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Time-Sert 4212H 5.4 Ford Spark Plug Thread Repair M12x1.25

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2.00 LBS
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The 4212H Time Sert thread repair kit is designed to be used for the late production 2008 and newer Ford 3 valve heads which use a 12x1.25mm taper seat spark plug. It is also used on some Ford Fusion and Escapes that have a 1.5 Liter engine and use M12x1.25 spark plugs. Partial listing below. *Make sure you have M12x1.25 and it's a first time repair. This is not an oversize kit so if a previous repair was made and failed do not use this kit. Currently there is no "oversized" repair for the M12x1.25 Taper Seat plug.

Kit Includes: 

 Seat cutter 
 Install driver 
 5 Inserts PN 42126   Accepts original Spark Plug (O.D. Outside Diameter is .53")
 Thread Sealer 


 4.6 or 5.4 for these below. *Make sure the spark plug is M12x1.25.

MakeModelYear Range
Ford Mustang 2008 - 2010
Ford Expedition 2011 - 2014
Ford Expedition EL 2009 - 2010
Ford Expedition Max 2009 - 2010
Ford Explorer 2008 - 2010
Ford Explorer Sport Trac 2008 - 2010
Ford F150 1/2 Ton - Pickup 2008 - 2010
Ford F250 Super Duty 3/4 Ton - Pickup 2008 - 2010
Ford F350 Super Duty 1 Ton - Pickup 2008 - 2010
Ford F450 Super Duty 1 1/2 Ton Truck 2008 - 2008
Ford F450 Super Duty 1 1/2 Ton Truck 2011 - 2014
Ford F53 2008 - 2009
Ford F53 2011 - 2014
Ford F550 Super Duty 2008 - 2014
Ford F650 Super Duty 2012 - 2013
Lincoln Aviator 2005 - 2005
Lincoln Mark LT 2008 - 2008
Lincoln Mark LT 2010 - 2010
Lincoln Navigator 2011 - 2014
Lincoln Navigator L 2008 - 2009
Mercury Mountaineer 2008 - 2010


 Ford 1.5 Engines *Make sure the spark plug is M12x1.25.

MakeModelYear Range
Ford Fusion 2014 -2018
Ford Escape 2017 -2019
Ford Fusion 2020 -2020


Various size engines in the ones below, the Fords are mostly 5.0.

*Make sure the spark plug is M12x1.25. 

MakeModelYear Range
Cadillac ATS 2016 -2019
Cadillac CTS 2014 -2019
Ford GT 2017 -2019
Ford Mustang 2018 -2021
Lincoln MKZ 2017 -2020
Ford Fusion 2017 -2019
Cadillac XTS 2014 -2019
Ford Edge 2015 -2019
Lincoln Continental 2017 -2019
Ford F150 1/2 Ton - Pickup 2015 -2021
Lincoln Nautilus 2019 -2019
Lincoln MKX 2016 -2018
Ford E350 Super Duty 1 Ton 2021 -2021
Ford F250 Super Duty 3/4 Ton - Pickup 2020 -2021
Ford F350 Super Duty 1 Ton - Pickup 2020 -2021

Question: I have a 2009 f150 4.6 3 valve. I think I need the 4212H time sert. I have watched their video but can't figure out how to insure I stop the cutting edge at 1/4 because I can't see down in the spark plug well. Do you have any tips? Also does piston down valves closed need to be performed when doing the 4.6 3 valve?

Answer: You could mark the tap with a crayon or wrap with paper tape and check frequently by removing and seeing how far down it had reached. The valves do need to be closed and piston down enough not to be hit by tooling. An easier way to determine valves are closed without removing the valve cover is to use the 389-4000 Cylinder Leak Tester.


Mouse over the images above for a more detailed view of the kit components. Also notice our bulk discount prices on TIME-SERT replacement inserts for thread repair kits. Need more information on TIME-SERT thread repair kits? Visit our auto repair blog section on thread repair kits for tips, advice and all your thread repair questions answered. Just comment and we will be quick to respond.

See the pdficon-small.png TIME-SERT products pdf for more information on thread repair kits and inserts. Some are listed for certain applications on cars, trucks and motorcycles. The pdf is a partial application list so feel free to email or call if we can assist with your particular need. We also accept inquiries regarding our daily TIME-SERT specials. Remember TIME-SERT is recommended by leading car manufacturers like the General Motors Corporation. In fact TIME-SERT is GM's only authorized repair for head bolt threads.

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1 Review

  • 5
    You can do it!

    Super easy process and the tool is amazing quality! Extremely pleased I found Time-Sert!

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