How to service the spark plugs on 5.4L (3V) or 6.8L (3V) engines on Ford F-350 Super Duty?

Vehicle owners should start ignition coil-on-plug removal before servicing 5.4L (3V) or 6.8L (3V) engine spark plugs. The correct procedure requires engine temperature control to be warm to touch after cooling before attempting any spark plug service to prevent damage to threads or the cylinder head. Hand tools should be the only tools used for both removing and installing spark plugs due to their ability to protect the cylinder head and spark plug from damage. The first step in removal involves cleaning foreign material from the spark plug well with compressed air. When using original spark plugs once again they should return to their original cylinder installation position while new spark plugs can be inserted anywhere. Early build vehicles require spark plugs to be tightened to 34 Nm (25 lb-ft) yet late build vehicles need them tightened to 12 Nm (9 lb-ft). The spark plug gap remains unadjustable thus requiring replacement of the spark plug with new ones when out of specification. The inspection should be followed by new spark plug installations according to the reverse order of the removal process.

OEM Ford F-350 Super Duty Spark Plug

Ignition Spark Plug

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8 Spark Plugs found

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Ford F-350 Super Duty Spark Plug
Part Number: PZK-1F
$10.25 MSRP: $20.73
You Save: $10.48 (51%)
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Product Specifications
- Replaced by: PZK-1F-X
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Ford F-350 Super Duty | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 10 Cyl 6.8 L GAS, 8 Cyl 5.4 L GAS
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Ford F-350 Super Duty Spark Plug
Part Number: CYFS-12Y-T6
$5.39 MSRP: $8.35
You Save: $2.96 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: CYFS-12Y-T5, CYFS-12F-5X, SP-586, BR3Z-12405-A, CYFS-O92-FT, CYFS-12F-5, SP-520, SP-520-X
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2020-2024 Ford F-350 Super Duty | King Ranch, Lariat, Platinum, XL, XLT | 8 Cyl 6.8 L GAS, 8 Cyl 7.3 L GAS
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Ford F-350 Super Duty Spark Plug
Part Number: AGSF-22W-MX
$5.08 MSRP: $8.25
You Save: $3.17 (39%)
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Product Specifications
- Replaces: AGSF-22W-M, SP-479, AGSF-22W-
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1999-2007 Ford F-350 Super Duty | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 10 Cyl 6.8 L GAS, 8 Cyl 5.4 L GAS
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Ford F-350 Super Duty Spark Plug
Part Number: HJFS-24FP-X
$9.73 MSRP: $15.06
You Save: $5.33 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: SP-509, HJFS-24FP
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2010 Ford F-350 Super Duty | Cabela's, FX4, Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 10 Cyl 6.8 L GAS, 8 Cyl 5.4 L GAS
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Ford F-350 Super Duty Spark Plug
Part Number: MC3Z-12A342-F
$13.74 MSRP: $21.82
You Save: $8.08 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: ZD-11, F4TZ-12A342-A, F4TZ-12A342-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1999-2003 Ford F-350 Super Duty | King Ranch, Lariat, XL, XLT | 8 Cyl 7.3 L DIESEL
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Ford F-350 Super Duty Spark Plug
Part Number: 4C3Z-12A342-A
$18.33 MSRP: $28.36
You Save: $10.03 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: 4C3Z-12A342-AA, 4C3Z-12A342-A2, ZD-13-A2, ZD-13
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2004-2007 Ford F-350 Super Duty | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
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Ford F-350 Super Duty Spark Plug
Part Number: 3C3Z-12A342-A
$9.39 MSRP: $14.91
You Save: $5.52 (38%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Glow Plug; Diesel Glow Plug
- Replaces: ZD-12, 3C3Z-12A342-AA2, 3C3Z-12A342-AA, ZD-12-2
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2004 Ford F-350 Super Duty | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 8 Cyl 6.0 L DIESEL
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Ford F-350 Super Duty Spark Plug
Part Number: CYFS-12-FPX
$8.74 MSRP: $13.53
You Save: $4.79 (36%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: SP-513, CYFS-092FP, CYFS-12-FP, SP-526
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2011-2022 Ford F-350 Super Duty | King Ranch, Lariat, Platinum, XL, XLT | 8 Cyl 6.2 L FLEX

Ford F-350 Super Duty Spark Plug

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Ford F-350 Super Duty Spark Plug Parts Questions & Experts Answers

Spark Plug
HJFS-24FP-X
Q: How to service the spark plugs on 5.4L (3V) or 6.8L (3V) engines on Ford F-350 Super Duty?
A: Vehicle owners should start ignition coil-on-plug removal before servicing 5.4L (3V) or 6.8L (3V) engine spark plugs. The correct procedure requires engine temperature control to be warm to touch after cooling before attempting any spark plug service to prevent damage to threads or the cylinder head. Hand tools should be the only tools used for both removing and installing spark plugs due to their ability to protect the cylinder head and spark plug from damage. The first step in removal involves cleaning foreign material from the spark plug well with compressed air. When using original spark plugs once again they should return to their original cylinder installation position while new spark plugs can be inserted anywhere. Early build vehicles require spark plugs to be tightened to 34 Nm (25 lb-ft) yet late build vehicles need them tightened to 12 Nm (9 lb-ft). The spark plug gap remains unadjustable thus requiring replacement of the spark plug with new ones when out of specification. The inspection should be followed by new spark plug installations according to the reverse order of the removal process.