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Spark Plug Torque specifications.

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Old 10-17-2008, 03:50 PM
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Default Spark Plug Torque specifications.
Does anyone know what the torque specifications are on spark plugs for the JK?
Thanks in advance.
I'm thinking of changing th OE's to NGK iridiums. Product Number LZTR5AIX13
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Old 10-17-2008, 05:28 PM
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Anybody..................:
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Old 10-17-2008, 06:10 PM
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Dumb question I know but just to confirm the head on the JK's are aluminum, yes?
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Old 10-17-2008, 06:23 PM
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From the service manual... The chart is hard to read here... But it's 13 ft/lbs. Coat the threads with anti-seize.

Code:
TORQUE

DESCRIPTION 
  N·m 
  Ft. Lbs. 
  In. Lbs. 
  
Camshaft Sensor Mounting Bolt — 3.8L V-6 Gas
  14.1
  -
  125
  
Camshaft Sensor Mounting Bolt — 2.8L Diesel
  11
  8
  97
  
Ignition coil bolts — 3.8L V-6 Gas
  11.8
  -
  105
  
Spark Plugs — 3.8L V-6 Gas
  17.5
  13
  -
  
Glow Plugs — 2.8L Diesel
  14
  10
  124
  
Knock Sensor — 3.8L V-6 Gas
  10
  7
  -
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Old 10-17-2008, 06:29 PM
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Originally Posted by Doc_D
From the service manual... The chart is hard to read here... But it's 13 ft/lbs. Coat the threads with anti-seize.

Code:
TORQUE

DESCRIPTION 
  N·m 
  Ft. Lbs. 
  In. Lbs. 
  
Camshaft Sensor Mounting Bolt — 3.8L V-6 Gas
  14.1
  -
  125
  
Camshaft Sensor Mounting Bolt — 2.8L Diesel
  11
  8
  97
  
Ignition coil bolts — 3.8L V-6 Gas
  11.8
  -
  105
  
Spark Plugs — 3.8L V-6 Gas
  17.5
  13
  -
  
Glow Plugs — 2.8L Diesel
  14
  10
  124
  
Knock Sensor — 3.8L V-6 Gas
  10
  7
  -

What does the 17.5 number mean above the 13? 13? That doesn't sound right? Are the spark plugs 12mm?
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Old 10-17-2008, 07:12 PM
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Originally Posted by USAntigoon
The service manual spec of 13 ft/lbs is in line with the NGK recommendations for a 12 mm flat seat in alu head..
p.s the 17.5 number above the 13 is the spec in Newton-Meter.

Hope this helps you..

p.s 1 ft/lbs = 1.35 Nm
So the spark plugs for the Jk are 12mm?
Thanks in advance for the info.
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Old 10-18-2008, 02:10 AM
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DO NOT attempt to change the plugs in a aluminum head until the engine is COOL. You don't want to pull the threads out of the aluminum heads.....
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Old 10-18-2008, 06:13 AM
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Originally Posted by TINMAN080
DO NOT attempt to change the plugs in a aluminum head until the engine is COOL. You don't want to pull the threads out of the aluminum heads.....
Thanks TINMAN080, great advice!
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Old 10-18-2008, 07:48 PM
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Has anyone changed out there OE champion plugs to iridium yet?
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Old 10-18-2008, 07:57 PM
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Yall need to remember also, slob a liberal amount of anti-seize on the spark plug threads too.
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