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Old 05-23-2016, 05:26 PM   #1
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Clarify Spark Plug Torque

I know the 4.6 is prone to blowing plugs out of the head. I have seen it happen twice. Before long I am going to need to replace my plugs.

I am hearing that the correct torque spec is about 11-12 in lbs. I have to admit that I am baffled by that. I have a micro sized 1/4 torque wrench that only drops to 20 in lbs. How would one even try to measure 11 in lbs? I can't find a torque wrench that drops below 20 in lbs.

There is no way those 4 aluminum threads are going to take 11 ft lbs of torque.

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Old 05-23-2016, 11:44 PM   #2
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I torqued mine to 12 and no problems so far. Last time i torqued to 15 and I blew a plug out. Sad life

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Old 05-24-2016, 12:13 AM   #3
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Originally Posted by Revvv View Post
I know the 4.6 is prone to blowing plugs out of the head. I have seen it happen twice. Before long I am going to need to replace my plugs.

I am hearing that the correct torque spec is about 11-12 in lbs. I have to admit that I am baffled by that. I have a micro sized 1/4 torque wrench that only drops to 20 in lbs. How would one even try to measure 11 in lbs? I can't find a torque wrench that drops below 20 in lbs.

There is no way those 4 aluminum threads are going to take 11 ft lbs of torque.

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The correct torque is 11-12 ft-lbs. 11-12in-lbs would be less than finger tight and I can only imagine how quickly those plugs would back out.
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Old 05-24-2016, 12:55 AM   #4
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The correct special is 11-12 ft-lbs. 11-12in-lbs would be less than finger tight and I can only imagine how quickly those plugs would back out.
This is the answer I needed and the reason I asked.

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Old 05-24-2016, 09:30 AM   #5
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Actually the factory spec is 12-15 ft lbs WITH ANTISEIZE.
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Old 05-24-2016, 09:45 AM   #6
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Actually the factory spec is 12-15 ft lbs WITH ANTISEIZE.
I would never install plugs without antiseize. Aluminum likes to latch onto steel.

I just helped a friend change the plugs in his F-150. PB blaster was sprayed on the plugs and allowed to sit for an hour. We still had a plug break off at the nut and leave the threaded body in the cylinder. Luckily the porcelain came out whole with the plug top, we only had to fight with extracting the threaded portion.

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Old 05-24-2016, 11:48 AM   #7
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I would never install plugs without antiseize. Aluminum likes to latch onto steel.

I just helped a friend change the plugs in his F-150. PB blaster was sprayed on the plugs and allowed to sit for an hour. We still had a plug break off at the nut and leave the threaded body in the cylinder. Luckily the porcelain came out whole with the plug top, we only had to fight with extracting the threaded portion.

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That sounds like a barrel of fun

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Old 05-24-2016, 12:51 PM   #8
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Yup use antiseize for sure. But I did torque mine to 12 with antiseize and so far no problems.

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Old 05-24-2016, 01:23 PM   #9
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That sounds like a barrel of fun

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Typical 3V. Don't even get me started on the phaser issues the early ones had... Father found out the hard way.

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Old 05-24-2016, 01:37 PM   #10
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As I am to understand, they did go to an 8 thread plug in the 04 GT'S. Even then I still torque them to spec and use anti seize. I've heard horror stories of plugs blowing out and don't feel the overwhelming desire to experience it myself.

I thought I read somewhere with the 4.6 trucks having plugs breaking off when replacing them, and Ford telling people "tough luck". That sounds like a good time too.

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Old 05-24-2016, 02:13 PM   #11
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As I am to understand, they did go to an 8 thread plug in the 04 GT'S. Even then I still torque them to spec and use anti seize. I've heard horror stories of plugs blowing out and don't feel the overwhelming desire to experience it myself.

I thought I read somewhere with the 4.6 trucks having plugs breaking off when replacing them, and Ford telling people "tough luck". That sounds like a good time too.

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Correct on both counts. The 3V had really stupid designed plugs when it came out. And changing them is a ***** even with updates plugs that don't break.

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Old 05-24-2016, 02:14 PM   #12
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That sounds like a barrel of fun

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It was more fun than I wanted to have.

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