98] #5131259
06/11/19 10:47 AM
06/11/19 10:47 AM
Joined: May 2003
Posts: 7,545
Oklahoma
Schmoe Offline
Schmoe  Offline

Joined: May 2003
Posts: 7,545
Oklahoma
Ford days it's a spark plug problem, not a head problem.


01 Supercrew Lariat 4X4
06 Accord EX-L V6
14 CRV EX-L (RIP) 2018 CRV EX-L
Re: 98 Expedition - Spark Plug Torque to prevent spitting plugs [Re: Schmoe] #5131343
06/11/19 12:02 PM
06/11/19 12:02 PM
Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline

Joined: Jun 2005
Posts: 12,549
Santa Barbara, CA
Originally Posted by Schmoe
Ford days it's a spark plug problem, not a head problem.


Well I believe that when my poo turns purple and smells like rainbow sherbet.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
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